KR20130003868A - Tention typed cable-stayed bridge construction method - Google Patents

Abstract

PURPOSE: A construction method of a tension type single span cable-stayed bridge is provided to cost-efficiently construct a cable-stayed bridge by changing compressive force applied to a girder into tensile force. CONSTITUTION: A construction method of a tension type single span cable-stayed bridge is as follows. First deck segments are installed to be directly supported to two towers(110) separated from each other using inclined cables. Multiple deck segments are consecutively installed on the first deck segments using additional inclined cables. When the deck segments to be connected to each other are adjacent to each other, jacks(200) are installed between the towers and the first deck segments. Key segments(400) are arranged between the deck segments to be connected to each other, and the installed jacks are powered to continuously connect the deck segments to each other. Tensile force is applied to the connected deck segments. [Reference numerals] (AA) First step; (BB) Second step; (CC) Third step; (DD) Fourth step

Description

Construction method for short span tensile cable-stayed bridge {TENTION TYPED CABLE-STAYED BRIDGE CONSTRUCTION METHOD}

The present invention relates to a method for constructing a short span cable-stayed bridge, and more specifically, to convert the compressive force acting on the girder into a tensile force in a short span cable-stayed bridge in which a girder is suspended by an inclined cable between both main towers (main span). The present invention relates to a short span tensile cable-stayed bridge construction method that enables the construction of a cable-stayed bridge more economically.

In general, the cable-stayed bridge is a bridge that supports the main span by using the inclined cable installed in the inclined direction from the pylon.

Since the cable-stayed bridge can lengthen the main span, it is recently installed in rivers and seas with wide widths.

The cable-stayed bridge is installed on both sides of the sequential deck (segment) in order to make the main span (Span) and side span (Side Span), but using the inclined cable so that the deck segment between the main span and the side span are connected to each other.

Accordingly, the compressive force acts in the horizontal direction on the deck segments on both sides connected to each other.

That is, as shown in FIG. 1A, since the inclined cable 1 connects the deck segments 2 on both sides of the main column 3 to each other, the horizontal component F21 is the deck segment 2 among the forces acting on the inclined cable 1. ) Acts as a compressive force and the vertical component force F11 acts upward.

The compressive force is maximized at the place (M) where the main tower (3) is installed and zero (hinge connection) at the center point (C) of the main span (Main Span).

This is because the compressive force acting as the installation of the deck segment 2 from the pylon starts to accumulate and increase in the deck segment 2.

Accordingly, the maximum compressive force acting on the deck segment 2 increases in proportion to the length L between the main spans, that is, the distance between the main towers 3.

1B is a graph showing the relationship between the maximum compressive force and the main span length L, and is made under the assumption that the cross-sectional area of the deck segment 2 between the main spans is constant.

That is, for example, it can be seen that the maximum compressive force of 160 MPa when the length L of the main span is 1000 m is 500 MPa when the length L of the main span becomes 2000 m.

Accordingly, in order to cope with such an increase in compressive force, the deck segment 2 has a problem of using high strength steel or increasing the cross-sectional area.

In addition, the deck segment made of steel requires a lot of local buckling materials such as stiffeners to compensate for buckling and / or twisting due to compressive force, and the weight of the deck segment must increase due to the use of such local buckling materials. There was a problem that the construction cost of the cable-stayed bridge is increased by the manufacturing and installation costs.

Figure 1c shows an example of a conventional short span cable-stayed bridge.

That is, in the case of the short span cable-stayed bridge 10, both sides of the main column 11 are asymmetrical as there is no side span as shown in FIG.

Therefore, according to the prior art, the load corresponding to the vertical component force F11 of the girder 12 (the deck segments connected to each other) is supported by the inclined cable 13, and the axial force F1 of the girder 12 ) Is constructed so that the main column 11 to which the girder 12 is rigid is supported.

As a result, the main tower 11 receives the vertical vertical force F2 by the plurality of inclined cables 13 across the top, and simultaneously receives the horizontal axial force F1 from the girder 12 that is rigidly tightened to the lower portion.

