KR100566653B1 - The middle point part continuous structure and the continuous method of prestressed concrete girder bridge - Google Patents

Abstract

In the present invention, regardless of the span length of the bridge, it is possible to continue the middle point of the bridge, the sole plate is provided to resist the bearing pressure stress of the bridge, and the upper slab is provided with PC steel to provide rigidity It is an object of the present invention to provide a continuity structure and a continuity method of the mid-point of the prestressed concrete girder bridge to be enlarged.

The middle point continuity structure of the prestressed concrete girder bridge according to the present invention for achieving the above object is a PSC beam consisting of upper and lower flanges and the abdomen; A host anchorage fixture fixed to a plurality of host wires in a central portion of both sides of the PSC beam; A multi-purpose external protrusion fixing block installed at both sides of the PSC beam with a predetermined width and width and having a wedge-shaped protrusion formed at each corner thereof; A continuous connection steel plate having a shear connection member welded to a surface thereof while being installed for continuation of a unit PSC beam having a predetermined size at one end of an upper flange of the PSC beam; A continuous connection cover steel plate which is disposed on the upper and lower surfaces of the continuous connection steel sheet and is fixed by high tension bolt fastening; It is fixed to the lower flange of the PSC beam, characterized in that consisting of a sole plate attached to the shear connector on the surface.

In addition, the middle point continuity method of the prestressed concrete girder bridge according to the present invention for achieving the above object comprises the steps of (I) assembling the reinforcing bar to form a PSC beam; Attaching the multi-purpose external protrusion fixing block on both sides of the assembled reinforcing beam, connecting the host steel wire while installing the host fixing device at predetermined positions at both ends of the mold, and continuous up and down fixing unit for the continuity at the upper end of the multi-purpose external protrusion fixing block And connecting the continuous steel wire and the continuous steel wire while installing the continuous maintenance fixing device, and installing the central maintenance fixing device and the secondary tension fixing device at the lower end of the multi-purpose external protrusion fixing block, Connecting the secondary tensile steel wire and the continuous connection steel plate having a constant length at one end of the upper flange of the PSC beam, and then casting and curing the concrete to produce the PSC beam and firstly tensioning (II); The fabricated PSC beams are installed on the piers and shifts, and in the middle of the piers, the continuous coupling plates are installed in the upper flange to connect the adjacent PSC beams and the PSC beams, and the continuous coupling cover steel plates and high tension bolts are installed. Step (III); Filling the sequential connection part with concrete and contacting each other at the sides of the PSC beam and the PSC beam by injecting epoxy or filling non-condensed mortar to close the finishing part (IV); Slab is formed by placing concrete on top of the PSC beam after applying the tensioning force to the continuous steel wire connected to the sequential anchorage in the upper end of the multi-purpose externally projected anchoring block attached to both sides of the PSC beam. (V) doing; After the slab is formed, introducing a tension force into a secondary tensile wire connected to a secondary tension anchor at a lower end of the multi-purpose externally projected anchoring block to perform secondary tension of the PSC beam (VI); It is characterized by consisting of a step (Ⅶ) of the continuous secondary tension by introducing a tension force to the continuous maintenance steel wire connected to the continuous maintenance anchorage.

Prestressed concrete girder bridge, middle point, continuous

Description

The middle point part continuous structure and the continuous method of prestressed concrete girder bridge}

1 is a schematic view showing a state in which the short span type sequencing of the prestressed concrete girder bridge installed in one of the bridge apparatus according to the present invention,

FIG. 2 is an enlarged detailed view of portion “A” of FIG. 1;

3 is a cross-sectional view showing the point portion of FIG.

4 is a cross-sectional view showing the end of FIG.

FIG. 5 is an enlarged detailed view of portion “B” of FIG. 1;

6 is a cross-sectional view showing the end point portion of FIG.

7 is a cross-sectional view showing a central portion of FIG. 5;

8 is a schematic view showing a state in which the short span type sequencing of the prestressed concrete girder bridge installed on the two bridge apparatus according to the present invention is applied,

9 is an enlarged detailed view of a portion “A” of FIG. 8;

FIG. 10 is a cross-sectional view of a branch of FIG. 8;

11 is a sectional view of the end of FIG. 8;

FIG. 12 is an enlarged detailed view of a portion “B” of FIG. 8;

13 is a cross-sectional view showing the end point portion of FIG.

