KR20040103529A - Five Segmental Bulb-Tee Girder for a Bridge and It's Constructional method - Google Patents

Abstract

PURPOSE: A five-segmental bulb-tee girder for a bridge and a construction method thereof are provided to construct and design simply by assembling five segments of the girder corresponding to tare or size of the girder. CONSTITUTION: A girder assembling system comprises a bottom plate, a web, an upper flange, an upper flange haunch part, a lower flange, a lower flange haunch part, a double haunch part, segments, a point segment, a shear key(11), an alignment key(12), a bracket(13), a first tendon, a second tendon, a shear groove(21), an alignment groove(22), a first tendon sheath pipe(24), a second tendon sheath pipe(25), a first segment(A), a second segment(B), a third segment(C), a fourth segment(D), and a fifth segment(E). The precast girder is manufactured, and transported to the bridge installation place. The five-segmental precast girder is integrated with the uneven part and strained according to load and tare, and placed on the pier. A slab is installed on the upper part of the girder, and jacking force is applied to the girder according to load.

Description

Five Segmental Bulb-Tee Girder for a Bridge and It's Constructional method}

The present invention relates to a five-segment segment bulb-tee girder and a construction method thereof for a bridge. More specifically, the present invention relates to a BULB-TEE girder that changes the cross-sectional parameters of an existing 30-meter standard PSC type I girder and a 30-meter girder Considering the size, the girder is segmented into 5 segments so as not to violate the provisions of Article 28 of the Road Act, and the precast segment method is used to assemble and construct five segmented girders during construction, thereby increasing the simplicity and economical efficiency of design and construction. The present invention relates to a five-segment segmental bulb-tee girder for bridge construction and its construction method.

In Korea, as the number of vehicles increased due to the development of the automobile industry and the increase in income since the 1980s, the need for road extension and long-span bridges has emerged.

As a construction method for bridges over 30m, PSC type I girders have been used in Korea. However, the PSC type I girder was ineffective at 30m in terms of transportation, construction and construction.

If the bridge is longer than 30m, it can be constructed as steel bridge, PSC box bridge or preflex bridge. However, these types of bridges are somewhat uneconomical, with construction costs more than twice that of PSC girder bridges, making them unsuitable for the construction of 30m bridges. Therefore, it is required to develop a more efficient 30m bridge construction method while the construction cost is low.

Korean Laid-Open Patent Publication No. 2003-0037258 relates to a continuous tension steel member using anchorages and biasing portions protruding ribs laterally in the girder height of two or more spans of continuous girder bridges, in particular to improve bending strength against external forces. Techniques for continuous tensile steel beams using prestressing, in which compressive and tensile stresses are applied to the loading of a load over a continuous span, are described.

Korean Patent Publication No. 2003-0011028 discloses a precast concrete panel composite beam having a prefabricated concrete panel and a steel beam that is more firmly connected to behave completely in one piece, and has an assembly structure that is easy to assemble. A technique relating to assembly is disclosed,

The Republic of Korea Utility Model Registration No. 20-0268189 is equipped with a removable scaffold ring to eliminate the interference with the equipment transported to the upper portion of the bridge during the construction of the bridge to improve workability and safety, and after construction of the bridge girder And the scaffolding structure of the road bridge girders, which makes the exterior of the bridge beautiful,

The prior art as described above has a problem that the girder is at least 30m inconvenient to transport, and difficult to construct.

In order to solve the above problems, the present invention is designed to be more efficient as a BULB-TEE girder and suitable for 30m bridges by changing the cross-sectional parameters of the existing 30m standard PSC type I girder, and also has the weight and size of the 30m girder. Considering this, the girder is segmented into 5 segments so as not to violate the provisions of Article 28 of the Road Act, and the precast segment construction method is used to assemble and construct five segmented girders during construction, thereby increasing the simplicity and economical efficiency of design and construction. It is an object of the present invention to provide a five-segment segment bulb-tee girder and its construction method for bridges that can be installed as.

For reference, consider the following restricted vehicle provisions in Article 28, paragraph 3 of the Road Act:

1.Vehicles whose weight exceeds 10 tons or whose total weight exceeds 40 tons

2. Vehicles exceeding 2.5 meters in width, 4.0 meters in height and 16.7 meters in length

3. Vehicles recognized by the Authority as having particular obstacles to the preservation of road structures and the safety of traffic.

It can be seen that.

