KR100893876B1 - A lever rule prestressing segment girder and its construction method - Google Patents

Abstract

A pre-stressing segment girder and a construction method thereof are provided to improve the durability and stability of a bridge and increase the associative property of a connection part of segments. A pre-stressing segment girder comprises: a girder part(110) including a first and second segments arranged in left and right side of one or more center segment(113); a segment connection part(120) connecting a gap between of the second segment and a center segment and the gap between of the first segment and the center segment; a first anchorage(131) installed at the lower surface of the first segment; a second anchorage(132) installed at the lower surface of the second segment and a tensile unit(130) giving the tension which is the horizontal direction compressive force to the girder part, connected between the first and the second anchorage.

Description

Prestressing Segment Girder and its Construction Method using Lever Principle

The present invention relates to a prestressing segment girder and a method for constructing the same in more detail, the construction process is simple, no separate tension tool is required, and the construction period is short, saving workability and construction cost, the connection between the segments The present invention relates to a prestressing segment girder and its construction method using a lever principle capable of securing structural safety.

In general, prestressing girders are structures that are manufactured in a factory or workshop by segmenting one girder into several segments, and then joining segments at the construction site of the girder and tensioning the tension member in the longitudinal direction of the girder.

And, in the method of joining the segmented segment, it is common to place the segments at regular intervals in the field and join them by high tension bolts or welding.

The joining method has the advantage that the segment and the connection between the segments are structurally secure. When prestressing is introduced to the girder, the girder must be assembled in the field and then subjected to a complicated process of tensioning and fixing using a separate tension device. Especially in the case of bridges installed on the premise of dismantling, such as temporary bridges, the demolition work is more difficult due to rusting, etc. It is disadvantageous in terms of recycling.

On the other hand, the contact bonding method is a method of manufacturing a girder by simply joining the prefabricated segments without the process of welding steel or tightening bolts in the field. It has the advantage of being significantly shorter and economical in terms of cost.

However, in the case of the contact bonding method, stress concentration may occur due to manufacturing errors, contact shape characteristics, etc. generated during the fabrication of the segment, and the prestressing method after connection is the same as the general bonding method, which causes a complicated work process.

Accordingly, the present invention is to solve the above problems, the purpose of the construction process is simple, the construction period is short, it is possible to save the workability and construction cost, and to secure structural safety for the connection between the segments The present invention provides a prestressing segment girder and its construction method using the lever principle which can introduce tension in a simple way.

As a specific means for achieving the above object, the present invention is a girder including a first, second segments disposed on the left and right sides of at least one central segment;

A segment connecting portion for connecting between the first segment and the center segment and between the second segment and the center segment; And a reinforcement plate having a predetermined length connecting both ends between the first fixing unit provided on the lower surface of the first segment and the second fixing unit provided on the lower surface of the second segment. It provides a prestressing segment girder using the lever principle including a tension portion that imparts tension to the girder to a horizontal compressive force when supported horizontally in contact with the point.

Preferably, the central segment and the first and second segments facing the central segment have square plate-shaped end plates at each end thereof.

More preferably, the end plate has an inclined surface inclined downward at an angle to the outer surface.

More preferably, between the center segment and the pair of end plates facing each other between the first segment and the second segment, a downward open angle is downwardly opened at a predetermined angle by the inclined surface.

More preferably, the downward open angle is set to 1 to 5 degrees.

Preferably, the segment connection portion is formed on the first fixing plate fixed to each side end of the first and second segments, the second fixing plate fixed to the left and right ends of the central segment, respectively, the first and second fixing plate And a fastening member fastened to both ends of the steel bar having a predetermined length inserted into the through hole and the steel bar exposed through the through hole, respectively.

Preferably, the first and second fixing holes may include stoppers fixed to the lower flanges of the first and second segments so that the locking jaws formed at both ends of the reinforcing plate may be caught, and the lower and the left and right flows of the locking jaws may be difficult. It includes a left and right pair of fixing brackets that the upper end is applied to the left and right sides of the flange and the fixing lower plate is assembled to the left and right pair of fixing brackets so that it is difficult to remove the lower portion of the locking step.