14 is a cross-sectional view showing a central portion of FIG. 12;

Figure 15 is a schematic diagram showing the continuum between the prestressed concrete girder bridge installed on one of the bridge device according to the present invention,

FIG. 16 is an enlarged detailed view of a portion “A” of FIG. 15;

Figure 17 is a schematic diagram showing the continuum structure between the prestressed concrete girder bridge installed on two bridge devices according to the present invention,

FIG. 18 is an enlarged detailed view of a portion “A” of FIG. 17;

19 is a perspective view showing the sole plate of the intermediate point continuity structure of the prestressed concrete girder bridge according to the present invention,

20 is an exemplary view showing a state where the sole plate of the middle point continuity structure of the prestressed concrete girder bridge according to the present invention is installed at the end of the PSC beam,

FIG. 21 is a perspective view illustrating a sole plate connecting steel sheet having a middle point continuous structure of a prestressed concrete girder bridge according to the present invention; FIG.

Figure 22 is an exemplary view showing a state in which the sole plate connecting steel plate of the middle point continuity structure of the prestressed concrete girder bridge according to the present invention is installed at the end of the PSC beam.

Explanation of symbols on the main parts of the drawing

10: PSC beam 12: upper flange

14: lower flange 16: abdomen

20: Host Settlement 22: Host Liner

30: multi-purpose external protrusion fixing block 32: protrusion

40: continuous connecting steel sheet 42: shear connector

50: continuous connecting cover steel plate 52: high tension bolt

60: sole plate 61a: horizontal plate

61b: vertical plate 62: shear connector

64: sol plate connection steel plate 65: horizontal plate

66: protrusion 67: vertical plate

68: shear connector 72: continuous steel wire

74: Steel wire for continuous maintenance 76: Continuous anchorage

78: anchorage for continuous maintenance 80: steel wire for central maintenance

82: central maintenance anchor 84: secondary tensile steel wire

86: secondary tension anchor 90: stapling device

100: pier 110: shift

120: continuous connection B: prestressed concrete girder bridge

The present invention relates to a continuum structure and a method of continuity of the middle point of a prestressed concrete girder bridge, and in particular, the middle point of the bridge can be continuous regardless of the span length of the bridge, and the sole plate is to resist the bearing stress of the bridge. And the upper slab is provided with a PC steel material to the middle point portion continuity structure of the prestressed concrete girder bridge to increase the stiffness of the middle point portion and the method of continuity.

In general, the middle point continuity method of prestressed concrete beams (hereinafter referred to as "PSC beams") can be largely divided into a flexible connection method and a rigid connection method.

First, the PSC beam flexible connection method of electrons has a styrofoam or rubber plate on the top of the PSC beam and the PSC beam, the slab is continuous on it, and a crack induction joint is placed on the upper part of the intermediate point, so that the space between the PSC beam and the PSC beam is emptied. Put it.

This PSC beam flexible connection method is a concept that only the slab is constructed in succession to reduce only the expansion joint.

On the other hand, the latter PSC beam rigid connection method is a slab continuous, filled with reinforced or reinforced concrete between the PSC beam and the PSC beam to form a continuous, TRB (Transportation Research Board) method, PCA (Portland Cement Association) Or a method of reinforcing a slab or a PSC beam at an intermediate point portion with a steel wire or a steel bar.

Here, the TRB method is the AASHTO standard method, which is currently used mainly in Korea, and the PCA method is the same as the TRB method, but a hook reinforcing bar is added to resist the static moment occurring at the bottom of the PSC beam when the mid-point is continuous. Although this method is more effective than the TRB method, it is not currently used well due to the inconvenience of hook rebar construction due to its effect.

Here, since neither TRB method nor PCA method inevitably occurs cracks in the continuous part after construction, it is not a completely continuous method of the intermediate point part.

That is, the PSC beam and the PSC beam are separated due to the through cracks in the continuous portion of the intermediate point, and thus there is a problem in that the PSC beam behaves as a simple beam instead of a continuous beam.