1 is a girder construction state diagram of a bridge for 30 meters according to the present invention

2 is an exploded view of assembling 30-meter 5-segment segmental bulb-tee girder

Figure 3 is a detailed view of the five segment segmental bulb-tee girder in accordance with the present invention

4 is a detailed view of the five-segment segmental bulb-tee girder in accordance with the present invention

5 is a partial cross-sectional detail view of the first segment A according to the present invention.

6 is a detailed cross-sectional view of the portion b of the first segment A according to the present invention.

Fig. 7 is a detailed cross-sectional view of section c of the third segment C according to the present invention.

8 is a detailed cross-sectional view of the portion d of the fifth segment (E) according to the present invention.

9 is a detailed cross-sectional view of each segment of a 30m bridge according to the present invention.

10 is a shear key state diagram of a girder according to the present invention

<Explanation of symbols for the main parts of the drawings>

Bottom plate slab (1), web (2), upper flange (3), upper flange haunch (4), lower flange (5), lower flange haunch (6), double haunch (7), general type I segment (8), general type II segment (9), point segment (10), shear key (11), alignment key (12), bracket (13), primary tension member (14), secondary tension member (15) ), Shear groove (21), alignment groove (22), primary tension ash tube (24), secondary tension ash tube (25), first segment: A, second segment: B, third segment : C, fourth segment: D, fifth segment: E.

In order to achieve the above object, the present invention is to manufacture each girder as a five-segment precast girders to suit the scope of transport, and then transport to the bridge construction site, each of the five segmented precast girders to match the irregularities of the girder At the same time, the initial curve tension is introduced in consideration of the weight of the girder, the load of the top plate (1), the load of the bottom plate (1), and then integrated into a 30m girder. After mounting, place the bottom plate (1) on the top of the mounted girder, and after the hardening of the bottom plate (1), a five-segment segmental bulb for bridges that applies secondary curvature tension to the girders, taking into account additional fixed and live loads. It is about tee girder and his construction method.

In general, the cross section of the girder affects not only the structural efficiency but also the economics. The larger the cross section, the larger the self-weight of the girder, which increases the fixed load that the member must bear. This not only requires a lot of tension and requires higher compressive strength of concrete, but also increases the amount of rebar, which in turn leads to inefficiency of the cross section.

The present invention used an efficiency cross section suitable for 30m segmental bridge through the relationship between the cross-sectional variables, the amount of tension, the member stress for the efficiency of the cross section. The design condition of the present invention was based on the bridge model of reciprocating four-lane bridge width (19.50m) with a length of 30m, the concrete design reference strength was used 500kgf / cm ² , the strength of the upper floor plate (3) is 270kgf / cm ^2, unit weight in the case of the girder and the upper bottom plate (3) along the highway bridge design criteria was used 2.5tonf / m ^3, when the packing was the 2.3tonf / m ^3.

Reducing the thickness while increasing the width of the upper flange 3 of the girder can structurally increase the efficiency of the cross section. Therefore, in the present invention, the width of the upper flange 3 was selected as 120 cm, and the thickness of the upper flange 3 was selected as 10 cm. In addition, the haunting portion 4 of the upper flange was able to resist local buckling and shear force acting on the flange while reducing the self-weight of the girder and applied 10 cm in consideration of aesthetics.

In the case of the lower flange (5), considering the size of the sheath pipe and reinforcing bar, concrete cover, distance between the sheath pipe and the bottom of the girder, which will be located in the lower flange (5) at the center of the ground, In order to resist the compressive stress generated at, the width of the lower flange (5) was applied to 90 cm and 20 cm thick. In addition, the haunting portion 6 of the lower flange was applied to 15cm in consideration of the compaction in the concrete pouring process during the manufacture of the girder.

The width of the web (2) was 25 cm in consideration of the use of D13 as the vertical reinforcement bars and the reinforcement bars in the abdomen, 4 cm concrete cover and 8.5 cm diameter sheath pipe.

The height of the girder can be selected based on the compressive strength of the concrete used in the girder and the amount of tension used. In the present invention, the height of the girder was selected 120cm in consideration of the effect of the increase in the fixed load according to the change in the height of the duct 3EA and the duct 2EA used for the final tension and the girder height.

