KR20100025162A - Precast psc t-type girder bridge and its construction method - Google Patents

Abstract

PURPOSE: An T-prestressed concrete girder bridge and a construction method thereof are provided to save a bridge construction period by connecting the T-type girders in order to complete an upper part of a bridge. CONSTITUTION: An abutment(200) and a pier excepting a part of a wall are constructed to secure a space. A T-type PSC inner side girder(120), in which a sheath for a second tendon is formed in inside, is established on the abutment and the bridge post in a cross direction. The upper flange of an outside girder(140) and a PSC T-type inner side girder, a partition wall, and a cross beam are interlinked each other in the cross right angle direction. A tendon member is inserted in the sheath for the second tendon in order to pass through the T-type inner side girder and T-type outside girder.

Description

 T-type girder bridge and its construction method {PRECAST PSC T-TYPE GIRDER BRIDGE AND ITS CONSTRUCTION METHOD}

The present invention relates to a T-type PSC girder bridge capable of rapid construction and a construction method thereof, and more specifically, the upper surface of the T-type girder having the widened upper flange has a bottom plate function, and a fence fence and a segmented cross beam when the girder is manufactured. The present invention relates to a T-type PSC girder bridge and its construction method in which the bulkhead or the bulkhead is integrally formed on the girder, and the bridge superstructure is completed only by being mounted on the bridge substructure and connected in the perpendicular direction of the bridge.

Conventional prestressed concrete girder (PSC girder) bridges manufacture the girder at the construction site near the bridge construction site, mount a plurality of PSC girders in the axial direction on the alternating bridge and piers, and then install slabs, cross beams, bulkheads and protective fences. It is hypothesized that the bridge is the most economical type among the bridge types with the length of 30-50m. However, the construction stage is rather complicated, and the construction and construction speed may be low.

In order to improve the construction speed of the PSC girder bridge at home and abroad, two construction methods have been introduced in which a separate bottom plate construction process is omitted.

First, a construction method for completing the bridge by connecting the members manufactured in the axial direction in the axial direction is introduced. The construction method is mainly applied to the box girder section with large torsional stiffness. There is this.

On the other hand, there are not many cases in Korea, but there is a construction method to complete the bridge by connecting the parts manufactured in the perpendicular direction of the axial direction to the axial direction. The cross-sectional shape is 'T', 'Double Tee', and box girder. Various types are applied, and in particular, the T-girder is known to be the most economical cross section because of its light weight and good workability.

In the bridge construction using the T-girder, a plurality of T-girder is mounted on the bridge, and then the girder upper flange is connected to form a cross beam and a partition wall and form a bottom plate, but it is only a bridge work The construction of reinforcing bars, bars and formwork for crossbeams and bulkheads is low.

Since the upper flange of the T-girder is mounted against each other, the concrete is cast using the upper flange after forming a predetermined placing hole in the upper flange to pour the horizontal beam and the partition concrete, but in this case, the horizontal beam and the partition wall formed on the lower surface of the upper flange. It was difficult to assemble the reinforcing bar precisely, and it was difficult to place dense concrete, resulting in coarse construction such as voids between the bottom of the upper girder flange, the cross beam and the top of the partition wall.

On the other hand, the T-type girder has an unstable structure because the upper flange is much larger than the lower flange, there was a fear that the fall accident occurs in the manufacturing, mounting, construction stage.

In addition, since the bottom plate is formed at the same time in the T-girder, when constructing a multi-span continuous bridge, there is a disadvantage in that the branching continuity construction by the branch bottom plate reinforcing connection is not easy.

The present invention is to solve the conventional problems as described above, the object is

After installing the T-type girders in which the upper flange, the cross beam, and the partition wall are integrally formed as the bottom plate in the lower structure of the bridge, connecting the T-type girders in the perpendicular or axial direction to complete the bridge upper structure It is to provide a short span and multi span T-type PSC girder bridge and its construction method which can greatly reduce the bridge construction period.

T-type PSC girder bridge according to the present invention to achieve the above technical problem is

First, it is to be manufactured as a PSC girder with a T-shaped cross section as a whole, but the partition wall is formed in advance corresponding to the point formation position in advance, and the cross beam forming position for distributing the load acting on the girder in the transverse restraint and superstructure of the girder. Corrugated beam is formed in advance, and the upper flange is widened to have a bottom plate function, T-type PSC girder bridge is installed in the axial direction, and then the upper flange, the bulkhead and the horizontal beam are connected in the axial direction of the axial direction, and the final bridge It could be completed.