Accordingly, the present invention has been made to solve the problems described above, regardless of the span length of the bridge, it is possible to continue the middle point of the bridge, the sole plate to resist the bearing pressure stress of the bridge The purpose of the present invention is to provide a continuous structure and a continuous method of the intermediate point portion of the prestressed concrete girder bridge, in which the upper slab is provided with PC steel to increase the rigidity of the intermediate point portion.

The middle point continuity structure of the prestressed concrete girder bridge according to the present invention for achieving the above object is a PSC beam consisting of upper and lower flanges and the abdomen; A host anchorage fixture fixed to a plurality of host wires in a central portion of both sides of the PSC beam; A multi-purpose external protrusion fixing block installed at both sides of the PSC beam with a predetermined width and width and having a wedge-shaped protrusion formed at each corner thereof; A continuous connection steel plate having a shear connection member welded to a surface thereof while being installed for continuation of a unit PSC beam having a predetermined size at one end of an upper flange of the PSC beam; A continuous connection cover steel plate which is disposed on the upper and lower surfaces of the continuous connection steel sheet and is fixed by high tension bolt fastening; It is fixed to the lower flange of the PSC beam, characterized in that consisting of a sole plate attached to the shear connector is welded on the surface.

In addition, the middle point continuity method of the prestressed concrete girder bridge according to the present invention for achieving the above object comprises the steps of (I) assembling the reinforcing bar to form a PSC beam; Attaching the multi-purpose external protrusion fixing block on both sides of the assembled reinforcing beam, connecting the host steel wire while installing the host fixing device at predetermined positions at both ends of the mold, and continuous up and down fixing unit for the continuity at the upper end of the multi-purpose external protrusion fixing block And connecting the continuous steel wire and the continuous steel wire while installing the continuous maintenance fixing device, and installing the central maintenance fixing device and the secondary tension fixing device at the lower end of the multi-purpose external protrusion fixing block, Connecting the secondary tensile steel wire and the continuous connection steel plate having a constant length at one end of the upper flange of the PSC beam, and then casting and curing the concrete to produce the PSC beam and firstly tensioning (II); The fabricated PSC beams are installed on the piers and shifts, and in the middle of the piers, the continuous coupling plates are installed in the upper flange to connect the adjacent PSC beams and the PSC beams, and the continuous coupling cover steel plates and high tension bolts are installed. Step (III); Filling the sequential connection part with concrete and contacting each other at the sides of the PSC beam and the PSC beam by injecting epoxy or filling non-condensed mortar to close the finishing part (IV); Slab is formed by placing concrete on top of the PSC beam after applying the tensioning force to the continuous steel wire connected to the sequential anchorage in the upper end of the multi-purpose externally projected anchoring block attached to both sides of the PSC beam. (V) doing; After the slab is formed, introducing a tension force to a secondary tensile wire connected to a secondary tension anchor at a lower end of the multi-purpose externally projected anchoring block to perform secondary tension of the PSC beam (VI); It is characterized by consisting of a step (Ⅶ) of the continuous secondary tension by introducing a tension force to the continuous maintenance steel wire connected to the continuous maintenance anchorage.

Hereinafter, with reference to the accompanying drawings, the present invention will be described in detail.