More preferably, the first and second fixing holes further include an auxiliary member in contact with the lower surface of the locking jaw on the fixing lower plate.

More preferably, the locking jaw and the stopper are in contact with each other on the basis of the vertical plane.

More preferably, the locking step and the stopper are in contact with each other on the basis of the inclined surface.

Preferably, the central segment is provided with a plurality of 'c' shaped clamps to prevent the lower sagging of the reinforcing plate is connected to the left and right ends of the first and second fixing holes in the middle of the length.

In addition, the present invention provides a girder unit in which the first and second segments are assembled to each other at the left and right ends of the center segment through the segment connection unit.

Raising the central segment by a predetermined height to dispose the first and second segments downwardly in contact with both left and right ends of the central segment to be inclined downward;

Disposing a reinforcement plate having a predetermined length on a lower portion of the girder portion so that both ends thereof are disposed on the lower surfaces of the first and second segments;

 Lowering the girder and placing the first and second segments in contact with a point so as to horizontally arrange the girder so that the first and second segments contact the left and right ends of the central segment and continue in the longitudinal direction; And

When the left and right ends of the girders are horizontally supported in contact with the point, the prestressing segment girder construction method using the lever principle including the step of applying a horizontal tension to the girders by the compressive force that is returned after the reinforcement plate is extended to both sides to provide.

Preferably, the step of arranging the first and second segments downwardly inclined may include an inclined surface formed on an outer surface of an end plate provided at left and right ends of the central segment, and another end installed at each end of the first and second segments. The inclined surfaces formed on the outer surface of the plate contact each other to form an upward open angle between the central segment and the first and second segments.

More preferably, the upward angle of opening is set relatively large as compared to the downward angle of separation formed between the inclined surfaces facing each other when the first and second segments are horizontally contacted at the left and right ends of the center segment.

More preferably, the upward open angle is maintained by a steel rod of a predetermined length provided in the segment connection portion.

Preferably, the step of arranging the reinforcement plate is arranged so that the engaging jaw formed on the left and right ends of the reinforcement plate is caught by the stopper provided on the lower surface of the first and second segments.

More preferably, the stopper and the locking jaw abut on each other with a vertical surface as a boundary.

More preferably, the stopper and the locking step abut on each other with the inclined surface as a boundary.

Preferably, the step of placing the girder horizontally when the end plate provided at the left and right ends of the center segment and the end plate provided at each end of the first segment, the first segment, the second segment Tightening the fastening members fastened to the left and right ends of the steel rod penetrating the first fixing plate and the second fixing plate fixed to the center segment in the tightening direction to be in close contact with the first and second fixing plate.

Preferably, the step of placing the girder horizontally is a pair of fixing brackets on the left and right sides of each of the lower flanges of the first and second segments so that the upper end is covered, and then fixed to the lower portion as a plurality of fastening members Assemble by fastening the bottom plate.

More preferably, the step of placing the girder horizontally further comprises the step of placing an auxiliary member between the fixing lower plate and the stopper in contact with the lower surface of the locking jaw caught by each stopper of the first and second segments. .

Preferably, the step of placing the girder horizontally further comprises the step of installing a plurality of '' 'clamp to prevent the lower sag of the reinforcement plate between the reinforcement plate and the girder.

According to the present invention, there is provided a segment connecting portion for connecting between the first segment and the central segment and between the second segment and the central segment, the first fixing unit provided on the lower surface of the first segment, and the lower surface of the second segment. The girder segmented into a plurality of segments is provided with a reinforcing plate connected at both ends between the second fixing unit and the second girder, which is provided with a tension force that is a horizontal compressive force when the left and right ends of the girder are horizontally supported in contact with the point. Since the construction process integrated into one structure can be constructed on site within a short time, the air can be shortened and construction costs can be reduced. In addition, prestressing using the principle of lever can be easily introduced into the girder by the plate installed on the lower surface, so it is possible to construct a bridge between long and long spans in an economical cross section.

In addition, since structural safety can be secured with respect to the connection portion between the segments, the effect of improving the durability and safety of the girder and the bridge using the same can be obtained.