Second, the T-type PSC girder bridge is divided into the inner girder and the outer girder to determine the formation of partitions and cross beams according to the installation position.

Third, additional prestress can be introduced to the ends of the inner and outer T-type PSC girder bridges in the direction perpendicular to the throttle so that the connection performance can be enhanced.

Fourth, the connection of the inner and outer T-type PSC girders in the axially orthogonal direction forms a notch in the adjacent T-type PSC girder, and arranges and reinforces the loop reinforcement in the notch to secure the connection performance. It was.

Fifth, the inner and outer T-type PSC girder is to be constructed in a simple bridge and a continuous bridge, but in the continuous bridge, the inner and outer T-type PSC girder is firmly and stably mutually in the axial direction using a secondary tension member. The secondary tension member was to be tensioned and settled on the shift side to secure the efficiency of the work space.

According to the present invention, after mounting the inner and outer T-type PSC girder formed integrally with the upper flange, the cross beam, and the partition wall to the lower structure of the bridge, the construction of the bridge upper structure only by the connecting portion is achieved, thereby significantly reducing the construction period.

In addition, according to the present invention, after mounting the outer T-type PSC girder to the bridge lower structure, the construction step of the conventional fence fence is omitted, and since the protective fence is constructed integrally on the outer T-type PSC girder, the construction quality Excellent, the total cross-sectional area and the cross-sectional secondary moment of the outer T-shaped PSC girder is increased to obtain an effect of increasing the cross-sectional efficiency for the load action.

In addition, more rational bridge construction is possible by structurally and stably connecting the inner and outer T-type PSC girders in the axial direction and the perpendicular direction of the axial direction.

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

The T-type PSC girder bridge 100 according to the present invention will be described in the order of short span bridge construction and multi span continuous bridge construction.

First, as shown in Figure 1a, Figure 1b, Figure 1c will be described the characteristics of the step of applying the PSC T-type girder bridge 100 according to the present invention to a short span bridge construction.

In the PSC T-girder bridge 100 according to the present invention, at least one T-type PSC inner girder 120 is positioned side by side in the axial direction perpendicular to each other, and each of both sides of the T-type PSC inner girder 120 each other. A plurality of opposing T-type PSC outer girder 140 is disposed in the axial direction perpendicular to form a cross-sectional direction of the axial direction of one PSC T-type girder bridge (100).

Such a PSC T-girder bridge 100 according to the present invention has a T-type PSC inner girder 120 as shown in Figures 2a to 2c.

The T-type PSC inner girder 120 is such that the upper flange 122 is widened to have a "T" type cross-sectional structure so that the upper flange has a bridged bottom plate function of the bridge, and on the side The segmented cross beam 124 and the partition wall 126 are simultaneously formed.

And the PSC T-girder bridge 100 according to the present invention has a T-type PSC outer girder 140 as shown in Figure 3a to 3c.

The T-type PSC outer girder 140 has the upper flange 142, like the T-type PSC inner girder 120, so that the upper flange 142 has a cross-sectional structure of the "T" type so that the upper flange is the bottom of the bridge. It is formed to have a plate function, and corresponding to the cross beam and the partition wall of the T-type PSC inner girder, the cross beam 144 and the partition wall 146 segmented on one side of the girder are formed at the same time.

Here, the segmentation means that the T-type PSC inner girder and the outer girder are constructed so as to be connected to each other in the axial direction perpendicular to each other so as to be integrally constructed with the final one adjacent to each other.

In addition, at the top of the T-type PSC outer girder 140, a protective fence 148, which is made of concrete in advance, is formed at the time of its manufacture, such a protective fence 148 is the bottom plate of the T-type PSC outer girder 140 ( 142 is used to extend the rebar (not shown).

As described above, the T-type PSC outer girder 140 of the PSC T-type girder bridge 100 according to the present invention omits the construction of a protective fence in the field in the prior art, and in the present invention, the protective fence 148 is the outer girder at the production site. Since it is constructed integrally on (140), the construction quality is excellent, and since it works integrally with the PSC T-type outer girder 140, it can be seen that the total cross-sectional area and the cross-sectional secondary moment of the girder are increased, thereby increasing the sectional efficiency. .

