KR102000114B1 - Modular truss girder for temporary bridge and installation structure thereof - Google Patents

Abstract

The present invention relates to a modular truss girder for a temporary bridge and an installation structure thereof. The girder is a truss girder for a suspended bridge having a box-shaped body having a truss structure, wherein the girders are arranged in parallel in a longitudinal direction so that the girder body has a rectangular cross section; And a plurality of belt units provided in a circumferential direction at a unit position in the longitudinal direction of the frame. The present invention is characterized in that one module is constituted, and the installation and disassembly of the girders are easy and the post- And the longitudinal and lateral expansion of the hypothetical bridge or the mold can be facilitated without hindering the structural strength.

Description

TECHNICAL FIELD [0001] The present invention relates to a modular truss girder for a hybrid bridge,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a girder used in constructing a temporary bridge, and more particularly to a truss type girder and its installation structure.

Generally, a temporary bridge is a temporary construction for the purpose of securing the transportation route of the equipment for the quick restoration work in the case of the bridge or the road breakage and the passage of the vehicle or the pedestrian. The temporary bridges include a pit and / or an alternately formed vent, and a mold and a laminating plate, which are sequentially mounted on the upper part. The mold of the conventional temporary bridges includes a plurality of I- Is used to connect with the general.

Such a conventional I-shaped steel girder bridge type mold is complicated because it involves a relatively large number of fixing members such as a slant material. Particularly, in order to avoid the interference between the fixing member and the I-beam or the interference between the upper plate and the upper plate when the mold is extended, the connection operation to the upper surface of the adjacent I-shaped steel is mainly performed by directly welding in situ instead of a simple fastening member such as a bolt It is difficult to install and dismantle a temporary bridge, and since the welded portion is forcibly cut at the time of disassembly, there is a problem that the possibility of recycling the recovered parts is also remarkably low. Further, in the case of a conventional I-shaped steel girder bridge type, the length of the I-shaped steel, the web and flange specifications are limited, and the I-shaped steel connection structure using a fixing member such as a slanting material is inefficient.

Further, in the case of the conventional I-shaped steel girder bridge type, in order to prevent the weakening of the strength of the mold due to the increase of the moment at the point of the venting point during the long span construction, simply increase the cross section of the mold, However, the structural strength of the mold is insufficient and the strength of the girder and the weight of the girder increase and the construction becomes complicated.

An object of the present invention is to provide a truss girder for a temporary bridge which is easy to install and dismantle and which is excellent in recycling of recovered products and its installation structure. Another object of the present invention is to provide a truss girder for a temporary bridge and a mounting structure of the truss girder which can easily extend in the longitudinal direction and the transverse direction of the temporary bridge or the mold without hindering the structural strength.

The inventors of the present invention have studied and developed a truss girder for a temporary bridge, which is easy to install and dismantle, has excellent recyclability for recovered products, at the same time has improved structural strength and is easy to longitudinally and laterally expand A box type module having a belt unit in the circumferential direction at a longitudinal unit position of the truss mold is manufactured in advance, and then a process of removing and attaching between the lateral and longitudinal molds and a process of removing and attaching the mold and the vent are performed, In addition, it is possible to eliminate the interference caused by the fastening member in the connection between the transverse direction and the longitudinal direction, and to solve the tolerance and workability of the box type module when connecting the mold and the vent, The box-type modules related to the structural strength of the molds during the span construction are attached to the girders By further refine the details of the design it has been reached with the present invention. The gist of the present invention based on recognition and attention to the above-mentioned problem is as follows.

(1) A truss girder for a suspended bridge having a box-shaped body having a truss structure, the truss girder comprising: a group of frames arranged in parallel in the longitudinal direction so that the girder body has a rectangular cross section; And a plurality of belt units provided in a circumferential direction at a group of the frame longitudinal direction unit positions, constituting one module.