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

1 is an overall configuration diagram showing a prestressing segment girder using the lever principle according to a preferred embodiment of the present invention, Figure 2 is a segment connection portion provided in the prestressing segment girder using the lever principle according to a preferred embodiment of the present invention 3 is a view illustrating a first segment provided in a prestressing segment girder using a lever principle according to a preferred embodiment of the present invention, wherein a) is a side view of the first segment, and b) is a view of FIG. 3. (a) is a front view as seen along line AA, c) is a front view as seen along line BB in FIG. 3 (a), d) is a detailed view of part C in FIG. 3 (a), and FIG. As shown in the tension portion provided in the prestressing segment girder using the lever principle according to the preferred embodiment of the present invention, a) is a configuration of the connection portion provided in the first segment (B) is a front view seen along the DD line of Figure 4 (a), c) is a front view along the EE line of Figure 4 (a), Figure 5 is a lever principle according to a preferred embodiment of the present invention FIG. 6 is an exploded perspective view of first and second anchoring holes provided in the prestressing segment girder using the lever principle according to a preferred embodiment of the present invention. FIG. 7 shows a state of engagement between the stopper and the reinforcement plate in the prestressing segment girder using the lever principle according to the preferred embodiment of the present invention, a) is a vertical contact state, and b) is a boundary contact state.

As shown in FIG. 1, the girder 100 according to the preferred embodiment of the present invention includes a girder 110, a segment connection part 120, and a tension part 130.

As shown in FIGS. 1 and 2, the girder 110 includes a plurality of segments 111, 112, and 113, and the girder 110 includes a central segment 113 disposed in the center region of the girder, and First and second segments 111 and 112 are disposed on the left and right sides, respectively.

The center segment 113 and the first and second segments 111 and 112 have an I-type or H-shaped beam shape including a web 13 perpendicular between the upper flange 11 and the lower flange 12 on a horizontal flat plate. Made of steel member.

Here, the center segment 113 is illustrated and described as being provided with a member having a relatively long length compared to the first and second segments 111 and 112, but the present invention is not limited thereto.

In addition, the left and right ends of the center segment 113 and the end portions of the first and second segments 111 and 112 facing the square end are formed in contact with the upper and lower flanges 11 and 12 and the web 13 to be fixed. Plate 115 is provided.

Here, the outer surface of the end plate 115 which is installed at the left and right ends of the center segment 113 and the outer surface of the other end plate 115 which is installed at each end of the first and second segments 111 and 112 facing the other. Has a slope (115a) inclined downward at a predetermined angle.

Accordingly, the end plates 115 installed at the left and right ends of the center segment 113 and the other end plates 115 installed at each end of the first and second segments 111 and 112 may face each other. In addition, between the end plates 115 and 115 facing each other to form a downward open angle θ that is downwardly opened at a predetermined angle by the inclined surfaces 115a and 115a.

The downward opening angle θ is preferably set to 1 to 5 °, and the downward opening angle may be set differently according to the prestressing force to be applied to the girder to be constructed.

Here, when the downward open angle θ is set to 1 ° or less, there is a limit in integrating the segmented girders because it cannot impart sufficient horizontal compressive force to the girder through the tension portion, whereas the downward open angle When the angle θ is set to 5 ° or more, an excessive prestressing force is applied to the reinforcing plate provided in the tension part, thereby causing the reinforcing plate to be broken or an adjacent component that fixes the reinforcing plate to be damaged, thereby impairing structural safety. .

In addition, the end plates 115 and 115 form a through hole 115a through which a steel rod to be described later is inserted and passed.

As shown in FIGS. 2 and 3, the segment connection part 120 is disposed between the first segment 111 and the center segment 113 and between the second segment 112 and the center segment 113. It is a connecting member to connect.

The segment connection portion 120 is the first fixing plate (121,122) fixed to each side end of the first, second segment (111, 112) and the second fixedly installed on both left and right ends of the center segment 113, respectively. Steel bars 125 having a predetermined length inserted through fixing plates 123 and 124, through holes 121 a and 122 a formed in the first fixing plates 121 and 122, and through holes 123 a and 124 a formed in the second fixing plates 123 and 124, respectively. And fastening members 125a and 125b fastened to both ends of the steel bar 125 that are externally exposed through the through holes 121a, 122a, 123a, and 124a.