When the PSC girder bridge is designed, since the PSC T-type outer girder 140 is designed in the inner beam type, the load sharing ratio becomes larger than that of the PSC T-type inner girder 120, so that the outer girder 140 is the same as in the present invention. In the case of integrally forming the protective fence 148, there is an advantage that the cross-sectional size of the outer girder 140 and the inner girder 120 can be maintained the same.

On the other hand, although not shown in Figure 3, instead of the concrete fence 148 on the upper surface of the PSC T-type outer girder 140 may also be installed a metal fence (not shown), to install a metal fence In this case, the reinforcement section and the connector are formed at the upper end of one side of the upper flange of the girder so that the protective fence can be connected after the girder construction.

As described above, the PSC T-girder according to the present invention has a length therein before each of the concrete for the PSC T-type inner girder 120 and the PSC T-type outer girder 140 is cast into the PSC T-type girder formwork. The primary tension member 130a of the strand is inserted into the sheath 130 and 150 and the fixing unit 132 and 152 which are previously arranged in a parabolic shape in the direction, and are manufactured by introducing a tension force after curing the concrete.

On the other hand, as shown in Figures 2 and 3, when the PSC T-girder bridge 100 according to the present invention is manufactured for short-span bridge, each of the PSC T-type inner girder 120 and PSC T-type outer girder Since the partition walls 126 and 146 are formed in the form of a vertical wall extending downward from the bottom of the upper flange of the PSC girder to the lower part of the abdomen at the end of the 140, the barrier ribs 126 and 146 can resist the conduction immediately after the mold demoulding. In the construction stage, there is no need to construct a separate fall prevention support structure.

Although not shown in the figure, the upper flange of the upper end of the girder of the present invention, which is mounted on both sides of the alternator, may be provided with a conventional expansion joint after connecting the upper structure. You will block out some of them. This construction method is equally applicable to multi-span continuous bridges.

Hereinafter, the manufacturing step characteristics of the PSC T-girder bridge 100 according to the present invention applied to the multi-span continuous bridge bridge construction will be described.

As shown in Figure 4 when applying the PSC T-girder made in accordance with the present invention in the continuous bridge construction, the end of the PSC T-shaped inner and outer girders (120) 140 mounted on the alternating bridge construction The barrier ribs 126 and 146 described above are formed, but the barrier ribs 126 and 146 are not formed in the alternating side PSC T-shaped inner and outer girders 120 and 140 in the upper portion of the pier, and the reinforcement structure for preventing falling. 160 is provided.

It is formed in a rectangular frame on both sides of the lower side of the upper flange 122, 142 provided in each of the PSC T-shaped inner and outer girders 120, 140, as shown in Figure 5, the girders 120, 140 After mounting on the pier, the sand 162 is added to the fall prevention reinforcement structure 160 to form a perfect bracing structure.

As described above, it is preferable to construct a concrete partition wall at the continuity point of the bridge to be continuously constructed. In this case, only the restraint reinforcing bar (not shown) is additionally added without removing the fall prevention support structure 160, and the partition wall is formed. By construction, the fall prevention reinforcement structure 160 is embedded in the partition wall.

Therefore, the fall prevention support structure 160 is used as a temporary material until the completion of the bulkhead, and to be used as a concrete reinforcement after completion. This is because the point portion of the bridge to be continuously constructed generates a considerable amount of bending parent moment generated in the point portion as compared to the simple bridge construction method. The fall prevention support structure 160 is selectively applied in some cases. It is not excluded to form the same partition.

The PSC T-shaped inner and outer girders 120 and 140 described above are to be structurally connected in the final axial direction perpendicular to the connection such that the connection is formed by the following connection.

The preferred embodiment of the connection section will now be described, which may be commonly applied to simple and continuous bridges.

<Example 1>

Connection portion 240 for connecting the PSC T-shaped inner and outer girders 120, 140 of the T-type PSC girder bridge 100 according to the present invention in the orthogonal direction is alternate, as shown in Figure 6, or In the state of being mounted on the pier 220, the upper flanges 122, 142, the cross beams 124, 144, and the partition walls 126, 146 connect the 'loop reinforcing bars 242' to the girder. 120) 140 when connecting in the axial direction perpendicular to the role of the connection tension and compression reinforcement.