The girder used in the present invention is divided into 5 segments of a 30m girder that is commonly used,

Span 30 m Upper flange width 120 cm Upper flange thickness 10 cm Upper Flange Haunt Width / Thickness 42.5 / 10 cm 2nd haunch width / thickness 5/5 cm Bottom flange width 90 cm Bottom flange thickness 20 cm Lower Flange Haunting Width / Thickness 32.5 / 15 cm Abdominal width 25 cm Girder height 120 cm Cross section 6291.3 cm ² Section Second Moment 11744144 cm ⁴ downtown yt 61.06 cm yb 58.94 cm Section modulus Zt 199258.9 cm ³ Zb 273379.9 cm ³ Flexural section efficiency 0.519

table

If the 30m girder having such a cross section is manufactured integrally in the field, a predetermined site is required at the construction site. However, depending on the site, such site requirements may not be satisfied, and additional construction costs for a given site will be incurred. Thus, in order to solve this difficulty, the present invention divides the 30m girder into five segments and thus, the first segment A, the second segment B, the third segment C, the fourth segment D, and the fifth segment. Part E is manufactured at the factory.

The first segment (A), the second segment (B), the third segment (C), the fourth segment (D), and the fifth segment (E) are two first segments positioned in front and rear surfaces. Branch (A) and the fifth segment (E) are three segment segments (B), third segment (C) and fourth segment (D), which are located at the point segment type and the middle section. It is divided into segment (8, 9) type. In case of point type, the length is 5.95m and in case of general type, the length is 6m.

The general division is divided into general type I (8) and general type II (9). Therefore, the types of girder segments manufactured at the factory are the first segment A, the second segment B, the third segment C, the fourth segment D, and the fifth segment E. There are a total of five.

The girder manufactured through a predetermined manufacturing period is transported to the construction site by using a transport vehicle. The first segment A, the second segment B, the third segment C, the fourth segment D and the fifth segment E thus conveyed are integrated through the initial curve tension. . Integrated girders are mounted on piers using temporary equipment. The bottom plate 1 is poured on each mounted girder, and when the poured bottom plate 1 is hardened, secondary tension is introduced.

For the construction of the joint section, the design should be designed to withstand the weakest shear stress at the joint section. However, the PSC type I girder uses a simple shear key (11), which is easy to construct to resist shear and compressive stress because the abdominal cross section is smaller than the structure and the compressive stress that the cross section must bear is large. An alignment key (12) was used on the upper flange (3) to control the lateral displacement between the girder.

Hereinafter, the construction method using the five-segment segmental bulb-tee girder for the bridge of the present invention through the following examples.

Example

First process (manufacturing five-segment segmental bulb-tee girder)

The first segment (A), the second segment (B), the third segment (C), the fourth segment (D), and the fifth segment (E), respectively, in the form of five segments of the girder at the factory. After forming a conventional formwork and molded in a conventional manner with steel mortar or reinforcement containing cement mortar, and after a certain curing period, demolding from the formwork to produce each 5-segment segmental bulb-tee girder,

2nd process (manufacture of 5 segment segmental bulb-tee girder)

Each of the five segmented segmental bulb-tee girders manufactured in the first process, that is, the first segment A, the second segment B, the third segment C, and the fourth segment D) and the fifth segment E are transported to the construction site, the shear key 11 and the alignment key 12 formed at one segment at the construction site have shear grooves of other neighboring segments ( 21) and the alignment groove 22, the first segment (A), the second segment (B), the third segment (C), the fourth segment (D) and the fifth segment (E) Into one (see Figure 10),

(At this time, how to assemble the five segmented parts into one girder in detail,

An alignment groove 22 having two grooves formed at a predetermined interval on a rear side of the first segment A and the upper flange 3, and a shear groove 21 having a groove formed in a ladder shape on one side of the rear surface of the web 2. ), An alignment key 12 having two protrusions formed at a predetermined distance on one side of the front flange 3 of the second segment B, and a ladder shape on one side of the rear surface of the web 2. Insert and connect the shear key 11 protruding into each other,

An alignment groove 22 having two grooves formed at a predetermined interval on a rear side of the second segment B upper flange 3, and a shear groove having a groove formed in a ladder shape at one side of the rear surface of the web 2. 21, an alignment key 12 having two protrusions formed at a predetermined interval on the front side of the upper flange 3 of the third segment C, and a ladder shape at the rear side of the web 2; Insert and connect the shear key 11 protruded into each other,

An alignment key 12 having two protrusions formed on one side of the rear surface of the upper flange 3 of the third segment C at a predetermined interval, and protruding in a ladder shape on one side of the rear surface of the web 2. The front end key 11 of the fourth segment D on the rear side of the upper flange 3, the alignment groove 22 having two grooves formed at regular intervals, and the rear side of the web 2 in a ladder shape. Inserted into the groove formed in the shear groove 21 and connected,

An alignment key 12 having two protrusions formed at a predetermined interval on a rear side of the upper flange 3 of the fourth segment D and a ladder protruding on one side of the rear side of the web 2. The front end of the upper flange (3) of the fifth segment (E) and the alignment groove (22) formed with two grooves at regular intervals, and a ladder shape on one side of the rear surface of the web (2) Inserted into the grooved shear groove 21 is connected and assembled into one girder.)