(2) The truss girder for a temporary bridge according to (1), wherein the frame is an 'a' section steel and the inside of the 'A' section steel is arranged to face the inside of the girder body.

(3) The truss girder for a temporary bridge according to (1), wherein each of the plurality of belt units is composed of a plurality of plate members coupled to adjacent frames, and each of the plurality of plate members has a plurality of fastening holes.

(4) The truss girder for a temporary bridge according to (1), wherein each of the plurality of belt units is provided to be spaced inward from an interface of the frame.

(5) The truss girder for a temporary bridge according to (1), wherein the transverse connection between the girders is a method of bolting the belt unit between transversely adjacent girders.

(6) The truss girder for a temporary bridge according to (5), further comprising a spacer interposed between the adjacent inter-girder belt units in the lateral directional connection between the girders.

(7) The truss girder for a temporary bridge according to (1), further comprising a joint plate bolted to each of the inter-girder belt units in the longitudinal direction when the girders are longitudinally connected.

(8) The truss girder for a temporary bridge according to (1), further comprising a synchro plate assembly coupled to the belt unit and the vent when the girder and the vent are connected.

(9) The diaphragm plate assembly is provided as a pair of upper and lower platelet plates, wherein the upper platemember plate is bolted to the belt unit and the lower platemember plate is welded to the upper surface of the vent, And the lower plate pair is bolted to the truss girder.

(10) The belt tensioner according to any one of (1) to (10) above, further comprising a momentum strengthening plate bolted to each other between the belt units arranged in the longitudinal direction of the girder, Truss girder for a temporary bridge.

(11) The truss girder for a temporary bridge according to (1), further comprising a plurality of vertical truss units provided on side surfaces of the girder body to support adjacent frames.

(12) The truss girder for a temporary bridge according to (1), further comprising a plurality of horizontal truss units provided inside the girder body to support a frame in a diagonal direction.

(13) The truss girder for a temporary bridge according to (12), wherein the horizontal truss unit is provided on the mutually facing side surfaces of the girder body and is joined to a horizontal flange supporting an adjacent frame.

(14) a plurality of vents provided upright on the ground at regular intervals; A plurality of molds mounted on top of the plurality of vents; And a ladder plate mounted on the upper portion of the casting mold, wherein each of the plurality of castings is a truss girder for a temporary bridge having a box-like body having a truss structure, wherein the girder body has a rectangular cross- A group of frames arranged in parallel; And a plurality of belt units provided in a circumferential direction at a unit length in the longitudinal direction of the frame, wherein the lateral connection between the girders is made by bolting the belt unit, The longitudinal connection between the girders is made through a joint plate bolted to each belt unit of the adjacent girder and the connection between the girder and the vent is made through the diaphragm plate assembly coupled to the belt unit and the upper surface of the vent , The structure of a hypothetical bridge installation.

(15) The installation structure of a hypothetical bridge according to (14), characterized by further comprising a spacer interposed between adjacent girder belt units when the girders are laterally connected.

(16) The belt tensioner according to any one of the preceding claims, further comprising a momentum-strengthening plate bolted to each other between the belt units arranged in the longitudinal direction of the girder, wherein the momentum-stiffening plate is provided on the upper surface of the installed girder, (14). ≪ / RTI >

(17) The calibration plate assembly is provided as a pair of upper and lower calibration plates, wherein the upper calibration plate is bolted to the belt unit and the lower calibration plates are welded to the upper surface of the vents, And the pair of lower plates are bolted to each other.

According to the modular truss girder for a temporary bridge of the present invention and its installation structure, a box-shaped module having a belt unit in the circumferential direction at a unit position in the longitudinal direction of the truss mold is manufactured in advance, And venting between the vents can be easily installed and disassembled and the recyclability of the recovered product can be greatly improved through a simple method of dismounting and attaching the vent assembly between the belt unit and the belt unit without welding.