Although not shown in the upper flange and crossbeam, but in the upper flange and the bulkhead,

The notched portions (block-out spaces) are formed to communicate with each other in the adjacent portion thereof, and the loop-shaped reinforcing bars 242 protruding into the notched portions are connected to each other, and the loop-shaped reinforcing bars are embedded. The grouting material 260 is filled in the teeth, and further, the joint seal 262 is further provided at the lower end of the cross beam or the partition wall so that the grouting material 260 does not leak.

According to FIG. 7, the connecting portion 240 of the cross beams 124 and 144 has a diamond-shaped connection structure after the connection, and the diamond-shaped connection structure not only provides a connection space, but also a shear key after the grout injection of the grouting 260. It can be seen that it acts as a resistance to the vertical forces acting on the joints in common.

<Example 2>

8 is a connection portion 240 of both girder upper flanges 122 and 142 at positions where the cross beams 124 and 144 and the partition walls 126 and 146 of the T-type PSC girder bridge 100 according to the present invention are not formed. In order to more firmly connect to the loop-shaped reinforcement 242 and the tension member 280 is shown in detail.

To this end, the connection portion 240 throttles a plurality of through holes 284 for inserting the reinforcing end portion 282 including the haunch portion and the tension member 280 at the lower ends of both girder upper flanges 122 and 142. At the same time to form the girder 120, 140 in the perpendicular direction.

After grouting the connecting portion 240 of the upper flanges 122 and 142, the tension member 280 is inserted into the reinforcing end portion 282 and a tension force is introduced to connect the connecting portion 240.

At this time, the number of through-holes 284 formed in the reinforcing end surfaces 282 of the upper flanges 122 and 142, the tension member 280 standard, and the tension force to be introduced are resisted to the positive moments in the perpendicular direction of the bottom plate throttle due to the working load. Designed to do so, the connection 240 of the loop type rebar 242 may be designed to resist only compressive forces.

<Example 3>

9 is mounted on the pier 220, the PSC T-girder according to the present invention, T-type using the tension member 300 inserted into the cross beam 124, 144 and the branch partition wall 126, 46 PSC inner and outer girders (120, 140) is shown in the structure of the connecting portion 240 for connecting in the axial direction perpendicular.

To this end, the horizontal beams 124, 144 and the partition walls 126, 146 of the T-shaped PSC inner and outer girders 120, 140 according to the present invention, the horizontal beams 124, 144 and the partition wall at the time of its manufacture One or more sheaths 320 penetrating 126 and 146 in the orthogonal direction are provided.

Then, the sheath 320 has a T-shaped PSC inner and outer girders 120 and 140 mounted on the pier 220, and then inserts the tension member 300 of the steel bar or the stranded wire, and the tension force required for the axially oriented connection is To be introduced.

As described above, the connector 240 performs a grouting 260 on the loop-shaped rebar 242 after the tension force of the tension member 300 is introduced so that the tension member 300 crosses 124, 144, or partition 126, 146. To work integrally with the to improve the durability.

Although not shown in the figure, in addition to the connecting method of the cross beams 124, 144 and the partitions 126, 146 using the tension member 300 penetrates the girder upper flanges 122, 142 in the direction perpendicular to the throttle. A sheath (not shown) may be placed, a tension member (not shown) may be inserted, and a tension force may be introduced in the direction perpendicular to the throttle.

The bridge construction method of the present invention by the short span method will be described using the T-type PSC inner and outer girders 120 and 140 with reference to FIGS. 1A to 1C.

First, the shifts are constructed, and the shifts are installed to be spaced apart from each other, according to the normal shift construction method.

Next, the upper flange 122 as a bottom plate, including the abdomen, the point portion is to be formed in the position where the partition wall 126 extending downward from the bottom of the upper flange to the lower abdomen is formed integrally, T-shaped PSC inner girder 120 formed integrally with the cross beam 124 extended downward from the bottom of the upper flange to the middle of the abdomen is installed in the axial direction between the shifts.

1A to 1C, it can be seen that two T-type PSC inner girders 120 are installed adjacent to each other.

Next, each of the T-shaped PSC inner girder 120 is disposed on both sides of the axial direction perpendicular to each other, and the upper flange 142 and the horizontal beam 144 corresponding to the upper flange, the horizontal beam, and the partition wall of the T-type PSC inner girder 120. ) And the partition wall 146 is integrally formed, and the T-shaped PSC outer girder 140 integrally formed with the concrete fence fence 148 to one side of the upper flange is alternately installed between the alternating directions.