In addition, the steel rod 125 passes through the through holes 115b of the end plates 115 respectively installed at both ends of the first and second segments 111 and 112 and at both ends of the central segment 113.

Here, the first and second fixing plates 121, 122, 123, and 124 are welded and fixed to be orthogonal to the upper flanges 11 and the webs 13 of the first and second segments 111 and 112 and the center segment 113, respectively. The first and second segments 111 and 112 may be provided as a metal plate member of a square plate that is welded and fixed to be orthogonal to each lower flange 12 and the web 13 of the central segment 113.

The first and second fixing plates 121, 122, 123, and 124 are installed in symmetrical structures on both left and right sides of the web 13.

In addition, the steel bar 125 is preferably made of a steel member having a tensile force to securely connect between the segment and the segment adjacent thereto.

Accordingly, the first and second segments 111 and 112 and the central segment 113 disposed therebetween are connected by the tensile force of the steel rod until the girder 110 is raised to the points T1 and T2. On the other hand, after the girder 110 is raised to the points T1 and T2, the girder 110 may face each other by the fastening force of the fastening members 125a and 125b fastened to both ends of the steel rod 125. The adhesion between the end plates 115 and 115 is increased to maintain the connection state of the girder 110 continuous in the horizontal direction.

As shown in FIGS. 1 and 4 to 7, the tension unit 130 may include the girder unit when the left and right ends of the girder unit 110 are horizontally supported in contact with the point units T1 and T2, respectively. 110) to give the tension in the horizontal compression force.

The tension unit 130 includes first and second fixing holes 131 and 132, and a reinforcement plate 133 having a predetermined length between both ends thereof.

The first fixing hole 131 is a fixing structure installed in the lower flange 12 which is the lower surface of the first segment 111, the second fixing hole 132 is a lower surface of the second segment 112. It is a fixed structure installed on the lower flange (12).

The first and second fixing holes 131 and 132 are provided on the lower surfaces of the lower flanges 12 of the first and second segments 111 and 112 so that the locking jaws 133a and 133b formed at both ends of the reinforcing plate 133 are caught. A pair of left and right fixing brackets 135 and 135 and an upper end of which the upper and second stoppers 134 and 134 are fixed to contact the upper and lower sides of the lower flange 12 so that the left and right flow of the locking jaws 133a and 133b is difficult. Fixing lower plate 136 is assembled to the left and right pair of fixing brackets (135, 135) so that it is difficult to remove the lower jaw (133a, 133b).

Here, the stoppers 134 and 134 are provided with a width size that is equal to or smaller than the width of each lower flange 12 of the first and second segments 111 and 112 to be welded or not shown to the lower surface of the lower flange 12. By being fastened as a fastening member, it is provided with a square plate-like plate structure which is integrally provided on the lower flange 12.

The left and right pair of fixing brackets 135 and 135 are in contact with the upper surface of the lower flange 12, the upper horizontal surface (135a), and the vertical surface (135b) extending a predetermined length from the outer end of the upper horizontal surface (135a) directly below. And a lower horizontal surface 135c extending horizontally outward from the vertical surface 135b and having a plurality of fastening holes 135d, while a plurality of reinforcing ribs are disposed between the vertical surface 135b and the lower horizontal surface 135c. It is preferable to have 135e.

The fixing lower plate 136 is provided with a plurality of fastening holes 136a coinciding with the fastening holes 135b formed in the lower horizontal surface 135c of the pair of right and left fixing plates 136 and 136. 136b) so as to be detachable.

Here, the fixing lower plate 136 is provided with an auxiliary member 137 in contact with the lower surface of the locking projections 133a and 133b of the stoppers 134 and 134 of the first and second segments. 137 may be assembled to be replaced by a fastening member 136c fastened to the fixing lower plate 136.

In addition, the reinforcing plate 133 is preferably provided with a size equal to or smaller than the width of the lower flange 11 so as not to protrude to the left and right sides of the first and second segments 111 and 112 and the central segment 113. .