In the assembled girder, the primary tension member sheath tube (24) formed at the lower part of each segment is inserted into the primary tension member (14) and then tensioned to integrate each girder,

3rd process

After mounting a plurality of girders integrated as in the second step to the piers using a temporary equipment, after placing the bottom plate 1 on the girder to harden, the secondary tension ash formed on the bracket 13 of the girder After the secondary tension member 15 is inserted into the secondary tension ash sheath tube 25 formed at the upper and lower portions of the pipe and each segment of the assembled parts, the assembled girder is subjected to secondary tension, and then subjected to a predetermined curing period, and then the bottom plate 1 Asphalt pavement and other facilities were installed on the upper part of), and the bridge was constructed using a five-segment segmental bulb-tee girder.

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

Figure 1 girder construction state of the bridge for 30 meters according to the present invention, Figure 2 30 meter five segment segmental bulb-tee girder assembly disassembled detail according to the invention, Figure 3 five segment segmental bulb-tee according to the present invention Fig. 4 is a sectional view of the girder, Fig. 4 is a detailed view of the five-segment segment bulb-tee girder plane according to the present invention, Fig. 5 is a partial cross-sectional detail view of the first segment A according to the present invention, Fig. 6 B partial cross-sectional detail view of one segment (A), FIG. 7 c partial cross-sectional detail view of the third segment (C) according to the present invention, FIG. 8 d partial cross-sectional detail view of the fifth segment (A) according to the present invention, 9 is a detailed cross-sectional view of each segment of a 30m bridge according to the present invention, and FIG. 10 is a state diagram in which girder angular segments are jointed according to the present invention, and the bottom plate 1, the web 2, the upper flange 3, Upper Flange Haunting Section (4), Lower Flange (5), Lower Flange Hunting Section (6), Double Hunting Section (7), General Type I Segment (8), General Type II Segment (9), Spot Segment 10, shear key 11, alignment key 12, bracket 13, primary tension member 14, secondary tension member 15, shear groove 21, alignment groove 22 1st tension ash tube (24), 2nd tension ash tube (25), 1st segment: A, 2nd segment: B, 3rd segment: C, 4th segment: D, 5th segment It can be seen that part: E is shown.

Looking at the structure, as shown in Figures 2 to 3, the conventional girder is divided into five, the first segment A formed on the front surface and the first formed on the rear surface of the first segment A The second segment portion B, the third segment portion C formed on the rear surface of the second segment portion B, and the fourth segment portion D formed on the rear surface of the third segment portion C. And, as a structure of a five-segment segmental bulb-tee girder for a bridge composed of the fifth segment (E) formed on the rear of the fourth segment (D),

As shown in FIGS. 2 to 6, the first segment A is a part of the branch segment 10, and the first segment A is the first of the five segments of the 30-meter girder.

As the web 2 (middle part) is inclined (narrows) from the front side to the rear side, the front part is formed in the upper flange 3 formed in the upper portion and the rectangular shape in the lower portion of the upper flange 3, Bracket 13 is provided to protrude in the groove formed on both sides of the web (2) inclined to one side of the middle portion and is provided with a secondary tension ash tube 25,

The rear end portion has an "H" shape as the vertical shape, the upper and lower portions are wide, and the middle portion is a narrow shape. The upper flange haunting portion 4 inclined to be narrowed inwardly formed at the lower portion of the upper flange 3 and the upper portion. It is formed in the lower portion of the flange haunch (4), a double inclined portion 7 inclined rapidly, the web (2) formed in the lower portion of the double haunch (7), the lower portion of the web (2), A lower flange 5 composed of lower flange haunches 6 inclined outwardly on both sides, and a primary tension ash tube 24 having three sheath tubes formed at regular intervals on one side of the lower flange 5; It is provided on one side of the middle of the web (2) is formed to be inclined downward from the middle portion and is provided with a secondary tension ash sheath pipe 25 formed with two sheath pipes at a predetermined interval,

The rear flange of the upper flange 3 is composed of an alignment groove 22 having two grooves formed at predetermined intervals, and a shear groove 21 having a groove formed in a ladder shape on one rear surface of the web 2.