Further, according to the present invention, it is possible to effectively eliminate the interference phenomenon and the interference phenomenon between the horizontal and vertical girders by interposing the belt unit inside the frame, It is possible to improve the workability and alleviate the connection tolerance when connecting the joints, and to minimize the influence of the moment at the connection point of the vent when the long span is constructed by the force moment reinforcing plate, thereby facilitating long span construction. In this case, it is advantageous in terms of reducing the installation cost of the vent at the time of long span construction of the girder, making it possible to reduce the construction cost and air shortening, and to secure a sufficient mold space.

1 is a plan view and a front view of a modular truss girder according to an embodiment of the present invention;
2 is a cross-sectional view of a modular truss girder according to an embodiment of the present invention.
3 is a schematic view of a lateral connection of a modular truss girder according to an embodiment of the present invention.
4 is a schematic view of a longitudinal connection of a modular truss girder according to an embodiment of the present invention;
5 is a schematic diagram illustrating a connection between a modular truss girder and a vent top member according to an embodiment of the present invention.
6 is a detailed view of a connection between a modular truss girder and a vent top member according to an embodiment of the present invention.
FIG. 7 is an installation view of a force moment reinforcing plate according to an embodiment of the present invention. FIG.
FIG. 8 is a view for improving the resistance of the parent moment according to the embodiment of the present invention before and after the installation of the momentum reinforcing plate. FIG.
9 is a schematic view showing an installation structure of a modular truss girder according to an embodiment of the present invention.
10 is a schematic view of a mounting state of a modular truss girder and a lumbar support plate according to an embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to examples. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately The present invention should be construed in accordance with the meaning and concept consistent with the technical idea of the present invention. Therefore, the configuration of the embodiment described in the present specification is merely the most preferred embodiment of the present invention, and does not represent all the technical ideas of the present invention, so that various equivalents And variations may be made. On the other hand, in the drawings, the same or similar reference numerals are given to the same or equivalent elements in the drawings, and, in the entire specification, when a component is referred to as being "comprising" But may include other components.

FIG. 1 is a plan view and a front view of a modular truss girder 200 (hereinafter abbreviated as 'girder') according to an embodiment of the present invention, and FIG. 2 is a sectional view of the girder 200. For convenience of explanation, the longitudinal direction of the temporary bridge 10 will be described as a longitudinal direction and the width direction as a lateral direction.

The girder 200 according to Figs. 1 and 2 constitutes a mold of the temporary bridge 10 of Fig. The hypothetical bridge 10 includes a vent 100, a girder 200, and a flat plate 300, as in the case of a conventional hypothetical bridge. The plurality of vents 100 are installed upright at predetermined intervals on the ground according to the length of the temporary bridges 10, and include the piers or alternations of the temporary bridges 10. The plurality of girders 200 constituting the mold are connected in the lateral direction and the longitudinal direction, and are mounted on the plurality of vents 100 to be coupled. The flat plate 300 is mounted on the upper portion of the mold. In the figure, the flat plate 300 is omitted in FIG. 9 and is mounted on a top of a plurality of transversely connected girders 200 (200A, 200B) as shown in FIG. The girder 200 according to the present invention may be manufactured in the form of a box in the form of a module as described below, and then bolted to the girders 200 without welding in the field construction. Since the connection to the vent 100 is possible, it is possible to remarkably improve the workability in the process of removing and attaching the girder 200 at the time of constructing the temporary bridge 10, and to improve the possibility of recycling the recovered girder 200 It is one of the features.

1 and 2, the girder 200 is a truss girder for a suspended bridge having a box-shaped body having a truss structure, and the upper girder 200 is disposed in parallel in a longitudinal direction so as to have a rectangular cross- A group of frames 210u, 210u ', 210b, 210b'; And a plurality of belt units 220 provided in a circumferential direction at a unit position in the longitudinal direction of the group of frames 210u, 210u ', 210b, and 210b', and these modules are manufactured in advance .