Accordingly, it can be seen that the T-type PSC outer girder 140 according to the present invention is installed one by one on both sides of the two T-type PSC inner girder 120.

As such, when the installation work of the T-type PSC inner girder 120 and the T-type PSC outer girder 140 is completed, the upper flange, the partition wall, and the cross beams of the PSC T-type inner girder and the outer girder are connected to each other to form a PSC in the axial direction. T-shaped inner girder and outer girder are connected to each other.

Such axial orthogonal connection may be connected to each other by the embodiments of the connection unit described above.

Hereinafter, a method of constructing a multi-span continuous bridge using a tension member continuously inserted into the T-type PSC inner and outer girders 120 and 140 will be described with reference to FIGS. 10A to 10G.

The multi-span continuous bridge to which the present invention is applied is applied to the bending positive moment and the parent moment due to the fixed load, as well as the live load acting on the girder, in order to further reduce the height of the girder or increase the length of the girder through the point girder sequencing. It is necessary to construct a continuous structure so that it can be completely resisted.

To this end, as shown in Figure 10a, the step of constructing the alternating 200 and piers 220 on the site where the PSC T-girder bridge 100 according to the present invention is installed. However, the alternating wall may be a two-stage construction by the method described later for the secondary tension.

Next, as shown in FIG. 10B, the PSC T-type inner girder 120 and the outer girder provided with the first and second tension sheaths 130 and 150 and the fixing holes 132 and 152 therein. A step 140 is made.

At this time, the primary tension member 130a is tensioned on the lower side primary tension sheath 130 and the fixing unit 132 of the PSC T-type inner girder 120 and the outer girder 140 shown in FIGS. Produced girder in advance.

As such, the step of manufacturing the PSC T-shaped inner girder 120 and the outer girder 140 is made separately from the step of constructing the alternating 200 and the pier 220, the PSC T-shaped inner and outer girder It can be seen that 120 and 140 allow the primary tension force to be introduced and settled through the primary tension member 130a in advance.

Next, as shown in FIGS. 10C and 10D, the PSC T-type inner girder 120 and the outer girder 140 are mounted on the alternating 200 and the pier 220, and the girders 120 and 140 are disposed. Inserting the secondary tension member 150a therein is made.

That is, after mounting the PSC T-type inner girder 120 and the outer girder 140 in the axial direction, the upper flanges 122, 142, partitions 126, 146 and cross beams of the girder 120, 140. In addition to connecting the 124 and 144 in the axial direction, the secondary tension member 150a is formed in the sheath 150 and the fixing member 152 for the secondary tension member formed at the upper ends of the inner and outer girders 120 and 140. ) Is continuously inserted throughout the girder adjacent to the girder (120,140).

Next, as shown in FIG. 10E, a step of constructing the sequential partition wall 224 on the PSC T-shaped inner girder 120 and the outer girder 140 is performed.

The point partition wall 224 may be used in the construction method according to Figures 4 and 5.

In addition, as shown in FIG. 10F, tension and fixation of the secondary tension member 150a inserted into the PSC T-type inner girder 120 and the outer girder 140 is performed.

In this case, since it is difficult to secure the tension work space between the end of the alternating wall 210 and the end of the PSC T-shaped inner girder 120 and the outer girder 140 is shown in FIG. As described above, when the upper end of the alternating wall 210 is mounted with the PSC T-type inner girder 120 and the outer girder 140, the primary construction is performed so that the height of the secondary tension fixing unit 152 is approximately 1 to be the tension work space. Once secured, allow for a second tension. Reinforcing bars (210a) that are vertically reinforcement to the wall is extended to protrude to the top of the wall to serve as a connecting reinforcement when connecting to the remaining walls after the tension work.

After the secondary tension work is completed on the PSC T-shaped inner girder 120 and the outer girder 140 as shown in FIGS. 10G and 12, the remaining walls 212 are constructed on the alternating walls 210. The step of completing the shift 200 is made.

During the construction of the remaining walls 212 as described above, the reinforcing bars 212a are internally reinforced.

Next, in the process of constructing a multi-span continuous bridge by using the PSC T-type inner girder 120 and the outer girder 140 according to the present invention, the tension member 364 and the anchorage formed in the haunting portion 340 of the girder. 362) will be described in more detail the bridge continuity construction process in the axial direction.

