WO2006065041A1

WO2006065041A1 - Temporary bridge of a cable-stayed girder bridge type with a long span

Info

Publication number: WO2006065041A1
Application number: PCT/KR2005/004238
Authority: WO
Inventors: Sung Kim
Original assignee: Leton Bridge Co., Ltd
Priority date: 2004-12-13
Filing date: 2005-12-13
Publication date: 2006-06-22
Also published as: KR20050002746A; KR100512663B1

Abstract

Provided is a cable-stayed girder bridge type long-span temporary bridge, which easily and safely realize a long span of a temporary bridge to which various loads are applied or of which a temperature is extremely changed by installing a stay cable at a position requiring tension.

Description

TEMPORARY BRIDGE OF A CABLE-STAYED GIRDER BRIDGE TYPE WITH A LONG SPAN

Technical Field

[1] The present invention relates to a temporary bridge, and more particularly, to a cable-stayed girder bridge type long-span temporary bridge, which easily and safely realize a long span of a temporary bridge to which various loads are applied or of which a temperature is extremely changed by installing a stay cable at a position requiring tension. Background Art

[2] A temporary bridge is installed and used for various purposes such as ensuring of a detour upon road repairing, detour crossing of vehicles upon bridge repairing, building of a pedestrian bridge on a busy road, or building of a work bridge in port facilities.

[3] Since a conventional temporary bridge uses an I-beam and a deck plate and has a short span and a complicated shape, a construction cost and a construction period excessively increase and thus construction performance significantly deteriorates. In addition, in the rainy season, a float material may be caught on a short-span temporary bridge so that the river overflows or the bridge may upset due to a lateral load having a high flow rate. Accordingly, there is a need for installing a long-span temporary bridge.

[4] A prestress type constructing method using a steel rod or a steel wire is mainly used for a method of constructing a long-span temporary bridge. The prestress type constructing method can construct a temporary bridge having a long span of about 30 to 35 m. However, this structure and constructing method is suitable for a temporary bridge to which a load is not changed, but not suitable for a temporary bridge to which various loads are applied or of which a temperature is extremely changed. It is difficult to realize a long span of a temporary bridge by a limit of prestress applied to an I-beam due to the tension of the steel rod and of because moment reduction due to prestressing does not significantly influence total moment (positive and negative moment).

[5] In order to solve this problem, Korean Utility Model No. 20-0278091 (entitled

"Repair reinforcing apparatus in a damaged bridge using an external stay cable") discloses a technology of reinforcing the repair of a damaged bridge using an external stay cable.

[6] However, the technology disclosed in Korean Utility Model No. 20-0278091 cannot structurally apply to the above-mentioned long-span temporary bridge.

[7] Accordingly, the present applicant suggested a long-span temporary bridge using a stay cable, comprising: a connection frame which is inserted between a bridge post and a main beam and of which the both ends are protruded from the bridge post, tower frames of which the lower ends are attached to the both ends of the connection frame and the upper ends are higher than the upper surface of the main beam, a plurality of girder support beams which is attached to be protruded from the both ends of the main beam across the lower side of the main beam, a plurality of fixing frames which is attached in correspondence with the both lower ends of the girder support beams, and a stay cable which is connected to the upper ends of the tower frames and is integrally connected to the upper end of adjacent tower frame across the plurality of fixing frames (See Korean Patent application No. 2004-75515).

[8] Recently, as the temporary bridge is used for various purposes such as a detour bridge, a construction bridge, or a permanent bridge, the length and the width of the temporary bridge become longer and the use period of the temporary bridge becomes longer. Accordingly, a method of constructing an economical temporary bridge, which can address the problems of the conventional long-span temporary bridge and ensure the longer span and excellent constructing performance, is increasingly required. Disclosure of Invention Technical Problem

[9] The present invention is contrived to solve the above-mentioned problems, and an object of the present invention is to provide a cable-stayed girder bridge type long-span temporary bridge, which easily and safely realize a long span of a temporary bridge to which various loads are applied or of which a temperature is extremely changed by installing a stay cable at a position requiring tension.