In the short span cable-stayed bridge 10 according to the prior art, the main column 11 has a horizontal axial force (F3) generated in the upper portion over which the inclined cable 13 spans, and an axial force (F1) in the lower portion where the girder is hardened. Due to the bending moment is bent in a bow shape to have an unstable structure, the base 14 of the pylon should be designed to be very large to resist the bending moment caused by the axial forces (F1) of the girder, so As a result, the economy was inferior.

Short span cable stayed bridges for overcoming the shortcomings of the short span cable stayed bridges are introduced in FIGS. 1D and 1E.

That is, in the short span cable-stayed bridge supporting the girder 12 extending to one side of the main column 11 with the inclined cable 13, the main column 11 and the girder 12 are separated from each other, The axial force F1 is provided in the anchorage block 15 so as to be supported by the reaction wall 16 supporting the end of the girder (reaction action).

Thus, by separating the girder and the pylon to remove the axial force (F1) transmitted from the girder, to reduce the bending moment generated in the pylon to have the effect of increasing the safety of the pylon.

Therefore, the foundation block 14 of the pylon does not need to be excessively large, so that economic efficiency may be obtained.

On the other hand, when the reaction force wall 16 receiving the axial force (F1) of the girder is formed in the anchorage block 15, the side force of the girder and the axial force of the anchorage block are canceled to have an effect of further increasing the safety of the short span cable-stayed bridge. .

However, the fundamental problem in the short-span cable-stayed bridge is that as the compressive force accumulates in the girders, the cross section of the girders increases and the weight of the deck segment increases due to the use of local buckling prevention materials. The construction cost of the cable-stayed bridge is increased.

Therefore, it can be seen that reducing the axial force, which is a compressive force acting on the girder, has a very important meaning in the conventional short span cable-stayed bridge.

Thus, the distribution of the compressive force (F1) acting on the girder of the conventional short span cable-stayed bridge is as follows with reference to Figure 1f.

That is, according to FIG. 1f, it can be seen that the compressive force is very large at both ends over the main span and the compressive force is not generated by the hinge connection at the center portion.

Therefore, the conventional short span cable-stayed bridge also has a structure in which the compressive force dominates the cross section of the girder over the main span, similarly to the multi-span cable-stayed bridge, and as the main span increases, the cross-sectional area of the girder which is governed by the compressive force becomes large. It is still pointed out that reinforcement problems to prevent local buckling always arise.

The present invention is designed to solve the above problems.

An object of the present invention is to provide a local buckling prevention material for resisting local buckling by the compressive force by inducing the optimization of the deck segment cross-sectional design in the manufacture of the deck segment that is supported by the inclined cable in the main span in the construction of the short span cable-stayed bridge It can be said to build a more economical short span cable-stayed bridge through minimization.

Therefore, the short span cable-stayed bridge according to the present invention can be constructed with a longer span (longer length) cable stayed bridge if the same deck segment cross section, and the economical deck segment cross section can be more economical if the same span length (main span) is possible. It is a technical problem to be solved that it is possible to provide a short span tensile cable-stayed bridge.

As described above, in the existing short span cable-stayed bridge, the maximum compressive force is generated where the pylon is located, and the maximum compressive force increases as the length of the main span becomes longer.

Accordingly, as the length of the main span increases, the cross section of the main segment between the main span increases in order to reinforce the cross section of the deck segment between the main span, or the length of the main span increases due to the use of high strength steel to prevent local buckling. If the economics of the cable-stayed bridge will fall.

The present invention

A first step of installing the first deck segment by using an inclined cable so as to be directly supported by both main towers spaced apart from each other in the axial direction;

A second step of installing a plurality of deck segments in the first deck segment by using a plurality of consecutively inclined cables to a central portion C of the main span;

When the deck segments to be connected to each other in the main span center portion C are adjacent to each other, a jack is installed between the main tower and the first deck segment, and a key segment is disposed between the deck segments to be connected to each other, and the jack is operated to be connected to the deck segment to be connected. A third step of sequencing the deck segment by tightly connecting each other when the segment approaches; And

Tensile type short span including a fourth step to gradually restore the jack installed between the main tower and the first deck segment to the state before operation so that the main tower opened in the opposite direction to the center of the main span is moved toward the center of the main span, the tensile force is introduced to the connected deck segment. It will provide the construction method of the cable-stayed bridge.