The second segment portion (B) and the fourth segment portion (D) are symmetrical shapes of the general type I segment 8, as shown in Figs.

The second segment B has a shape of “H” vertically and has a wide upper and lower portions and a narrow middle portion. The second flange portion B is formed at the lower portion of the upper flange 3 and inclined to narrow inwardly. ), A double hunched portion 7 formed on the lower portion of the upper flange chamfer portion 4 and inclined rapidly, a web 2 formed on the lower portion of the double hunt portion 7, and a lower portion of the web 2. It is formed in, and is provided with a lower flange (5) consisting of lower flange haunch portion 6 inclined to both sides,

The front side of the upper flange (3) is composed of an alignment key (Alignment key 12) formed with two protrusions at a predetermined interval, and a shear key 11 protruding in a ladder shape on one side of the back of the web (2) And

An alignment groove 22 having two grooves formed at a predetermined interval on a rear side of the upper flange 3, a shear groove 21 having a groove formed in a ladder shape at a rear side of the web 2, and

The middle tension side of the lower flange (5) is provided with a primary tension ash sheath tube 24 formed with three sheath tubes at a predetermined interval, and is provided on the middle one side of the web (2) and formed to be inclined downward from the middle portion and a predetermined interval As can be seen that it consists of a secondary tension ash sheath pipe 25 formed with two sheath pipes,

The third segment C is located at the center of the girder, as shown in FIGS. 2 to 4 and 7, and is a general type II segment.

An upper flange hunt portion 4 formed on the lower portion of the upper flange 3 and inclined to be narrowed inward, a double hunt portion 7 formed on the lower portion of the upper flange hunt portion 4 and inclined rapidly; It is provided with a web (2) formed on the lower portion of the double hunt portion (7), and a lower flange (5) formed on the lower portion of the web (2), consisting of lower flange chamfer (6) inclined outwardly on both sides And

The front and rear surfaces of the upper flange 3 are composed of an alignment key (Alignment key 12) formed with two protrusions at predetermined intervals, and a shear key 11 protruding in a ladder shape on one side of the rear surface of the web 2. And

The middle tension side of the lower flange (5) is formed between three primary sheath tube formed with three sheath tube at a predetermined interval, and two sheaths formed at regular intervals spaced up and down between the primary tension ash tube (24). It can be seen that the tube is formed of a secondary tension ash tube 25,

As shown in FIGS. 2 and 4, the fourth segment D is a general I-shaped segment 8 having a symmetrical shape of the second segment B. The upper segment is wide and has a "H" shape vertically. The middle part is a narrow shape,

An upper flange hunt portion 4 formed on the lower portion of the upper flange 3 and inclined to be narrowed inward, a double hunt portion 7 formed on the lower portion of the upper flange hunt portion 4 and inclined rapidly; It is provided with a web (2) formed on the lower portion of the double hunt portion (7), and a lower flange (5) formed on the lower portion of the web (2), consisting of lower flange chamfer (6) inclined outwardly on both sides And

An alignment groove 22 having two grooves formed at a predetermined interval on a front side of the upper flange 3, a shear groove 21 having a groove formed in a ladder shape at a rear side of the web 2, and

The rear side of the upper flange (3) consists of an alignment key (Alignment key 12) formed with two protrusions at a predetermined interval, and a shear key 11 protruding in a ladder shape on the rear side of the web (2) ,

The middle tension of the lower flange (5) is provided with a primary tension ash tube 24 formed with three sheath tubes at a predetermined interval, and is provided on the middle one side of the web (2) and formed to be inclined from the middle portion to the upper portion at regular intervals. It can be seen that it consists of a secondary tension sheath tube 25 formed with two sheath tubes.

The fifth segment E is a part of the branch segment 10, as shown in FIGS. 2 to 4 and 8, and is the last of five segments of a 30 meter girder.