[10] Another object of the present invention is to provide a cable- stayed girder bridge type long-span temporary bridge having a more stable structure by installing a cross beam at a weakest point of the bridge when forming a long-span temporary bridge. Technical Solution

[11] According to an aspect of the present invention, there is provided a cable-stayed girder bridge type long-span temporary bridge having a bridge post, a main beam installed on the bridge post, and a plurality of deck plates installed on the main beam, including connection frames which are installed at the both upper sides of the bridge post to be inserted between the bridge post and the main beam; tower frames which are attached such that the lower ends thereof correspond to the lower side of the connection frames and the upper ends thereof are higher than the upper surface of the main beam; a plurality of cable fixing members which is positioned on structurally predetermined positions and attached to the both sides of the main beam; a plurality of stay cables which connects the upper ends of the tower frames with the plurality of cable fixing members; at least one cross beam which is positioned at a structurally predetermined position and attached to the lower end of the main beam; and a tension means which is installed on the lower end of the cross beam and stains the cross beam in a length direction.

[12] In addition, there is provided a cable-stayed girder bridge type long-span temporary bridge having a more stable structure by installing an assembly type fixed-member support device and an assembly type moving-member support device on the connection frame such that the temporary bridge can expand or contract depending on season change, that is, temperature change when installing a long-span temporary bridge.

Advantageous Effects

[13] According to the present invention, it is possible to provide a cable-stayed girder bridge type long-span temporary bridge, which easily and safely realize a long span of a temporary bridge to which various loads are applied or of which a temperature is extremely changed by installing a stay cable at a position requiring tension. [14] In addition, it is possible to provide a cable-stayed girder bridge type long-span temporary bridge having a more stable structure by installing a cross beam at a weakest point when installing a long-span temporary bridge. [15] Furthermore, by installing an assembly type support device, the temporary bridge can expand and contact in its length direction depending on temperature change, impact due to an upper load is relaxed, and restriction for rotation is reduced, thereby realizing stability of a long-span bridge. [16] Moreover, when a temporary bridge is installed at a position where many float materials due to a heavy rain pass or a flow rate is high, the overflow of the river due to the float material can be minimized by constructing the temporary bridge having one bridge post.

Brief Description of the Drawings [17] The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings in which: [18] FIG. 1 is a front view of a cable-stayed girder bridge type long-span temporary bridge according to an embodiment of the present invention; [19] FIG. 2 is a plan view of FIG. 1 ;

[20] FIG. 3 is a lateral cross-sectional view of FIG. 1;

[21] FIG. 4 is a lateral cross-sectional view of a temporary bridge in which the upper end of a bridge post corresponds to the lower end of a tower frame according to another embodiment of the present invention; [22] FIG. 5 is a lateral cross-sectional view of a door-shaped temporary bridge in which a frame is connected between the upper sides of the tower frames in a horizontal direction according to another embodiment of the present invention; [23] FIGS. 6 and 7 illustrate examples of changing the height of the tower frame in order to adjust tension due to a stay cable; [24] FIG. 8 is a lateral cross-sectional view of a case where prestress is applied to a cross beam using a tension material; [25] FIG. 9 is a lateral cross-sectional view of another case where prestress is applied to a cross beam using a tension material; [26] FIG. 10 is a bottom view of FIG. 9;

[27] FIG. 11 is a partial plan view illustrating a connection between a connection slab and a main beam;

[28] FIG. 12 is a lateral cross-sectional view of FIG. 11;

[29] FIG. 13 is a plan view of an assembly type fixed- member support device;

[30] FIG. 14 is a cross-sectional view taken along line B-B of FIG. 13;

[31] FIG. 15 is a cross-sectional view taken along line A-A of FIG. 13;

[32] FIG. 16 is a plan view of an assembly type moving-member support device;

[33] FIG. 17 is a cross-sectional view taken along line B-B of FIG. 16;

[34] FIG. 18 is a cross-sectional view taken along line A-A of FIG. 16; and

[35] FIG. 19 is a front view of a cable-stayed girder bridge type long-span temporary bridge using one bridge post. [36] <Reference Numerals>