1 is a schematic view showing a state in which a short span sequential continuation of the prestressed concrete girder bridge installed in one of the bridge device according to the present invention is applied, Figure 2 is a detailed view showing an enlarged portion "A" of Figure 1, Figure 3 1 is a cross-sectional view showing a point portion of FIG. 1, FIG. 4 is a cross-sectional view showing the end portion of FIG. 1, FIG. 5 is a detailed view showing a portion "B" of FIG. 1, and FIG. 7 is a cross-sectional view showing a central portion of FIG. 5, FIG. 8 is a schematic view showing a state in which the short span type sequencing of the prestressed concrete girder bridge is installed on two bridge devices according to the present invention. 8 is an enlarged detailed view of a portion “A” of FIG. 8, FIG. 10 is a cross-sectional view illustrating a point portion of FIG. 8, FIG. 11 is a cross-sectional view illustrating an end portion of FIG. 8, and FIG. 12 is a “B” of FIG. 8. Detail view of a portion enlarged, and FIG. Fig. 14 is a cross-sectional view showing the central portion of the end point, Fig. 14 is a cross-sectional view showing the central portion of Fig. 12, Fig. 15 is a schematic diagram showing the continuity between the prestressed concrete girder bridge installed in one of the bridge device according to the present invention, Fig. 16 15 is an enlarged detailed view of part "A" of FIG. 15, and FIG. 17 is a schematic view illustrating a continuum structure of all prestressed concrete girder bridges installed in two bridge devices according to the present invention, and FIG. 18 is "A" of FIG. "Is a detailed view showing an enlarged portion, Figure 19 is a perspective view showing a sole plate of the continuous structure of the intermediate point portion of the prestressed concrete girder bridge according to the present invention, Figure 20 is a middle point of the prestressed concrete girder bridge according to the present invention FIG. 21 is an exemplary view showing a state in which a sole plate having a sub-continuous structure is installed at an end portion of a PSC beam, and FIG. 21 is a prestress cone according to the present invention. FIG. 22 is a perspective view illustrating a sol plate connecting steel plate having a middle point continuous structure of a litter girder bridge, and FIG. 22 illustrates a state where the sol plate connecting steel sheet of the middle point continuous structure of a prestressed concrete girder bridge is installed at an end of a PSC beam. Illustrated illustration.

As shown in these figures, the intermediate point continuous structure of the prestressed concrete girder bridge according to the present invention comprises: a PSC beam 10 composed of upper and lower flanges 12 and 14 and an abdomen 16; A host holder fixing unit 20 in which a plurality of holders are fixed to fix the host steel wire 22 at the central portions of both side ends of the PSC beam 10;

A multi-purpose external protrusion fixing block 30 installed at both sides of the PSC beam 10 at a predetermined width and width and having a wedge-shaped protrusion 32 formed at each corner thereof; A continuous connection steel plate 40 having a shear connector 42 welded to a surface thereof while being installed for continuation of a unit PSC beam 10 having a predetermined size at one end of the upper flange 12 of the PSC beam 10; A continuous connection cover steel plate 50 disposed on the upper and lower surfaces of the continuous connection steel plate 40 and fixedly installed by fastening high tension bolts 52; It is fixed to the lower flange 12 of the PSC beam 10, the shear connector 62 is composed of a sole plate 60 is welded to the surface.

Here, the multi-purpose external protrusion fixing block 30 is protrudingly installed on both sides of both ends of the PSC beam 10, and is installed in the upper and lower portions of the multi-purpose external protrusion fixing block 30 for continuity, respectively. 72) and a sequential fixing unit 76 and a sequential maintenance fixing unit 78 fixed to the sequential maintenance steel wire 74; A central portion maintenance fixing fixture 82 of the PSC beam 10 installed at the lower end of the multi-purpose external protrusion fixing block 30 and having a central portion maintenance steel wire 80 fixed thereto; The secondary tension steel wire 84 is fixedly installed under the central part maintenance fixing unit 82, and the secondary tension fixing unit 86 is fixedly installed.

In particular, the multi-purpose external protrusion fixing block 30 is composed of any one of a structural form of reinforced concrete structure, steel structure, steel composite structure.

In addition, the multi-purpose external protrusion fixing block 30 is at least one structure attached to both sides of the PSC beam (10).

And the multi-purpose external protrusion fixing block 30 is formed in any one of the cross-sectional shape of the lozenge, trapezoid, rectangle, triangle, polygon, parallelogram, isometric trapezoid, isosceles trapezoid, easily in various other shapes Note that it can be changed and used.

Here, the multi-purpose external protrusion fixing block 30 is a structure in which wedge-shaped protrusions are integrally added to each corner.

That is, the multi-purpose external protrusion fixing block 30 has a lozenge, trapezoid, quadrangle, and triangular shape as a basic shape, and fixing and steel wires 72, 76, 80 of the fixing holes 76, 78, 82, and 86 in the basic shape. 84) Wedge-shaped protrusions 32 are selectively added to each corner portion to maintain structural rigidity in tension.

On the other hand, the sole plate 60 is fixedly installed over the back surface of the lower flange 14 of the PSC beam 10 on one side and the PSC beam 10 on the other side, the pedestal device 90 below the sole plate 60 ) Is a fixed structure.