The front part has an "H" shape as the vertical shape and the upper and lower parts are wide and the middle part is a narrow shape. The upper flange haunting part 4 inclined to be narrowed inward and formed in the lower part of the upper flange 3, and the upper planar part. The double hunting portion 7 formed in the lower portion of the support portion 4 and inclined rapidly, the web 2 formed in the lower portion of the double hunting portion 7, and the lower portion of the web 2, are formed on both sides. A lower flange 5 composed of a lower flange chamfer 6 inclined to the outside, a primary tension ash tube 24 having three sheath tubes formed at a predetermined interval on a middle side of the lower flange 5, and the It is provided on one side of the middle of the web (2) and is formed to be inclined downward from the middle portion and is provided with a secondary tension ash sheath pipe (25) formed with two sheath pipes at regular intervals,

The rear flange of the upper flange 3 is composed of an alignment groove 22 having two grooves formed at predetermined intervals, and a shear groove 21 having a groove formed in a ladder shape on one rear surface of the web 2.

On the one side of the middle portion, the web 2 (middle portion) is gradually widened from the front side to the rear side of the web 2, and the rear portion has an upper flange 3 formed on an upper portion, and a lower portion of the upper flange 3. It is formed in a rectangular shape on the lower middle of the lower flange 5, the first tension ash sheath tube 24 formed with three sheath tubes at regular intervals, and is formed on one side in the middle of the web (2) It can be seen that the secondary tension sheath tube 25 formed with two sheath tubes at intervals.

As described above, the present invention can shorten the air because the segment can be manufactured in parallel with the construction of the substructure through precast segmentation, and since the segment is manufactured at the factory, the quality is assured, and the concrete design strength of the girder is 500kg / cm ² can be fully realized, and there is sufficient curing period from the time of construction to the construction of the segment, so there is little deformation after construction due to dry shrinkage and creep, and the manufacturing cost of the girder is low, Tension can be adjusted by additional tension, and factory construction through segmentation can reduce the site of construction site, reduce girder height, and provide 30m 5-segment Bulb-Tee girder to provide 30m bridge construction and economic feasibility. There is an effect to improve.

Claims (9)