[37] 1: Bridge post 2: Tower frame

[38] 3: Main frame 4: Deck plate

[39] 5: Cross beam 6: Cable fixing member

[40] 7: stay cable 8: Connection frame

[41] 9: Connection slab 10: Saddle

[42] 11: Tension member 12: buffer material

[43] 13 : Frame 31 : Upper plate

[44] 32: Lower plate 33: Polytron disc

[45] 34: Guide bar 35: Front end pin

[46] 36: Slip plate 37: Lubricating slide plate

[47] 38: High-tension bolt

Best Mode for Carrying Out the Invention [48] Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the attached drawings such that the present invention can be easily put into practice by those skilled in the art. [49] FIG. 1 is a front view of a cable-stayed girder bridge type long-span temporary bridge according to an embodiment of the present invention, FIG. 2 is a plan view of 1, and FIG. 3 is a lateral cross-sectional view of FIG. 1.

[50] Referring to FIGS. 1 through 3, the cable-stayed girder bridge type long-span temporary bridge according to the present embodiment includes bridge posts 1, tower frames 2, main beams 3, deck plates 4, cross beams 5, cable fixing members 6, stay cables 7, connection frames 8, and connection slabs 9.

[51] Each bridge post 1 is a steel material in which a plurality of H-beams is installed, and is installed on the surface of land. The main beams 3 are installed on the bridge posts 1. In addition, a plurality of deck plates 4 made of a steel material is installed on the main beams 3.

[52] The connection frames 8 are attached to the upper both sides of each bridge post 1 to be protruded from the main beams 3. The lower surface of the tower frame 2 is attached to the upper surface of each connection frame 8. A plurality of stay cables 7 are connected to one side of the upper surface of each tower frame 2 such that the tower frame 2 functions as a central pillar for supporting tension due to the plurality of stay cables 7.

[53] The cable fixing members 5 are the both sides of the main beam 3. Similar to the connection frames 8, the cable fixing members 5 are protruded from the main beams 3 such that the stay cable 7 is parallel to the length direction of the main beam 3. The cable fixing members 5 are attached to the side surfaces of the main beams 3 at a structurally predetermined position. The position and the number of the cable fixing members 5 are determined by structural calculation considering the length of the temporary bridge and the characteristics of topography.

[54] The plurality of stay cables 7 are connected between the upper surface of the tower frame 2 and the ends of the plurality of cable fixing members 5 such the cable fixing members 5 apply tension to the both sides of the main beams 3, thereby removing sagging phenomenon of the temporary bridge due to the long span. As mentioned above, the stay cables 7 apply tension to structurally predetermined points such that the sagging phenomenon of the temporary bridge can be efficiently removed.

[55] At least one cross beam 5 is attached at a predetermined position of the lower surface of the main beams 3. The cross beams 5 are installed on predetermined positions in consideration of compensation of sagging stress of the temporary bridge due to the tension of the stay cable 7. In other words, the cross beams 5 are installed at positions obtained by calculating weakest portions when applying the tension using the stay cable 7. The positions of the stay cables 7 and the positions of the cross beams 5 can be determined depending on the circumferential or topographical characteristics to improve structural calculation and construction performance. [56] The both ends of the main beams 3 are seated on the L-shaped connection slabs 9, and thus the temporary bridge is evenly connected to the road of land and becomes more stable. The stay cables 7 are connected between the upper surfaces of the connection slabs 9 and the upper end of the tower frame 2 to reduce negative (-) moment generated by the bridge posts, thereby constructing a longer-span temporary bridge.

[57] When the temporary bridge includes two bridge posts 1, it is preferable that the position of each bridge post 1 and the fixing position of the stay cable are structurally symmetrical to each other.

[58] FIG. 4 is a lateral cross-sectional view of a temporary bride in which the upper end of a bridge post 1 corresponds to the lower end of a tower frame 2 according to another embodiment of the present invention.

[59] In FIG. 4, the edges of the bridge post 1 extend in a horizontal direction such that the connection frames 8 are attached to the main beams 3 on the extensions. Accordingly, when attaching the tower frame 2 on the connection frame 8, the connection frame 8 can endure a larger force.

[60] FIG. 5 is a lateral cross-sectional view of a door-shaped temporary bridge in which a frame 13 is connected between the upper sides of the tower frame 2 in a horizontal direction according to another embodiment.