Here, the sol plate 60 is installed in a portion of the PSC beam 10 in contact with the one device 90 is effective to reinforce the lower portion of the PSC beam (10).

In addition, the sole plate 60 is fixed to the rear flange 14 of the PSC beam 10 on one side and the lower flange 14 of the PSC beam 10 on the other side, respectively, the sole plate 60 of the PSC beam 10 on the side ) And the sole plate connecting steel plate 64 is fixedly installed to connect and fix the sole plate 60 of the PSC beam 10 of the other side to each other. It is a fixed installed structure.

Here, the sol plate 60 is attached to the lower portion of each PSC beam 10, and the sol plate 60 is connected to each other by a sol plate connecting steel plate 64, the lower portion of each sol plate 60 Each of the teaching device 90 is fixedly installed in the lower portion of the PSC beam 10, thereby reinforcing the lower portion of the PSC beam 10.

In particular, the sole plate 60 is made of an L shape as a whole, the shear connector 62 is welded to the surface is made of a structure, the sole plate 60 is a horizontal plate (61a) consisting of a rectangular plate and the number It consists of the horizontal board 61b which is extended by the right angle to the flat plate 61a, and has the expansion width extended with respect to the width of the horizontal board 61a.

In addition, the sole plate connecting steel plate 64 is a horizontal plate 65 made of a rectangular plate shape; A protrusion 66 formed at the center of the horizontal plate 65 at a predetermined width and height; It consists of a vertical plate (67) which is a pair is welded and installed at regular intervals vertically on the protrusion (66), the shear connecting member 68 to the horizontal plate 65, the protrusion 66 and the vertical plate 67, respectively ) Is a welded structure.

The method of continuation of the intermediate point portion of the prestressed concrete girder bridge according to the present invention having the configuration as described above comprises the steps of: (I) assembling the reinforcing bars to form the PSC beam 10; Attaching the multi-purpose external protrusion fixing block 30 on both sides of the assembled reinforcing beam, connecting the host steel wire 22 while installing the host fixing unit 20 at predetermined positions on both ends of the mold, the multi-purpose external protrusion fixing block ( 30 is connected to the sequential steel wire 72 and the sequential maintenance steel wire 74 while installing the sequential fixing device 76 and the sequential maintenance fixing device 78 up and down for continuity at the upper end portion of the upper and lower ends. While installing the central maintenance anchor 82 and the secondary tension anchor 86 at the lower end of the block 30, the central maintenance steel wire 80 and the secondary tensile steel wire 84 are connected, and the PSC beam After installing the continuous connection steel sheet 40 having a predetermined length at one end of the upper flange 12 of 10, placing concrete to cure the PSC beam 10, and first tensioning (II);

 The fabricated PSC beam 10 is installed at the bridge 100 and the bridge 110, and the upper flange 12 is connected to the PSC beam 10 and the PSC beam 10 installed adjacently at the center bridge 100. Connecting the continuous connection steel plate 40 installed in the continuous connection cover steel plate 50 and the high tension bolt 52 to install the continuous connection part 120 (III);

Filling the sequential connection part 120 with concrete while contacting each other at the sides of the PSC beam 10 and the PSC beam 10 by injecting epoxy or filling non-condensed mortar to close the finish (IV);

The sequential primary tension of the PSC beam 10 is introduced by introducing a tension force into the sequential steel wire 72 connected to the sequential anchorage 76 in the upper end of the multi-purpose externally projected fixing block 30 attached to both sides of the PSC beam 10. Forming a slab by pouring concrete on top of the PSC beam 10 after the step (V);

After the slab is formed to introduce a tension force to the secondary tensile steel wire 84 connected to the secondary tensile anchorage 86 at the lower end of the multi-purpose external protrusion fixing block 30 to the secondary tension of the PSC beam 10 ( VI);

It is characterized by consisting of a step (Ⅶ) of the continuous secondary tension by introducing a tension force to the continuous maintenance steel wire 74 connected to the continuous maintenance anchorage (78).