In the construction method using the five-segment segment bulb tea girder, First process (manufacturing five-segment segmental bulb-tee girder) The first segment (A), the second segment (B), the third segment (C), the fourth segment (D), and the fifth segment (E), respectively, in the form of five segments of the girder at the factory. After forming a conventional formwork and molded in a conventional manner with steel mortar or reinforcement containing cement mortar, and after a certain curing period, demolding from the formwork to produce each 5-segment segmental bulb-tee girder, 2nd process (manufacture of 5 segment segmental bulb-tee girder) Each of the five segmented segmental bulb-tee girders manufactured in the first process, that is, the first segment A, the second segment B, the third segment C, and the fourth segment D) and the fifth segment E are transported to the construction site, the shear key 11 and the alignment key 12 formed at one segment at the construction site have shear grooves of other neighboring segments ( 21) and the alignment groove 22, the first segment (A), the second segment (B), the third segment (C), the fourth segment (D) and the fifth segment (E) After assembling into one, and then assembled into one girder, by inserting the primary tension member 14 in the primary tension ash sheath tube 24 formed in the lower portion of each segment to tension, to integrate each girder, 3rd process (finishing process) After mounting a plurality of girders integrated as in the second step to the piers using a temporary equipment, after placing the bottom plate 1 on the girder and curing, the secondary tension ash formed on the bracket 13 of the girder After the secondary tension member 15 is inserted into the secondary tension ash sheath tube 25 formed at the upper and lower portions of the pipe and each segment of the assembled parts, the assembled girder is subjected to secondary tension, and then subjected to a predetermined curing period, and then the bottom plate 1 Construction method using the five-segment segment bulb tea girder, characterized in that the bridge is constructed using a five-segment segment bulb-tee girder by constructing an asphalt pavement and other attached facilities on the upper part of). The method of claim 1, wherein the five segmented parts are assembled into one girder in one side of the first flange (A) of the upper flange (3) with two grooves formed at regular intervals in the alignment groove (22). And, in the front end side of the upper flange (3) of the upper flange (3) of the second segment (B) in the front end groove 21 is formed in the ladder-shaped groove on one side of the rear side of the web (2) alignment Alignment key (12) and the shear key (11) protruding in a ladder shape on one side of the rear side of the web (2) by inserting, respectively, An alignment groove 22 having two grooves formed at a predetermined interval on a rear side of the second segment B upper flange 3, and a shear groove having a groove formed in a ladder shape at one side of the rear surface of the web 2. 21, an alignment key 12 having two protrusions formed at a predetermined interval on the front side of the upper flange 3 of the third segment C, and a ladder shape at the rear side of the web 2; Insert and connect the shear key 11 protruded into each other, An alignment key 12 having two protrusions formed at a predetermined interval on a rear side of the upper flange 3 of the third segment C and a ladder protruding on one side of the rear side of the web 2. The front end key 11 is an alignment groove 22 having two grooves formed at a predetermined interval on the rear side of the upper flange 3 of the fourth segment D, and a groove formed in a ladder shape on the rear side of the web 2. Inserted into the formed shear groove 21 and connected, An alignment key 12 having two protrusions formed at a predetermined interval on a rear side of the upper flange 3 of the fourth segment D and a ladder protruding on one side of the rear side of the web 2. The front end of the upper flange (3) of the fifth segment (E) and the alignment groove (22) formed with two grooves at regular intervals, and a ladder shape on one side of the rear surface of the web (2) Construction method using a five-segment segmental bulb tea girder, characterized in that the insert is connected to the shear groove 21 formed with grooves to be assembled as one girder The tension of the assembled girder is tensioned by inserting a primary tension member 14 in the primary tension ash sheath tube 24 formed at the lower portion of each segment, thereby integrating each girder, and then assembling the assembled girder. After pouring and hardening the bottom plate (1) on the upper portion of the secondary tension ash tube formed on the bracket 13 of the girder and the secondary tension ash tube (25) formed on the upper and lower portions of each segment of the secondary tension material ( 15) Construction method using a five-segment segment bulb tea girder, characterized in that the girder assembled by inserting a second tension. In the five-segment segmental bulb-tee girder for bridges, the upper flange (3) is 120 cm wide, the thickness is 10 cm, the haunches (4) the width and thickness are 42.5 / 10 cm, and the web (2) is 25 cm wide. The width of the lower flange 5 is 90cm, the thickness is 20cm, the width and thickness of the haunches 6 are 32.5 / 15cm, the girder is composed of 5 segments of 120cm in height and 30m in total length. A first segment portion A, a second segment portion B formed on the rear surface of the first segment portion A, and a third segment portion C formed on the rear surface of the second segment portion B. And a fourth segment portion D formed on the rear surface of the third segment portion C, and a fifth segment portion E formed on the rear surface of the fourth segment portion D. 5-segment segment bulb tea girder for bridge The method according to claim 4, wherein the first segment (A) is a part of the branch segment (10), the first of the five segments of the 30-meter girder, the front of the web (2) (from the front to the rear) ) Is an inclined (narrowing) shape, the front portion is formed in the upper flange (3) formed in the upper portion, and a rectangular shape in the lower portion of the upper flange (3), A bracket 13 protruding from the grooves formed on both sides of the web 2 inclined to one side of the middle part and provided with a secondary tension ash tube 25; The rear end is "H" shaped vertically, the upper and lower parts are wide, the middle part is narrow shape, An upper flange hunt portion 4 formed on the lower portion of the upper flange 3 and inclined to be narrowed inward, a double hunt portion 7 formed on the lower portion of the upper flange hunt portion 4 and inclined rapidly; A lower flange 5 formed of a web 2 formed at a lower portion of the double hunt portion 7, a lower flange hunt portion 6 formed at a lower portion of the web 2, and inclined outwardly on both