[61] In FIG. 5, by connecting the tower frames 2 to each other using the frame 13, the tower frames 2 have more stable fixing structure.

[62] FIGS. 6 and 7 illustrate examples of changing the height of the tower frame 2 in order to adjust the tension due to the stay cable.

[63] FIG. 6 illustrates a one-step tower frame 2 and FIG. 7 illustrates a two-step tower frame 2. When stronger tension need be structurally applied (for example, when a span is longer, when the width of the main beam is larger, or when traffic is heavy), by increasing the height of the tower frame 2, the tension applied to the main beam 3 by the stay cable 7 increases and thus the sagging phenomenon is prevented.

[64] FIG. 8 is a lateral cross-sectional view of a case where prestress is applied to the cross beam 5 using a tension material 11.

[65] In FIGS. 1 through 3, sine the tension due to the stay cable 7 is applied to only the both sides of the temporary bridge, that is, the both sides of the main beams 3, the sagging phenomenon may be slightly generated at the center of the temporary bridge.

[66] Accordingly, in order to remove the sagging phenomenon generated at the center of the temporary bridge, two fixing frames 15 are attached to the lower end of the cross beam 5, and the tension material 11 is connected between the fixing frames 15 such the both ends thereof are mounted and strained at the fixing frames. Here, the tension material 11 may be made of a steel rod, steel wire, or a cable. [67] In other words, by applying the prestress to the tension material 11, the cross beam

5 rises and the stress of the cross beam 5 is adjusted, thereby significantly improving the sagging phenomenon.

[68] FIG. 9 is a lateral cross-sectional view of another case where prestress is applied to the cross beam 5 using the tension material 11, and FIG. 10 is a bottom view of FIG. 9.

[69] Referring to FIGS. 9 and 10, a saddle 10 is attached to the central lower end of the cross beam 5 and two tension materials 11 are attached to the both ends of the cross beam 5 across the saddle 10. Two guide grooves (not shown) for fixing and guiding the two tension materials 11 are formed in the saddle 10 in the length direction of the cross beam.

[70] FIG. 11 is a partial plan view of a connection between the connection slab 9 and the main beam 3 and FIG. 12 is a lateral cross-sectional view of FIG. 10.

[71] Referring to FIGS. 11 and 12, the vertical sections of the temporary bridge are seated on the L-shaped connection slabs 9. In particular, grooves 25 are formed at portions of the connection slab 9 contacting the main beams 3, and buffer materials 12 for buffering a vertical force applied to the main beams 3 are filled in the grooves 25. In addition, the buffer materials 12 are attached to the side surfaces of the connection slab 9 such that a horizontal force applied to the main beam 3 can be buffered.

[72] Here, the buffer materials 12 may be made of a group of products having chemical characteristics such as rubber, synthetic resin, a recycled product, styrofoam, or sponge or various buffer materials such as wood or steel material.

[73] FIG. 13 is a plan view of an assembly type fixed-member support device, FIG. 14 is a cross-sectional view taken along line B-B of FIG. 13, and FIG. 15 is a cross-sectional view taken along line A-A of FIG. 13.

[74] The assembly type fixed-member support device is formed by installing a front end pin 35, a polytron disc 33 which is a circular urethane material, and an upper plate 31 on a lower plate 32 and assembling a guide bar 34 at the side surface of the support device. Although not shown in FIGS. 3 through 5, the lower plate 32 and a connection frame 8 which is a lower structure are coupled to each other by a high-tension bolt 38 and the upper end of the assembly type fixed-member support device is attached to the lower side of the main beam 3.

[75] FIG. 16 is a plan view of an assembly type moving-member support device, FIG. 17 is a cross-sectional view taken along line B-B of FIG. 16, and FIG. 18 is a cross- sectional view taken along line A-A.

[76] A slip plate 36 made of stainless material and a lubricating slide plate 37 made of fluoric resin are installed on the upper plate 31 of the fixed-member support device to absorb expansion and contraction due to temperature change and to remove a binding force. In addition, by installing the polytron disc 33, impact due to an upper load is relaxed and restriction for rotation is reduced.