In the PSC T-type girder bridge 100 according to the present invention, the inner and outer girders 120 and 140 have the same load acting for each construction stage except for the paving construction stage, so that the total tension required for the design load in the girder manufacturing stage There is an advantage that can be introduced in a batch.

Therefore, the girder according to the present invention in the sequential construction stage is a state supporting the fixed load, it is preferable to apply the secondary tension method of the point portion so as to resist only the bending moment generated by the paving and live load,

To this end, as shown in FIGS. 13 and 14, a pair of anchorage reinforcement end surfaces 360 are formed in the T-girder haunting portion 340 in the axial direction, and the sheath 362 penetrated in the axial direction. To be provided.

And after mounting the girders (120, 140), constructing the continuum point partition wall 224, inserting the tension member 364 made of a steel rod formed with a thread in the sheath 362 formed in the haunch 340, Tightening force is introduced and fastened by fastening the mounting holes 366 made of hydraulic nuts.

In addition, in order to effectively resist the bending moment acting on the point portion, it is preferable that the tension member 364 and the fixing unit 366 are located at the top of the girder 120 and 140, but in the case of using general hydraulic equipment, Since space is difficult to secure, the hydraulic nut 366 having a small outer diameter is used for fixing. Since the hydraulic nut can be used as a conventional product used in the field, detailed descriptions such as the operation principle and the fixing method will be omitted.

As described above, in the present invention, the upper flanges 122, 142, the cross beams 124, 144, and the partitions 126, 146 are alternately formed with the T-girder 120, 140, 210, After mounting on the bridge pier 220, by completing the bridge upper structure only by the construction of the connection portion in the direction perpendicular to the bridge axial effect can be significantly reduced construction period.

In addition, according to the present invention after the girders (120, 140) to the pier 220, the construction step of the conventional protective fence 148 to be omitted, the protective fence 148 is the outer girder 140 in the workshop As it is constructed integrally on the phase, the construction quality is excellent, and since it works integrally with the PSC T-type girder bridge, the total sectional area of the girder and the cross-sectional secondary moment are increased, thereby increasing the sectional efficiency.

Although the present invention has been described in detail with reference to the accompanying drawings, the present invention is not limited to such a specific structure. Those skilled in the art will be able to variously modify or change the embodiments of the present invention without departing from the spirit and scope of the present invention as set forth in the claims below. Nevertheless, it will be apparent that all such modifications or design modifications to such simple embodiments will clearly fall within the scope of the present invention.

1 is a detailed view of a T-type PSC girder bridge according to the present invention, a is a cross-sectional view, b is a plan view, c is a side view;

2 is a cross-sectional view of the inner girder when the T-type PSC girder bridge according to the present invention is applied to a short span bridge, a is a cross-sectional view along the line AA of Figure 1b, b is a cross-sectional view along the line BB of Figure 1b, Figure 1b Cross section along line CC;

3 is a cross-sectional view of the outer girder when the T-type PSC girder bridge according to the present invention is applied to the short span bridge, a is a cross-sectional view along the line AA of Figure 1b, b is a cross-sectional view along the line BB of Figure 1b, Figure 1b Cross section along line CC;

4 is a cross-sectional view showing the end support structure of the girder when the T-type PSC girder bridge according to the present invention is applied to a multi-span bridge;

5 is a cross-sectional view in which the girder is disposed in the axial direction perpendicular to the T-type PSC girder bridge according to the present invention when applied to a multi-span bridge;

Figure 6 is a cross-sectional view showing the structure of the first embodiment of the connection portion made in the perpendicular direction in the T-type PSC girder bridge according to the present invention;

FIG. 7 is a detailed sectional view of the first embodiment of the connecting portion shown in FIG. 6; FIG.

8 is a cross-sectional view showing the structure of a second embodiment of the connecting portion made in the axial direction perpendicular to the T-type PSC girder bridge according to the present invention;

9 is a cross-sectional view showing the structure of the third embodiment of the connecting portion made in the axial direction perpendicular to the T-type PSC girder bridge according to the present invention;

10 is a process explanatory diagram showing the construction method of the T-type PSC girder bridge step by step according to the present invention;

11 is a cross-sectional view showing the process of the secondary tension in the construction method of the T-type PSC girder bridge according to the present invention;

12 is a cross-sectional view showing a process of building an alternating wall after the secondary tension in the construction method of the T-type PSC girder bridge according to the present invention;

13 is a cross-sectional view and a side view showing a girder formed with a sheath for secondary tension in the T-type PSC girder bridge according to the present invention;

14 is a side sectional view showing a branch reinforcement structure in the T-type PSC girder bridge according to the present invention.