sides, and the The middle tension side of the lower flange 5 is provided with a primary tension ash tube 24 formed with three sheath tubes at a predetermined interval, and is provided on the middle one side of the web 2 and formed to be inclined downward from the middle portion at regular intervals. It is provided with a secondary tension ash sheath pipe 25 formed with two sheath pipes, The rear flange of the upper flange (3) consists of an alignment groove (22) formed with two grooves at a predetermined interval, and a shear groove (21) formed with a groove in a ladder shape on the rear surface of the web (2). A 5-segment segmental bulb tea girder for bridges. The upper flange according to claim 4, wherein the upper and lower portions of the second segment portion B (B) have a vertical shape, and the middle portion is narrow and the middle portion is narrow, and is formed on the lower portion of the upper flange 3 and inclined to narrow inward. The haunch portion 4, the double haunch portion 7 which is formed in the lower portion of the upper flange haunch portion 4 inclined rapidly, the web 2 formed under the double haunch portion 7, and the web ( It is formed in the lower part of 2), is provided with a lower flange (5) consisting of the lower flange chamfer (6) inclined to both sides, two projections at a predetermined interval on the front side of the upper flange (3). It is composed of an alignment key (Alignment key 12) formed, and a shear key 11 protruding in a ladder shape on one side of the rear surface of the web (2), An alignment groove 22 having two grooves formed at a predetermined interval on the rear side of the upper flange 3, a shear groove 21 having a groove formed in a ladder shape on the rear side of the web 2, and the lower flange. (5) the middle tension side is provided with a primary tension ash sheath tube 24 formed with three sheath pipes at a predetermined interval, and is provided on the middle one side of the web (2) and formed inclined from the middle portion to the lower portion and two at regular intervals. 5-segment segment bulb tea girder for bridges, characterized in that the sheath pipe is formed of a secondary tension ash sheath pipe (25) The upper flange haunting portion (4) according to claim 4, wherein the third segment (C) is located at the center of the girder and is a general type II segment, which is formed at the lower portion of the upper flange (3) and is inclined to narrow inwardly. And a double hunting portion 7 formed on the lower portion of the upper flange hunt portion 4 and inclined rapidly, a web 2 formed on the lower portion of the double hunt portion 7, and a lower portion of the web 2. It is formed, and is provided with a lower flange (5) consisting of the lower flange chamfer 6 inclined to both sides, An alignment key 12 having two protrusions formed at predetermined intervals on one side of the front and rear surfaces of the upper flange 3, and a shear key 11 protruding in a ladder shape on one side of the rear surface of the web 2. It is The middle tension side of the lower flange (5) is formed between three primary sheath tube formed with three sheath tube at a predetermined interval, and two sheaths formed at regular intervals spaced up and down between the primary tension ash tube (24). 5-segment segment bulb tea girder for bridges, characterized in that the tube is formed of a secondary tension ash sheath tube (25). The method according to claim 4, wherein the fourth segment (D) is a general I-type segment (8) having a second segment (B) symmetrical shape, the upper and lower portions are wide, the middle portion is narrow shape with the "H" shape vertically , An upper flange hunt portion 4 formed on the lower portion of the upper flange 3 and inclined to be narrowed inward, a double hunt portion 7 formed on the lower portion of the upper flange hunt portion 4 and inclined rapidly; It is provided with a web (2) formed on the lower portion of the double hunt portion (7), and a lower flange (5) formed on the lower portion of the web (2), consisting of lower flange chamfer (6) inclined outwardly on both sides And an alignment groove 22 having two grooves formed at a predetermined interval on a front side of the upper flange 3, a shear groove 21 having a groove formed in a ladder shape on one side of the rear surface of the web 2, and the The rear side of the upper flange 3 is provided with an alignment key (Alignment key 12) formed with two protrusions at a predetermined interval, and a shear key 11 protruding in a ladder shape on the rear side of the web (2), The middle tension of the lower flange (5) is provided with a primary tension ash tube 24 formed with three sheath tubes at a predetermined interval, and is provided on the middle one side of the web (2) and formed to be inclined from the middle portion to the upper portion at regular intervals. Five-segment segment bulb tea girder for the bridge, characterized in that consists of a secondary tension ash sheath pipe 25 formed with two sheath pipes The method according to claim 4, wherein the fifth segment (E) is a part of the branch segment 10, the last part of the five segments of 30 meters girders, The front portion has an "H" shape in the vertical direction, the upper and lower portions are wide, the middle portion is a narrow shape, and formed on the lower portion of the upper flange 3 and the upper flange haunting portion 4 inclined to be narrowed inwardly, and the upper planar portion. The double hunting portion 7 formed in the lower portion of the support portion 4 and inclined rapidly, the web 2 formed in the lower portion of the double hunting portion 7, and the lower portion of the web 2, are formed on both sides. A lower flange 5 composed of a lower flange chamfer 6 inclined to the outside, a primary tension ash tube 24 having three sheath tubes formed at a predetermined interval on a middle side of the lower flange 5, and the It is provided on one side of the middle of the web (2) is formed to be inclined downward from the middle portion and is provided with a secondary tension ash sheath pipe 25 formed with two sheath pipes at regular intervals, The rear flange of the upper flange 3 is provided with an alignment groove 22 having two grooves formed at predetermined intervals, and a shear groove 21 having a groove formed in a ladder shape at one rear surface of the web 2. On the one side of the middle portion, the web 2 (middle portion) is gradually widened from the front side to the rear side of the web 2, and the rear portion has an upper flange 3 formed on an upper portion, and a lower portion of the upper flange 3. It is formed in a rectangular shape on the lower middle of the lower flange 5, the first tension ash sheath tube 24 formed with three sheath tubes at regular intervals, and is formed on one side in the middle of the web (2) 5-segment segment bulb tea girder for bridges, characterized in that it consists of secondary tension sheath pipes 25 having two sheath pipes formed at intervals