That is, the present invention allows the main tower directly resists the accumulated compressive force acting on the deck segment through the jack installed between the deck segment and the main tower so that the main tower is opened in the opposite direction to the center of the main span, and the jack is gradually restored. As the pylon moves back toward the center of the main span, the compressive force is canceled by introducing a tension force into the deck segment through the jack.

In addition, by using the axial damper additionally installed between the deck segment and the main column to ensure the safety of the deck segment and resistance to earthquake loads in the construction process,

By installing a link shoe to control the side reaction force while controlling the longitudinal behavior of the deck segment, it was possible to secure sufficient safety and economics in the construction of a short span long cable-stayed bridge between long spans.

Short span tensile cable-stayed bridge according to the present invention

First, in the case of the conventional short span cable-stayed bridge, since the deck segment installed in the main span is dominant in compression force (a kind of axial force), it is necessary to design a cross section of the end segment corresponding to the dominant compression force, and moreover in the end segment that is vulnerable to the compression force. Although the local buckling prevention material of the present invention had to be installed, in the short span cable-stayed bridge of the present invention, since the tensile force to cancel the compressive force is generated in the end segment during the construction process, the compressive force generated is reduced in size to optimize the cross-section of the end segment (end segment). To reduce the amount of steel used in the upper and lower flanges of both sidewalls, and to reduce the manufacturing cost and construction cost of the end segment manufactured from steel, as well as to significantly reduce the amount of local anti-fogging material to be installed in the end segment. Very economical This construction is made possible between the cable-stayed bridge.

Second, after the construction of the short span cable-stayed bridge, additional compressive force is generated in the cable-stayed bridge due to live loads such as traffic load and wind load. This additional compressive force is also reflected in the cross-sectional design of the end segment, which eventually increases the weight of the deck segment. However, in the case of the present invention, the additional compressive force may be offset by the tensile force according to the present invention to control not only the compressive force generated in the construction process but also the compressive force due to the live load generated in the post-construction process. Construction is possible.

Third, the short span cable-stayed bridge according to the present invention can reduce the end segment production cost and construction cost if it is the same span standard by optimizing the sectional design of the end segment, so that the construction of the cable-stayed bridge can be more economical. The construction of the long span cable-stayed bridge will be possible.

Figure 1a is a force diagram showing the front view of the cable-stayed bridge according to the prior art and the form of the acting compression force,
Figure 1b is a graph showing the relationship between the length (L) of the major span in the cable-stayed bridge and the maximum compressive force generated in the deck segment between the main span,
1c is a force component diagram of a conventional short span cable-stayed bridge,
1D and 1E are construction drawings of a conventional improved short span cable-stayed bridge,
1f is a load action diagram of a conventional improved short span cable-stayed bridge,
2 is a construction of the short span tensile cable-stayed bridge of the present invention,
3a, 3b, 3c and 3d is a construction sequence diagram of the short-span tensile cable-stayed bridge according to the present invention and the resulting axial force diagram,
4a and 4b is a construction of the main column head tofu of the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in the specification and claims should not be construed as having a conventional or dictionary meaning, and the inventors should properly explain the concept of terms in order to best explain their own invention. Based on the principle that can be defined, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention. Therefore, the embodiments described in the present specification and the configurations shown in the drawings are merely examples of the present invention and are not intended to represent all of the technical ideas of the present invention, so that various equivalents And variations are possible.

Figure 2 shows the axial force diagram and the cross-sectional view of the end segment of the short span tensile cable-stayed bridge according to the present invention.

First, the cable-stayed bridge 100 according to the present invention is installed with the main towers 110 spaced apart from each other in the axial direction (longitudinal direction), as in the conventional short span cable-stayed bridge, and the separation distance between the main towers is the main span.