Accordingly, the locking jaws 133a and 133b formed on the left and right ends of the reinforcing plate 133 and in contact with the stoppers 134 and 134 may include the pair of fixing brackets 135 and 135, the lower plate 136 for fixing, and the like. The auxiliary member 137 disposed between them may be fixed to the first and second fixing holes 131 and 132 so as to prevent external detachment.

Here, the locking projections 133a and 133b formed at the left and right ends of the reinforcing plate 133 and the stoppers 134 and 134 in contact with the reinforcing plate 133 are shown as being in contact with the vertical plane as shown in FIG. As illustrated in FIG. 7B, the locking jaws 133a and 133b and the stoppers 134 and 134 may be in contact with an inclined surface.

The central segment 113 has a plurality of 'c' shaped clamps 139 to prevent the lower sag of the reinforcing plate 133 connected to the left and right ends of the first and second fixing holes 131 and 132 in the middle of the length. It is preferable to provide.

8 (a) (b) (c) (d) illustrate a process of constructing a prestressing segment girder according to a preferred embodiment of the present invention. As shown in FIG. The girders 110 to which the first and second segments 111 and 112 are temporarily assembled are provided at both left and right ends of the segment 113 through the segment connecting unit 120.

In this case, the girder 110 is a segment connecting portion 120 connecting between the first segment 111 and the central segment 113 and between the second segment 112 and the central segment 113 in the field. The steel rods 125 are assembled through the medium.

In this state, as shown in Figure 8 (b), by using a temporary equipment such as a crane or crane not shown through the wire 10 is connected to the upper flange 111 of the central segment 113 When the girder 110 is raised from the ground by a predetermined height, the first and second segments 111 and 112 disposed on the left and right sides of the center segment 133 are partially in contact with a part of the left and right ends of the center segment 113. It is arranged to be inclined at an angle downward with respect to one central segment 113.

That is, the outer surface of the end plate 115 provided at the left and right ends of the central segment 113 and the outer surface of the other end plate 115 provided at each end of the first and second segments 111 and 112 facing the same. The inclined surface 115a is inclined downward at a predetermined angle, so that the end plates 115 at the left and right ends of the central segment 113 and the other end plates at each end of the first and second segments 111 and 112 facing the same. While maintaining the contact state between the inclined surfaces (115a, 115a) while the remaining portions are separated from each other.

Accordingly, the first and second segments 111 and 112 are inclined downward with respect to the inclined planes 115a and 115a which are in contact with each other, so that the horizontal center segment 113 may be upwardly disposed between the center segment and the first and second segments. The open upward angle α is formed.

In this case, the upward open angle α according to the downwardly inclined state of the first and second segments 111 and 112 is provided in the segment connection part 120 to connect between the central segment and the first and second segments. It can be adjusted by adjusting the overall length of the 125 or by changing the fastening position of the fastening member fastened to both ends of the steel bar, it can be changed according to the forming angle of the inclined surface.

In addition, an upward open angle α formed when the first and second segments 111 and 112 are inclined downward in contact with the left and right ends of the central segment 113 may include the first and second segments at the left and right ends of the center segment. It is preferable to set relatively large compared with the downward spreading angle (theta) formed between the inclined surfaces which mutually face when it contacts horizontally.

This downward opening angle can be set differently according to the prestressing force to be applied to the girder to be constructed, but the target area is 40m, and the reinforcement plate of 30cm wide and 3cm thick is used for the 90cm section steel and 60 tonf prestressing force. If you want to add, the length of the reinforcement plate is about 30m is appropriate. At this time, the elongation amount (δ) of the reinforcing plate is as follows.

δ = AE / PL

δ = 30 X 3 X 2100000 / (60000 X 3000) = 1.05 cm

Where A is the cross-sectional area, E is the elastic modulus, P is the external force, and L is the length.

In addition, the downward spreading angle θ may be calculated by the following Equation 2.

δ / 2 = R [1-cos (θ / 2)]

cos (θ / 2) = 1-δ / (2 X R)

(Where R = distance from the reinforcement plate fixing part to the segment contact part = 1.0 m)

When Equation 2 is calculated, θ = 3.713 ° and the minimum value of 1 ° to 5 ° may be set to an appropriate value in consideration of conditions such as the amount of extension of the reinforcement plate and the distance from the reinforcement plate contact portion to the segment contact portion.