[77] FIG. 19 is a front view of a cable-stayed girder bridge type long-span temporary bridge using one bridge post 1. When the stay cables 7 are connected to the cable fixing members 6 attached to the both sides of the main beam 3 instead of the cross beam 5, the cross beam 5 need not be installed at the center of the temporary bridge, and thus the temporary bridge may have one bridge post. Accordingly, when the length of the temporary bridge is short or a temporary bridge is installed at a position where many float materials due to a heavy rain pass or a flow rate is high, the overflow of the river due to the float material can be minimized by constructing the temporary bridge having one bridge post 1.

[78] Although the exemplary embodiments and the modified examples of the present invention have been described, the present invention is not limited to the embodiments and examples, but may be modified in various forms without departing from the scope of the appended claims, the detailed description, and the accompanying drawings of the present invention. Therefore, it is natural that such modifications belong to the scope of the present invention. Industrial Applicability

[79] The present invention can apply to a bridge or various temporary systems. In particular, it is possible to provide an economical stable temporary system.

Claims

[1] A cable-stayed girder bridge type long-span temporary bridge having a bridge post, a main beam installed on the bridge post, and a plurality of deck plates installed on the main beam, comprising: connection frames which are installed at the both upper sides of the bridge post to be inserted between the bridge post and the main beam; tower frames which are attached such that the lower ends thereof correspond to the lower side of the connection frames and the upper ends thereof are higher than the upper surface of the main beam; a plurality of cable fixing members which is positioned on structurally predetermined positions and attached to the both sides of the main beam; a plurality of stay cables which connects the upper ends of the tower frames with the plurality of cable fixing members; at least one cross beam which is positioned at a structurally predetermined position and attached to the lower end of the main beam; and a tension means which is installed on the lower end of the cross beam and stains the cross beam in a length direction.

[2] The cable-stayed girder bridge type long-span temporary bridge according to claim 1, wherein the both ends of the connection frames are protruded from the bridge post.

[3] The cable-stayed girder bridge type long-span temporary bridge according to claim 1, wherein the width of the bridge post is larger than that of the main beam, and the connection frames are positioned on the both upper sides of the bridge post protruded from the main beam such that the bridge post corresponds to the lower end of the tower frame.

[4] The cable-stayed girder bridge type long-span temporary bridge according to claim 2 or 3, further comprising a connection frame for connecting the tower frames in a horizontal direction.

[5] The cable-stayed girder bridge type long-span temporary bridge according to claim 1, which the both ends of the cable fixing members are protruded to correspond to the connection frame.

[6] The cable-stayed girder bridge type long-span temporary bridge according to claim 1, wherein the tension means comprises at least two fixing frames installed on the lower end of the cross beam, and a tension material of which the both ends are mounted and strained at the fixing frames.

[7] The cable-stayed girder bridge type long-span temporary bridge according to claim 1, wherein the tension means comprises a saddle which is installed on the central lower end of the cross beam and in which guide grooves are formed, and a tension material of which the both ends are mounted at the both ends of the cross beam.

[8] The cable-stayed girder bridge type long-span temporary bridge according to claim 1, wherein the both ends of the main beam are seated on connection slabs.

[9] The cable-stayed girder bridge type long-span temporary bridge according to claim 8, wherein the connection slab comprises a slab body in which grooves are formed at portions for seating the both ends of the main beam, and a buffer material filled in the grooves.

[10] The cable-stayed girder bridge type long-span temporary bridge according to claim 9, wherein the buffer material includes at least one of rubber, synthetic resin, a recycled product, styrofoam, sponge, wood material, or a steel material.

[11] The cable-stayed girder bridge type long-span temporary bridge according to claim 1, further comprising an assembly type fixed- member support device including a lower plate attached to the upper side of each connection frame, a disc member positioned on the lower plate, an upper plate positioned on the disc member, a fastening member for fastening the upper plate and the lower plate, and guide bars mounted at the side surfaces of the lower plate and the upper plate.

[12] The cable-stayed girder bridge type long-span temporary bridge according to claim 11, further comprising an assembly type moving-member support device including a slip plate positioned on the upper plate of the assembly type fixed- member support device and a slide plate positioned on the slip plate.