Deck segments 120 are installed between the main spans. The deck segments are fixed to one end of the inclined cable 300 to the anchorage blocks 130 installed to the outside of the main tower, and the other ends of the decks are passed through the top of the main tower 110. Installed to connect to the segment 120 is the same as the conventional short span cable-stayed bridge.

At this time, the deck segment 120 installed at the lower part of the main tower 110 is connected to the main section (C) of the main span continuously while supporting the segments with the inclined cable 300 from each main tower, which is the FCM (Free Cantilever Method) method. By the same conventional construction method it will be possible to install continuously connected to each other.

Accordingly, the compressive force accumulates in the deck segment 120 until the deck segments are rigidly connected to each other by the key segments in the central span C by the inclined cable 300.

However, in the process of gradually restoring the jack installed between the pylon and the initial deck segment to its pre-operation state as shown in FIG. 3d (step 4), the pylon, which is opened in the opposite direction to the center of the main span, moves toward the center of the main span, while the tension (T) is connected to the connected deck segment. This is introduced.

This tensile force (T) is approximately 20% of the absolute value is reduced compared to the compressive force acting on the conventional short-span cable-stayed bridge under the same conditions as well as to optimize the cross section of the deck segment, the buckling and Twisting occurs, and local buckling resistant materials that resist this buckling and twisting must be installed inside the deck segment.

However, the present invention can reduce the thickness of the upper and lower flanges, both side wall portion constituting the deck segment as shown in Figure 2 by reducing the compressive force, can significantly reduce the amount of local buckling prevention material (D) In particular, it is possible to construct a very economical cable-stayed bridge when constructing a simple cable-stayed bridge between long spans.

Therefore, the construction process of the present invention will be described based on FIGS. 3A, 3B, 3C, and 3D to construct the short-span tensile cable-stayed bridge of the present invention.

[Step 1]

First, both main towers 110 are installed as shown in FIGS. 3A and 3C. The main towers 110 are formed in a shape (for example, diamond type) that is laterally expanded to both side wall portions 111 while descending from the top to the bottom as a whole. And, the lower portion of both side wall portion 111 is installed to be supported on the base 140.

Both main tower 110 and the base 140 are both installed as a reinforced concrete structure.

The main tower (110, LEG) is installed spaced apart from each other in the axial direction and it can be seen that the interval between the main tower is the main span.

Between the side wall portions 111 of the main tower 110, the first deck segment 121 is installed to penetrate in the axial direction. The first deck segment 121 supports the cross beam 150 to be supported by the bridge support 160. Will be installed.

That is, the horizontal beam 150 is installed in the horizontal direction (orthogonal direction) between both sidewall portions 111 of the main tower 110 spaced apart from each other in the transverse direction so that both ends of the first deck segment 121 are bridged 160. ) And the girder of the upper plate 170 for the road to the cross beam 150 is also supported by the bridge support 160.

The area where the cross beam 150 is installed will be referred to as a point or head.

At this time, the support column 180 is installed on both sides of the main column 110 of the portion through which the first deck segment 120 penetrates.

The support 180 is installed to be detachable as a kind of strut (Strut) made of a steel frame.

The struts are made to have a U-shaped cross section so that the jack 200 to be described later can be seated therein.

Accordingly, when the support 180 is installed, the support 180 is in contact with the end surface of the reaction force 190 formed on both outer surfaces of the adjacent first deck segment 121.

The reaction table 190 may also be manufactured as a steel frame (or steel box) and may be installed only on the first deck segment 121 installed on the main head.

Thus, the first deck segment 121 having the reaction table 190 installed on both outer surfaces thereof has one end fixed to the anchorage block 130 and the other end connected to the first deck segment 121 via the top of the main tower 110. It can be seen that the inclined cable 300 is finally suspended to be installed.

In this state, a compressive force is generated as the axial force in the first deck segment 121 by the inclined cable 300, and this compressive force is supported by the main tower 110 via the support 180 through the reaction force 190. .