Here, in the central part maintenance fixing unit 82 in the lower end of the multi-purpose external protrusion fixing block 30 after the slab is formed, if the sagging and cracking of the mold, which may be caused during public use, the central part steel wire for maintenance 80 is formed. After insertion, the tension is introduced to the central maintenance steel wire (80) to add a step of tensioning the PSC beam (10).

That is, in the method of continualizing the intermediate point portion of the prestressed concrete girder bridge according to the present invention, the multi-purpose external protrusion fixing block 30 is manufactured, but the PSC beam 10 is attached, and the PSC beam 10 is a preflux beam. ), Prestressed concrete beam (prestressed concrete beam), steel plate beam (steel plate beam), steel box beam (steel box beam) and other steel concrete composite beam of any one of the structural forms.

Here, the multi-purpose externally projected fixing block 30 is installed on each side of the PSC beam 10 one by one or a plurality of if necessary.

Subsequently, the PSC beam 10 is mounted on the pier 100 or the alternator 110, and then connected to the continuous connecting steel sheet 40, the continuous connecting cover steel sheet 50, and the high tension bolt 52, and the teaching apparatus 90. After setting the tension force is introduced into the sequential steel wire 72 connected from the sequential anchorage 76 in the upper end of the multi-purpose external protrusion fixing block 30 to the sequential primary tension of the PSC beam (10).

Subsequently, after the slab casting is cured on the PSC beam 10, the secondary tensile steel wire 84 is tensioned in the secondary tension fixing unit 86 at the lower end of the multipurpose external protrusion fixing block 30, and in some cases, the external purpose The tensioning force is introduced into the continuous maintenance steel wire 74 connected to the continuous maintenance fixing unit 78 in the upper end of the protruding fixing block 30 to perform the continuous secondary tension.

Subsequently, epoxy is injected into the PSC beam 10 and the continuous connection portion 120 of the PSC beam 10, or anhydrous mortar is injected to finish the construction of the structure.

The structure of the intermediate point continuity structure and the continuity method of the prestressed concrete girder bridge according to the present invention having the configuration as described above overcomes the mechanical limitations of the conventional PSC beam and is simple in construction, and various spans or combinations thereof. There is an effect that can be applied to the multi-purpose external projection fixing block efficiently.

As described above, the continuum structure and the continuous method of the middle point portion of the prestressed concrete girder bridge according to the present invention has the following effects.

First, the present invention can increase the length of the bridge as a construction method and excellent structural efficiency, and even if the adjacent span is different, there is an effect that can be applied regardless of the cross-sectional shape.

Second, the present invention can effectively control the cracks during the continuous construction of the bridge, there is an effect that can increase the stability and durability.

Third, the present invention has the advantage that the performance of the PSC beam is maintained intact even when the slab is replaced due to the aging of the bridge after the installation of the maintenance fixture selectively.

Claims (21)