Subsequently, as shown in FIG. 8B, both ends of the stoppers 134 and 134 provided in the downwardly inclined first segment 111 and the stoppers 134 and 134 provided in the downwardly inclined second segment 112. Place the reinforcement plate 133 of a predetermined length in the lower portion of the girder 110 so as to take each.

That is, when the center segment 113 is raised, the stopper 134 installed on the lower flange of the first segment 111 inclined downward by partially contacting the inclined surface of the end plate at both side ends thereof, so that the reinforcing plate 133 The catching jaw 133a formed at one side end is caught, and the stopping step 133b formed at the other end of the reinforcing plate 133 is attached to the other stopper 134 installed on the lower flange of the downwardly inclined second segment 112. By taking this, the reinforcing plate 133 is arranged horizontally with a predetermined interval in the lower portion of the girder.

At this time, since the forming length of the reinforcing plate 133 is designed and set in advance in consideration of the angle of the upward opening angle, it is necessary to adjust the length of the reinforcing plate to arrange the reinforcing plate 133 in the girder. The operator can perform it easily, quickly and accurately.

In addition, the stoppers 134 and 134 and the latching jaws 133a and 133b may be in contact with each other, as shown in FIG. As shown in Fig. 1, the inclined surfaces may be in contact with each other.

In this state, as shown in FIG. 8C, when the girder portion having a predetermined height is lowered and the first and second segments 111 and 112 are placed to be in contact with the points T1 and T2, the center segment ( The first and second segments 111 and 112 which are inclined downward on the left and right sides of the 113 are naturally brought into contact with the left and right ends of the center segment 113 by their own weight, and are converted to a horizontal state so that the girder 110 is in the longitudinal direction. It is arranged horizontally so as to be continuous.

In succession, when one end of each of the first and second segments 111 and 112 is in contact with the left and right ends of the central segment 113, the fastening members fastened to the left and right ends of the steel rod 125 in the tightening direction to tighten the first and second segments. The fastening members are brought into close contact with the first fixing plates 121 and 122 fixedly installed at one end of each of the two segments, and the second fixing plates 123 and 124 respectively fixed to the left and right ends of the central segment.

Accordingly, the contact between the center segment 113 and the first and second segments 111 and 112 is between the left and right ends of the center segment 113 and the end plates 115 provided at the ends of the first and second segments 111 and 112. It is made by an interview, and the interview state between them is made firmly by the steel rod 125 and the fastening member fastened thereto.

In addition, the locking state in which the locking jaw is hung on each stopper of the first and second segments may include a pair of fixing brackets arranged on the left and right sides of each of the lower flanges of the first and second segments 111 and 112 so that an upper end thereof is extended. Next, by fastening and assembling the lower plate for fixing as a plurality of fastening members to the lower portion, the locking jaw and the stopper are held so that the left and right flow of the locking jaw caught by the stopper and the lower detachment are difficult.

In addition, the fixing lower plate 136 has an auxiliary member 137 contacting the lower surfaces of the locking projections 133a and 133b fixed to the respective stoppers of the first and second segments. ) May be inserted between the locking jaw and the locking step.

On the other hand, since the reinforcement plate 133 on which the left and right ends are hung on the stoppers 134 and 134 is elongated to the left and right sides by the external force P1 in the vertical direction due to the weight of the segment, the reinforcement plate 133 is formed. The length L2 has a relatively long length compared to the length L1 of the reinforcing plate in which both ends are hung between the first and second segments inclined downward on the left and right sides of the center segment.

Accordingly, as shown in FIG. 8 (d), the reinforcement plate 133 generates a compressive force P corresponding to a return force to return to the original state by the length extended to both sides. Is to provide a tension force of a certain strength toward the center direction of the girder 110.

For this reason, the girder 110 may further improve structural safety between segments by the tension provided by the reinforcing plate 133 and at the same time may integrate the segmented segment into one girder.

In addition, between the reinforcement plate 133 and the girder portion 110 to provide a constant strength of the force toward the center of the girder 110, the 'c' shaped clamp to prevent the lower sagging of the reinforcement plate A plurality of (139) is provided.