[Step 2]

Next, as shown in FIG. 3b, the additional deck segments 121 and 123 are continuously connected to the central section C by using the additional inclined cable 300 to the first deck segment 121 installed in the main head. Until this time, the compressive force is continuously generated in the initial deck segment 121 and other additional deck segments 122 and 123 and transmitted to the main column 110.

Of course, the additional deck segments (122,123) other than the initial deck segment is divided into two, but the number of installation may increase according to the extension length of the main span, and the main segments because the deck segments (121, 122, 123) are made to have the same extension length Two or more of the plurality may be installed with each other according to the extension length of.

In the present invention, except for the first deck segment 121, the end segments 122 and 123 which are continuously installed in the center portion of the main span will be referred to as additional end segments.

[Step 3]

Next, when the additional deck segments 123 are adjacent to each other in the main span center portion C as shown in FIG. 3C, the additional deck segments 123 are firmly connected to each other. For this purpose, a key segment 400 (KEY SEG) is used.

The key segment 400 is formed in the same cross-sectional shape as the deck segment and is for connecting additional deck segments 123 adjacent to each other.

The key segment 400 is set to be separately lifted by a lifting device not shown in the lower portion of the main span of the cable-stayed bridge to be inserted between adjacent additional deck segments 123.

Thus, the key segment 400 and the additional deck segments 123 adjacent to each other are firmly connected to each other.

Here, the meaning of hardening means that the first and additional deck segments are connected to each other structurally in succession, and the connection of the deck segments made of steel includes both the welding and the pressing by the tension material.

However, since the key segment 400 and the additional deck segment 123 adjacent to each other are not easily connected to each other while being in exact contact with each other on the same line, the spacing is adjusted through a set back operation.

To this end, the jack 200 is installed.

That is, after fixing both ends of the Sangik jack 200 to be detachable between the support 180 and the reaction force 190, the jack 200 is operated to set back.

That is, the set back operation does not increase the extension length of the jack 200, but operates in the direction of reducing the extension length so that the additional additional deck segment 123 is spaced slightly further apart to temporarily open the additional deck. The key segment 400 is easily inserted between the segments. If the key segment 400 can be secured to a sufficient distance to install the key segment, the setback may not be performed.

Accordingly, after the position of the key segment 400 is accurately set by the SET BACK operation, the key segment 400 and the additional deck segment 123 are set through the SET FOWARD operation of the jack 200. In the state in which they are in contact with each other in the same line, as shown above, the rigid segments are connected to each other so that the segment segments are continuously connected.

The support 180 is separated from the main tower 110 and the reaction table 190 as shown in FIG. 3D by the set forward operation.

The SET FOWARD operation means to compress the deck segment 123 adjacent to the key segment 400 while returning to the original space that the separation interval of the additional segments is opened by the SET BACK operation.

As a result, it can be seen that the deck segments 120 extending from the main heads of both main towers 110 to the main span center portion are structurally rigid and connected to each other.

Until this third step, the compressive force P is continuously generated in the deck segment 120 and transmitted to the main tower 110 through the jack 200 through the reaction force 190 of the end segment 120, and finally the compressive force. It can be seen that the main column 110 to resist.

[Step 4]

Accordingly, the jack 200 installed after the third step is removed as shown in FIG. 3D. The removal of the jack 200 proceeds approximately 1-5CM per hour, while gradually securing the stability of the deck segments (SET FOWARD). The original jack is restored.

That is, the present invention allows the main tower directly resists the accumulated compressive force acting on the deck segment 120 through the jack 200 installed between the reaction force 190 of the deck segment 120 and the main tower 110. (C) Let the pylons open in the opposite direction,

By gradually restoring the jack 200, the main column 110, which is opened, moves toward the center portion of the main span again, so that the tensile force T is introduced into the deck segment 120 through the jack 200 so that the compression force is offset. .

In this case, based on FIG. 3D, it can be seen that the main tower 110 moves by a displacement against L1 toward the center portion C of the main span in the open state.