A PSC beam 10 composed of upper and lower flanges 12 and 14 and an abdomen 16; A host holder fixing unit 20 in which a plurality of holders are fixed to fix the host steel wire 22 at the central portions of both side ends of the PSC beam 10; A multi-purpose external protrusion fixing block 30 installed at both sides of the PSC beam 10 at a predetermined width and width and having a wedge-shaped protrusion 32 formed at each corner thereof; A continuous connection steel plate 40 having a shear connector 42 welded to a surface thereof while being installed for continuation of a unit PSC beam 10 having a predetermined size at one end of the upper flange 12 of the PSC beam 10; A continuous connection cover steel plate 50 disposed on the upper and lower surfaces of the continuous connection steel plate 40 and fixedly installed by fastening high tension bolts 52; In the continuous structure of the middle point portion of the prestressed concrete girder bridge, which is fixedly installed on the lower flange 12 of the PSC beam 10 and composed of a sole plate 60 welded with a shear connector 62 on the surface thereof, The multi-purpose external protrusion fixing block 30 is protrudingly installed on both sides of both ends of the PSC beam 10, and is provided in the upper and lower portions of the multi-purpose external protrusion fixing block 30 for continuity, respectively. A sequential fixing unit 76 and a sequential maintenance fixing unit 78 in which the sequencing maintenance steel wire 74 is fixed; A central portion maintenance fixing fixture 82 of the PSC beam 10 installed at the lower end of the multi-purpose external protrusion fixing block 30 and having a central portion maintenance steel wire 80 fixed thereto; The secondary tension fixing wire (86) is fixedly installed under the central part fixing fixture (82), and the secondary tension fixing member (86) is fixedly installed. The multi-purpose external protrusion fixing block 30 is composed of any one of the structural form of reinforced concrete structure, steel structure, steel composite structure, The multi-purpose external protrusion fixing block 30 is attached to at least one side of both sides of the PSC beam 10, The multi-purpose external protrusion fixing block 30 has a cross-sectional shape formed of any one of a lozenge, a trapezoid, a rectangle, a triangle, a polygon, a parallelogram, an equilateral trapezoid, an isosceles trapezoid, The sole plate 60 is fixedly installed over the bottom surface of the lower flange 14 of the PSC beam 10 on one side and the PSC beam 10 on the other side, and the pedestal device 90 is disposed below the sole plate 60. Fixed installation, The sol plate 60 is fixedly installed on the back surface of the lower flange 14 of the PSC beam 10 on one side and the PSC beam 10 on the other side, and the sol plate 60 of the PSC beam 10 on the one side. The sole plate connecting steel plate 64 is fixedly installed to fix and fix the sole plate 60 of the PSC beam 10 on the other side, and the pedestal device 90 is fixed below each of the sole plate connecting steel plate 64. Installed, The sole plate 60 is formed in an L shape as a whole, and a shear connecting member 62 is welded to the surface thereof, but the sole plate 60 is formed of a horizontal plate 61a and the horizontal plate. It is composed of a horizontal plate 61b having an extension width which is bent at right angles to the 61a and expanded relative to the width of the horizontal plate 61a, The sole plate connection steel plate 64 is a horizontal plate 65 made of a rectangular plate shape; A protrusion 66 formed at the center of the horizontal plate 65 at a predetermined width and height; It consists of a vertical plate (67) which is a pair is welded and installed at regular intervals vertically on the protrusion (66), the shear connecting member 68 to the horizontal plate 65, the protrusion 66 and the vertical plate 67, respectively The middle point continuous structure of the prestressed concrete girder bridge, characterized in that the welding). delete delete delete delete delete delete delete delete Assembling the reinforcing bars to form the PSC beam 10 (I); Attaching the multi-purpose external protrusion fixing block 30 on both sides of the assembled reinforcing beam, connecting the host steel wire 22 while installing the host fixing unit 20 at predetermined positions on both ends of the mold, the multi-purpose external protrusion fixing block ( 30 is connected to the sequential steel wire 72 and the sequential maintenance steel wire 74 while installing the sequential fixing device 76 and the sequential maintenance fixing device 78 up and down for continuity at the upper end portion of the upper and lower ends. While installing the central maintenance anchor 82 and the secondary tension anchor 86 at the lower end of the block 30, the central maintenance steel wire 80 and the secondary tensile steel wire 84 are connected, and the PSC beam After installing the continuous connection steel sheet 40 having a predetermined length at one end of the upper flange 12 of 10, placing concrete to cure the PSC beam 10, and first tensioning (II); The fabricated PSC beam 10 is installed at the bridge 100 and the bridge 110, and the upper flange 12 is connected to the PSC beam 10 and the PSC beam 10 installed adjacently at the center bridge 100. Connecting the continuous connection steel plate 40 installed in the continuous connection cover steel plate 50 and the high tension bolt 52 to install the continuous connection part 120 (III); Filling the sequential connection part 120 with concrete while contacting each other on the sides of