On the other hand, the girder 110 is constructed so as to provide a tension force by the reinforcement plate as described above in a plurality of pier in the width direction to the piers corresponding to the points (T1, T2), and then, the upper portion of the girder 110 By placing concrete on the upper flange, the bottom plate is constructed, and by using asphalt pavement and attached facilities on top of the bottom plate, the bridge using the segment segment girder can be constructed.

While the invention has been shown and described with respect to particular embodiments, it will be appreciated that the invention can be varied and modified without departing from the spirit or scope of the invention as set forth in the claims below. It will be appreciated that those skilled in the art can easily know.

1 is an overall configuration diagram showing a prestressing segment girder using the lever principle according to an embodiment of the present invention.

2 is a block diagram illustrating a segment connection portion provided in the prestressing segment girder using the lever principle according to the preferred embodiment of the present invention.

FIG. 3 illustrates a first segment provided in the prestressing segment girder using the lever principle according to the preferred embodiment of the present invention.

a) is a side view of the first segment,

b) is a front view taken along the line A-A of FIG. 3 (a),

c) is a front view taken along the line B-B in FIG. 3 (a), and d) is a detailed view of the C portion in FIG. 3 (a).

Figure 4 illustrates a tension portion provided in the prestressing segment girder using the lever principle according to an embodiment of the present invention,

a) is a configuration diagram of the connection part provided in the first segment,

b) is a front view taken along the line D-D of FIG. 4 (a),

c) is a front view taken along the line E-E of FIG.

5 is an installation state diagram of the first and second anchoring holes provided in the prestressing segment girder using the lever principle according to the preferred embodiment of the present invention.

6 is an exploded perspective view of the first and second anchoring holes provided in the prestressing segment girder using the lever principle according to the preferred embodiment of the present invention.

7 is a view showing a state of engagement between the stopper and the reinforcement plate in the prestressing segment girder using the lever principle according to the preferred embodiment of the present invention.

a) is the vertical contact state,

b) is the interface contact.

8 (a) (b) (c) (d) are schematic views illustrating a process of constructing a prestressing segment girder using a lever principle according to a preferred embodiment of the present invention.

   Explanation of symbols on the main parts of the drawings

110: girder 111: first segment

112: second segment 113: center segment

120: segment connection 121 122: first fixing plate

123,124: 2nd fixed plate 125: steel bar

130: tension portion 131: first stop

132: second anchoring hole 133: reinforcement plate

135: fixing bracket 136: fixing lower plate

137: auxiliary member 139: clamp

T1, T2: Branch

Claims (24)