As a result, the final jack 200 is naturally separated as the gap between the main tower 110 and the reaction table 190 of the end segment 120 is sufficiently widened.

In this process, the main tower 110 and the reaction force of the deck segment 120 is stabilized while being spaced apart, so that the first deck segment is supported and installed on the bridge support 160 of the cross beam 150 installed in the head as described below. Done.

The number of installation of the deck segment 120 installed in the main span is the magnitude of the tensile force (T) to be installed in the fourth segment to be suspended by the inclined cable 300 and the rigidly connected deck segment 120 to cancel the compressive force, It can be adjusted by various factors such as the installation angle of the inclined cable 300, but based on the case of setting the size of the compressive force to be offset by approximately 20%, the deck segment 120 can be optimized and very economical Construction of the cable-stayed bridge was realized.

As such, the present invention is a compression force is generated in the deck segment at the beginning of the deck segment installation, but in the process of restoring the jack installed in the center of the main span between the deck segments and restoring the installed jack, so that the compressive force to the deck segment is generated Compared to the deck segment that is designed to be cross-sectional design dominated by the maximum compressive force in the prior art, it is possible to manufacture a more economical cross-section deck segment is particularly advantageous for long span cable-stayed bridge between long spans.

In addition, after the construction of the cable-stayed bridge, the vehicle passes, and additional compressive force is generated in the rigidly connected deck segment 120 of the cable-stayed bridge due to wind load.

This additional compressive force is considered in the deck segment cross-sectional design is reflected in the deck segment cross-sectional size, the present invention can control this additional compressive force by the restraint tensile force it is possible to design and construct a very efficient cable-stayed bridge.

Figure 4a can be confirmed in particular the installation of the deck segment in the main head of the pylon, the first deck segment 121 connected to each other by the inclined cable to be seated by the bridge support 160 of the cross beam 150 installed in the main head. It can be seen that, the girder installed on the upper plate 170 of the access road is also seated by the bridge support 160 of the cross beam 150 so that the first deck segment 120 and the girder of the access road is stretched each other It can be seen that (B) is connected to each other.

Thus, the deck segment 120 of the present invention is able to maintain a safe setting state is seated on the cross beam 150 as the jack 200 is removed.

Therefore, when considering wind pressure in the construction process, the main tower can be moved in the longitudinal direction, and even after the bridge is completed, movement by the temperature in the longitudinal direction can be somewhat unstable.

Thus, the present invention, as shown in Figure 4a, the damper 510 is installed on the upper surface of the main beam main head 150, the damper 510 is the support frame 520 installed on the lower surface of the horizontal beam 150 and the deck segment 120 The damper 510 may be connected to the deck segment 120 to control the movement of the deck segment 120 in the axial direction.

This damper is to always absorb the effects of temperature load, wind load, passing vehicle, and to ensure the stability of the entire bridge by resisting the instantaneous shock generated during the earthquake.

In addition, the main column head outer surface is provided with a support 530 in the form of a bracket, the lower end of the link member 540 is connected to the support 530, the upper end of the link shoe (120) on the outer surface of the deck segment (120) Link segment 540 is connected to the 550, the deck segment 120 and the main tower 110 in the vertical direction connected to the deck segment 120 generated from the head by the link shoe 550 of the upper end of the link member 540 To control the negative reaction force.

In addition, the link member 540 is rotatable in the axial direction so that the longitudinal displacement of the deck segment 120 is also controlled.

Furthermore, as shown in FIG. 4B, the wind shoe 560 may be installed at both side surfaces of the deck segment and the transverse inner surface of the main column in order to control the movement of the deck segment by the wind.

In addition, the anchorage block 130 is constructed in the form of a concrete block at a position spaced apart from the outside of the main tower so that one end of the inclined cable 300 is fixed, and is constructed in a structure in which the internal hollow is formed so that the inclined cable is fixed and fixed.

The inclined cable 300 has one end fixed to the anchorage block 130, it can be seen that a large number is connected to the deck segment via the top of the main tower.