<Description of Symbols for Major Parts of Drawings>

100 .... T-type PSC girder bridge according to the present invention

120 ..... inner girder 122.142 .... upper flange

124,144 .... pedestrian crossing 126,146 .... bulkhead

130,150 ... She's 132,152 ... Settlement

130a, 150a ... Tension 140 ..... Outer girder

148 .... Protection fence 160 ... Reinforcement structure to prevent falling

200 .... shift 220 .... pier

240 .... Connections 260 .... Grouting

280 .... tension member 282 .... reinforced cross section

284 .... through hole 300 .... tension

320,362 ... Sheath 340 .... Girder Hunt

362 .... Settlement 364 .... Tension

366 .... Mounting Hole

Claims (12)

The tension material is provided in the axial direction as a PSC girder, but includes an upper flange as a bottom plate and an abdomen, and a partition wall extending downward from the bottom of the upper flange to the lower part of the abdomen is integrally formed at the point where the point portion is to be formed. A T-shaped PSC inner girder integrally formed at the bridge lower structure by having a cross beam extending downward from the upper flange bottom to the middle of the abdomen in a position where the cross beam is to be formed; As the PSC girder is provided with a tension member therein in the axial direction, respectively disposed on both sides of the axially perpendicular to the T-type PSC inner girder, the upper flange, the cross flange and the upper flange of the T-shaped PSC inner girder, T-shaped PSC outer girder is formed in the bridge lower structure to be formed integrally with the concrete fence fence to one side of the upper flange as well as to form a cross beam and partition wall integrally; And T-type PSC girder bridge comprising a; connecting portion connecting the upper flange, the cross beam, the partition wall of the T-type PSC inner and outer girders in the axial direction. The method of claim 1, wherein the connecting portion is formed in the upper flange and the cross beam or the upper flange and the partition wall, so as to form notches (block-out spaces) communicated vertically to each adjacent portion thereof, and protrudes into the notch portion The loop reinforcing bars are connected to each other, but the grouting material is filled in the notch so that the loop reinforcing bars are embedded, and the joint seal is further provided at the lower side of the cross beam or the partition wall so that the grouting material does not leak. T type PSC girder bridge. The reinforcing cross-section is spaced apart from each other so that the connecting portion has a notch (block-out space) formed at an adjacent portion of the upper flange where the cross beam and the partition wall are not installed, and the lower end of the upper flange is thickened. And form a plurality of through-holes in the axial direction perpendicular to the reinforcing end face portion, inserting a tension member and introducing a tension force to be connected. The loop-shaped reinforcing bars projecting to the notch part are connected to each other, and the grouting material is filled between the notched part and the adjacent reinforcing cross-section so that the loop-shaped reinforcing is embedded, but the lower adjacent part of the reinforcing cross-section part does not leak out. T-type PSC girder bridge characterized in that the joint seal is further provided. According to claim 1, In the multi-span continuous bridge construction, the inner and outer T-shaped girder end haunch portion is further included in the sequencing point portion, the fixing unit reinforcing cross-section portion is provided in the anchorage reinforcing cross-section portion is provided with a sheath respectively T-type PSC girder bridge, characterized in that the tension material is inserted into the sheath to be fixed after the tension. The T-type PSC girder bridge according to claim 4, wherein the tension member is made of a steel bar, and the fixing member is made of a hydraulic nut. In the bridge construction of the simple bridge method, Constructing the shift; The upper flange as a bottom plate, including the abdomen, the location where the point is to be formed integrally formed barrier ribs extending downward from the bottom of the upper flange to the lower abdomen, in the position where the cross beam is installed downward extending from the bottom of the upper flange to the middle of the abdomen Installing a T-shaped PSC inner girder formed integrally with the cross beam in the axial direction between the shifts; The upper flange, the cross beam and the partition wall of the upper flange, the cross beam and the partition wall of the T-type PSC inner girder, respectively, are arranged integrally with each other and are formed integrally with each other. Installing a T-type PSC outer girder integrally formed with a concrete fence to one side in the axial direction between the shifts; And connecting the upper flanges, the partition walls, and the cross beams of the PSC T-type inner girder and the outer girder to each other to connect the PSC T-shaped inner girder and the outer girder to each other in the direction perpendicular to the axial axis of the T-type PSC girder bridge construction