the PSC beam 10 and the PSC beam 10 by injecting epoxy or filling non-condensed mortar to close the finish (IV); The sequential primary tension of the PSC beam 10 is introduced by introducing a tension force into the sequential steel wire 72 connected to the sequential anchorage 76 in the upper end of the multi-purpose externally projected fixing block 30 attached to both sides of the PSC beam 10. Forming a slab by pouring concrete on top of the PSC beam 10 after the step (V); After the slab is formed to introduce a tension force to the secondary tensile steel wire 84 connected to the secondary tensile anchorage 86 at the lower end of the multi-purpose external protrusion fixing block 30 to the secondary tension of the PSC beam 10 ( VI); In the method of continualizing the mid-point portion of the prestressed concrete girder bridge comprising the step of applying a tension force to the continuous maintenance steel wire 74 connected to the continuous maintenance anchorage 78 to perform the continuous secondary tension, After the slab is formed in the central part maintenance fixing unit 82 in the lower end of the multi-purpose external protrusion fixing block 30, the insertion of the central maintenance steel wire 80 in the case of the sagging and cracking of the mold that may be caused during public use Adding tension to the central maintenance steel wire (80) to add tension to the PSC beam (10), The PSC beam 10 is made of any one type of preplex beam, prestressed concrete beam, steel plate beam, steel box beam, steel concrete composite beam, The assembled PSC beam 10 includes a PSC beam 10 including upper and lower flanges 12 and 14 and an abdomen 16; A host holder fixing unit 20 in which a plurality of holders are fixed to fix the host steel wire 22 at the central portions of both side ends of the PSC beam 10; A multi-purpose external protrusion fixing block 30 installed at both sides of the PSC beam 10 at a predetermined width and width and having a wedge-shaped protrusion 32 formed at each corner thereof; A continuous connection steel plate 40 having a shear connector 42 welded to a surface thereof while being installed for continuation of a unit PSC beam 10 having a predetermined size at one end of the upper flange 12 of the PSC beam 10; A continuous connection cover steel plate 50 disposed on the upper and lower surfaces of the continuous connection steel plate 40 and fixedly installed by fastening high tension bolts 52; It is fixed to the lower flange 12 of the PSC beam 10, consists of a sole plate 60, the shear connector 62 is welded to the surface, The multi-purpose external protrusion fixing block 30 is protrudingly installed on both sides of both ends of the PSC beam 10, and is provided in the upper and lower portions of the multi-purpose external protrusion fixing block 30 for continuity, respectively. A sequential fixing unit 76 and a sequential maintenance fixing unit 78 in which the sequencing maintenance steel wire 74 is fixed; A central portion maintenance fixing fixture 82 of the PSC beam 10 installed at the lower end of the multi-purpose external protrusion fixing block 30 and having a central portion maintenance steel wire 80 fixed thereto; The secondary tension fixing wire (86) is fixedly installed under the central part fixing fixture (82), and the secondary tension fixing member (86) is fixedly installed. The multi-purpose external protrusion fixing block 30 is composed of any one of the structural form of reinforced concrete structure, steel structure, steel composite structure, The multi-purpose external protrusion fixing block 30 is attached to at least one side of both sides of the PSC beam 10, The multi-purpose external protrusion fixing block 30 has a cross-sectional shape formed of any one of a lozenge, a trapezoid, a rectangle, a triangle, a polygon, a parallelogram, an equilateral trapezoid, an isosceles trapezoid, The sole plate 60 is fixedly installed over the bottom surface of the lower flange 14 of the PSC beam 10 on one side and the PSC beam 10 on the other side, and the pedestal device 90 is disposed below the sole plate 60. Fixed installation, The sol plate 60 is fixedly installed on the back surface of the lower flange 14 of the PSC beam 10 on one side and the PSC beam 10 on the other side, and the sol plate 60 of the PSC beam 10 on the one side. The sole plate connecting steel plate 64 is fixedly installed to fix and fix the sole plate 60 of the PSC beam 10 on the other side, and the pedestal device 90 is fixed below each of the sole plate connecting steel plate 64. Installed, The sole plate 60 is formed in an L shape as a whole, and a shear connecting member 62 is welded to the surface thereof, but the sole plate 60 is formed of a horizontal plate 61a and the horizontal plate. It is composed of a horizontal plate 61b having an extension width which is bent at right angles to the 61a and expanded relative to the width of the horizontal plate 61a, The sole plate connection steel plate 64 is a horizontal plate 65 made of a rectangular plate shape; A protrusion 66 formed at the center of the horizontal plate 65 at a predetermined width and height; It consists of a vertical plate (67) which is a pair is welded and installed at regular intervals vertically on the protrusion (66), the shear connecting member 68 to the horizontal plate 65, the protrusion 66 and the vertical plate 67, respectively ) Is a middle point continuation method of prestressed concrete girder bridge, characterized in that the welded joint. delete delete delete delete delete delete delete delete delete delete delete

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