100: short span cable stayed bridge
110: pylon 111: both side walls (main tower)
120: deck segment 121: first deck segment
122.123: Additional Deck Segment 130: Anchorage Block
140: base 150: crossbeam
160: bridge support 170: access road deck
180: support (strut) 190: reaction force
200: Jack 300: inclined cable
400: KEY SEG 510: damper
520: support frame 530: support
540: link member 550: link shoe
560 windshoe
B: Expansion joint C: Center of main span
D: Local buckling prevention material

Claims (10)

A first step of installing the first deck segment 121 using the inclined cable 300 to be directly supported by both main towers 110 spaced apart from each other in the axial direction;
A second step of installing a plurality of deck segments in the initial deck segment 121 by using a plurality of additional inclined cables 300 in a row in the center of the main span C;
When the deck segments to be connected to each other in the main span center portion (C) are adjacent to each other, the jack 200 is installed between the main tower and the first deck segment, and then the key segments 400 are disposed between the deck segments to be connected to each other, and the jack 200 is provided. A third step of continually connecting the deck segments to be connected to each other by connecting the deck segments to be connected to each other, thereby continuing the deck segments; And
Tensile force (T) to the deck segment connected to the main tower 110 and the first deck segment 121 is gradually restored to the pre-operation state by moving the main tower 110 opened in the opposite direction to the center of the main span while moving toward the center of the main span. 4) step to be introduced; Short-span tensile type cable-stayed bridge construction method comprising a. According to claim 1, wherein the main tower 110 and the first end segment 121 is in direct contact with each other by the support 180 is installed to be detachable to the main tower 180 and the reaction table 190 installed on the first end segment 121. And, the support 180 is a short-span tension cable-stayed bridge construction characterized in that to be separated from the main tower 110 and the reaction table 190 of the first end segment in the process of gradually restoring the jack 200 to the pre-operation state Way. The method of claim 2, wherein the support 180 is made of a U-shaped steel frame is installed on the inner side surface of both side walls and the short-span tensile type characterized in that the jack 200 can be seated and installed inside the support. Construction method of cable-stayed bridge. The method according to claim 1, wherein the two main towers 110 are formed as both sidewalls 111 extending laterally from each other from the top to the bottom, and the bottom of both sidewalls are supported and installed by a base. Short span tension cable-stayed bridge construction method characterized in that the end segments continuously connected to each other penetrate between the side wall portions in the axial direction. According to claim 2, Between the side wall portion is further provided with a cross beam 150, the bridge support 160 is installed on the upper surface of the cross beam to support the end of the end segment continuous to the bridge support, the cross beam ( 150, the bridge support is further installed to support the girder of the access road top plate, and the girder of the access road top plate supported by the bridge support and the continuous end segment are connected to each other by the expansion joint (B). Short span tensile cable-stayed bridge construction method characterized in that. The damper 510 is installed on the upper surface of the cross beam 150, and the damper 510 is connected to the support frame 520 installed on the bottom of the deck segment continuous with the cross beam 150. Short span tension cable-stayed bridge construction method characterized in that the 510 can control the movement of the deck segment 120 in the axial direction. According to claim 6, wherein the main tower outer surface is provided with a support 530 in the form of a bracket, the lower end of the link member 540 connected to the support 530, the upper end on the outer surface of the continuous deck segment Link shoe 550 to control the axial direction (longitudinal) movement of the upper end of the link member 540 by connecting to the link shoe 550, the link member 540 is connected to the deck segment and the main tower 110 continuous in the vertical direction. Short span tension cable-stayed bridge construction method characterized in that to control the side reaction force of the continuous deck segment (120) by. The method of claim 6, wherein the windshield is installed on both outer surfaces of the continuous deck segment and the transverse inner surface of the main column to control the movement of the deck segment by wind power. . The short-span tension cable-stayed bridge of claim 1, wherein the continuous deck segment is made of a hollow box made of steel, and the reaction force 190 is made of a steel frame. Construction method. 10. The method of claim 9, wherein the key segment is structurally rigid and connected to the deck segment by using a hollow box made of steel.

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