method. In the bridge construction of the continuous bridge system, Constructing shifts and piers excluding a portion of the wall to secure space for tension work; An upper flange as a bottom plate, including an abdomen, wherein the branch portion is formed integrally with the partition wall extending downward from the bottom of the upper flange to the lower abdomen, and in the crossbeam position is a horizontal beam extending downward from the bottom of the upper flange to the middle of the abdomen Installing a T-shaped PSC inner girder integrally formed with a sheath for a secondary tension member in the alternating direction and the pier in the axial direction; The upper flanges, horizontal strips and partition walls corresponding to the upper flanges, the cross beams and the partition walls of the T-shaped PSC inner girder, respectively, are formed integrally with the upper flanges. Concrete protection fence is integrally formed to one side of the step of installing the T-type PSC outer girder formed inside the sheath for the secondary tension material in the alternating and pier in the axial direction; Connecting the upper flanges, the partitions, and the cross beams of the PSC T-shaped inner girder and the outer girder to each other to connect the PSC T-shaped inner girder and the outer girder to each other in a axial direction; Inserting the tension member into the sheath for the secondary tension member so as to pass through the T-type inner girder and the T-type outer girder and then fixing it after tension in the shift; And T-type PSC girder bridge construction method comprising the step of completing the alternating wall. The method of claim 6 or 7, wherein the partition wall of the inner and outer girders to be provided with a fall prevention reinforcement structure in advance when the manufacturing, the fall prevention reinforcement structure is to be installed as a steel frame on the lower portion of each upper flange , T-type PSC girder bridge construction method characterized in that the steel frame can be made to form a concrete for the partition to be embedded. The method of claim 6 or 7, wherein the step of connecting the PSC T-shaped inner girder and the outer girder with each other in the axial direction perpendicular to Forming a notch portion (block-out space) which is connected to the upper flange and the cross beam or the upper flange and the partition wall so as to communicate vertically with each adjacent portion thereof; And The loop-shaped reinforcing bars projecting to the notch part are connected to each other, but the grouting material is filled in the notch so that the loop-shaped reinforcing is embedded, but the joint seal is further provided at the lower side of the cross beam or the partition wall so that the grouting material does not leak. T-type PSC girder bridge construction method comprising a. The method of claim 6 or 7, wherein the step of connecting the PSC T-shaped inner girder and the outer girder with each other in the axial direction perpendicular to In the upper flange where no horizontal beams and partition walls are installed, notches (block-out spaces) are formed at adjacent portions thereof, and further, the reinforcing end portions are formed to face each other so that the lower ends of the upper flanges are thickened and face each other. Forming a plurality of through-holes in the orthogonal direction and inserting a tension member and introducing a tension force to be connected to the portion; and The loop-shaped reinforcing bars projecting to the notch part are connected to each other, and the grouting material is filled between the notched part and the adjacent reinforcing cross-section so that the loop-shaped reinforcing is embedded, but the lower adjacent part of the reinforcing cross-section part does not leak out. T-type PSC girder bridge construction method comprising the step of further comprising a joint seal. 8. The method of claim 7, further comprising the step of connecting the PSC T-shaped inner girder and the outer girder to each other in the axial direction prior to the step of connecting the PSC T-shaped inner girder and the outer girder to each other in the axial direction. In the connection portion of the upper flange and the abdomen of the PSC T-type inner and outer T-girder further includes a fixing unit reinforcing cross-section portion on its haunch, through the fixing unit reinforcing cross-section portion in the axial direction, respectively , T-type PSC girder bridge construction method characterized in that the tension material including a steel rod is inserted into the sheath to be fixed by a fixing device including a nut after the tension. The method of claim 7, wherein the step of installing a shift except for a portion of the wall for securing the space for the tension work The alternating wall is first constructed so as to be the height of the secondary tension anchorage of the inner and outer girders to secure the tension work space, and then the final wall is completed after the secondary tension material tension and fixation work is performed. T-type PSC girder bridge construction method characterized in that.

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