A girder including first and second segments disposed at left and right sides of at least one central segment; A segment connecting portion for connecting between the first segment and the center segment and between the second segment and the center segment; And A left and right ends of the girder are provided with a reinforcement plate having a predetermined length connecting both ends between a first fixing unit provided on the lower surface of the first segment and a second fixing unit provided on the lower surface of the second segment. A prestressing segment girder using a lever principle comprising a tension portion that provides a tension force that is a horizontal compressive force to the girder when supported horizontally in contact with the girder. 2. The prestressing segment girder according to claim 1, wherein the center segment and the first and second segments facing each other have a square plate end plate at each end. 3. The prestressing segment girder according to claim 2, wherein the end plate has an inclined surface inclined downward at an angle on an outer surface thereof. According to claim 2, Between the central segment and the pair of end plates facing each other between the first segment and the second segment is provided with a downward opening angle downwardly opened at a predetermined angle by the inclined surface Prestressing segment girder using the lever principle. 5. The prestressing segment girder according to claim 4, wherein the downward opening angle is set to 1 to 5 degrees. The method of claim 1, wherein the segment connecting portion is a first fixing plate fixed to each side end of the first and second segments, a second fixing plate fixed to the left and right ends of the center segment, respectively, and the first and second A prestressing segment girder using the lever principle, characterized in that it comprises a fastening member which is fastened to both ends of a steel rod of a predetermined length inserted into the through-hole formed in the fixing plate and both ends of the steel bar exposed through the through-hole. The stopper of claim 1, wherein the first and second fixing holes are fixed to the lower flanges of the first and second segments so that the locking jaws are formed at both ends of the reinforcing plate. And a pair of fixing brackets which are assembled to the pair of fixing brackets so that the upper and lower pairs of fixing brackets are spread across the left and right sides of the lower flange so that the lower part of the locking jaw is difficult to escape. Prestressing segment girder using the principle. 8. The prestressing segment girder according to claim 7, wherein the first and second fixing holes further include an auxiliary member contacting the lower surface of the locking jaw on the fixing lower plate. 8. The prestressing segment girder according to claim 7, wherein the catching jaw and the stopper are in contact with each other with a boundary of a vertical plane. 8. The prestressing segment girder according to claim 7, wherein the catching jaw and the stopper are in contact with each other with respect to an inclined surface. The lever of claim 1, wherein the center segment has a plurality of 'c' shaped clamps to prevent the lower sag of the reinforcing plate connected to the left and right ends of the first and second fixing holes in the middle of the length. Prestressing segment girder using delete Providing girders in which the first and second segments are assembled to each other at the left and right ends of the central segment through the segment connecting portion. Raising the central segment by a predetermined height to dispose the first and second segments downwardly in contact with both left and right ends of the central segment to be inclined downward; Disposing a reinforcement plate having a predetermined length on a lower portion of the girder portion so that both ends thereof are disposed on the lower surfaces of the first and second segments;  Lowering the girder and placing the first and second segments in contact with a point so as to horizontally arrange the girder so that the first and second segments contact the left and right ends of the central segment and continue in the longitudinal direction; And And applying horizontal tension to the girder by the compressive force returned after the reinforcement plate is extended to both sides when the left and right ends of the girder are horizontally supported in contact with the point. 15. The method of claim 13, wherein the step of arranging the first and second segments downwardly inclined is formed on the inclined surface formed on the outer surface of the end plate is installed on the left and right ends of the central segment, and installed at each end of the first and second segments. Prestressing segment girder construction method using the lever principle, characterized in that the inclined surfaces formed on the outer surface of the other end plate is in contact with each other to form an upwardly open upward angle between the center segment and the first and second segments. 15. The method of claim 14, wherein the upward open angle is set relatively large compared to the downward open angle formed between the inclined surfaces facing each other when the first and second segments are horizontally in contact with the left and right ends of the central segment. Prestressing segment girder construction method using lever principle. 15. The method of claim 14, wherein the upward open angle is maintained by a steel rod having a predetermined length provided in the segment connection portion. 15. The method of claim 13, wherein the step of arranging the reinforcement plate is arranged horizontally so that the latching jaw formed on the left and right ends of the reinforcement plate is caught on the stopper provided on the lower surface of the first and second segments. Prestressing segment girder construction method using the lever principle characterized in that.  18. The method of claim 17, wherein the stopper and the locking jaw are in contact with each other with a vertical surface as a boundary. The prestressing segment girder construction method according to claim 17, wherein the stopper and the locking jaw are in contact with each other with a slope as a boundary. 15. The method of claim 13, wherein the placing of the girders horizontally includes the first plates when the end plates provided at the left and right ends of the center segment and the end plates provided at each end of the first and second segments are interviewed. And tightening the fastening members fastened to the left and right ends of the steel rods penetrating the second fixing plate fixed to the second segment and the second fixing plate fixed to the central segment in the tightening direction to closely adhere to the first and second fixing plates. Prestressing segment girder construction method using lever principle. 15. The method of claim 13, wherein the step of placing the girder horizontally comprises a pair of fixing brackets arranged on the left and right sides of each of the lower flanges of the first and second segments so as to extend the upper and lower ends thereof, A prestressing segment girder construction method using the lever principle, characterized in that the fixing lower plate is assembled as a member. 22. The method of claim 21, wherein the placing of the girder horizontally further comprises disposing an auxiliary member between the fixing lower plate and the stopper, which is in contact with the lower surface of the locking jaw caught by each stopper of the first and second segments. Prestressing segment girder construction method using the lever principle characterized in that it comprises a. The method of claim 13, wherein the placing of the girder horizontally further comprises installing a plurality of 'c' shaped clamps between the reinforcing plate and the girder to prevent the sagging of the reinforcing plate. Prestressing segment girder construction method using lever principle. delete

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