In the embodiment, the group of frames 210u, 210u ', 210b and 210b' constitutes the outermost side of the body of the rectangular box-shaped girder 200, and two upper frames 210u and 210u ' The frames 210b and 210b 'are provided in two total of four frames. In particular, each frame is an' a 'shaped steel which is advantageous for lateral load resistance, and the inside of the' a 'shaped steel is opposed to the inside of the body of the girder 200 It is preferable to exclude the lateral extension of the girder 200 or interference with other component elements such as the vent 100 or the flat panel 300 during the construction of the temporary bridge 10.

Although it is possible to connect and fix the group of frames 210u, 210u ', 210b and 210b' in this modular girder 200 by means of the belt unit 220, a group of frames 210u and 210u ' 210b, 210b 'in the longitudinal, transverse, and diagonal directions, and may further include a vertical truss unit 230 and a horizontal truss unit 240 selectively.

The vertical truss unit 230 serves to supplement longitudinally fixed support for a group of frames 210u, 210u ', 210b, 210b' in space, and includes a plurality of plate-like support elements 232 do. More specifically, the plurality of plate-like support elements 232 are disposed on the left and right sides of the body of the girder 200, so that the 'a' shaped section elements of the pair of frames 210u, 210b, 210u 'and 210b' And welded to the inside. In this case, the vertical truss unit 230 is provided between the belt units 220 to avoid interference with the belt unit 220 coupled to the frame at a predetermined interval in the lengthwise unit position of the body 200 do. In the embodiment, the vertical truss units 230 are illustrated as being provided in a total of six units on the basis of one girder 200 on the left and right sides of the body of the girder 200.

The transverse truss unit 240 serves to supplement the transverse and diagonal fixed support for a group of frames 210u, 210u ', 210b, 210b' in space, and a plurality of plate-like support elements 242 0.0 > 244 < / RTI > The horizontal flange 244 is welded and joined to the inside of the a-shaped steel surface element of the pair of frames 220u, 220u ', 220b, and 220b' that are disposed on the upper and lower surfaces of the body of the girder 200 and are adjacent to each other in the left- . The lateral flange 244 provides an engaging position of the support element 242 and is provided as a 'shaped' steel favoring lateral load and compressive resistance. The plurality of plate-like support elements 242 are arranged in an 'x' -shape from the inside of the body of the girder 220, and are arranged on the end side of the pair of horizontal flanges 244 arranged in parallel vertically, As shown in Fig. In this case, in order to avoid interference with the belt unit 220 coupled to the frame at a predetermined interval at the unit position in the longitudinal direction of the body 200, the horizontal truss unit 240 is disposed between the belt units 220 And is provided at a position where it does not interfere with the vertical truss unit 230. In the embodiment, the horizontal truss unit 240 is provided as a total of three units based on one girder 200 inside the body of the girder 200.

The belt unit 220 basically functions as a media member for connecting and extending the girder 200 in the lateral direction and the longitudinal direction and for connecting the girder 200 and the vent 100. As described above, Are provided at a plurality of intervals at regular intervals in the unit direction of the frame longitudinal direction. Each of the belt units 220 includes a plurality of plate members 220u, 220u ', 220s and 220s' welded to an adjacent frame, Direction.

Each of the plurality of plate members 220u, 220u ', 220s and 220s' is provided with bolts 210a and 210b provided for connecting and extending in the lateral and longitudinal directions between the girders 200 and for connecting between the girder 200 and the vents 100, And a fastening hole 222 is provided. In each of the plurality of plate members 220u, 220u ', 220s, 220s', it is preferable that the bolt fastening holes 222 are provided in plural to secure the fastening strength at the time of connection and alleviate the connection tolerance.

The plate member provided on the side surface of the belt unit 200 installed in the middle of the girder 200 among the plurality of plate members 220u, 220u ', 220s and 220s' The other plate members have a joint plate 260 for longitudinal connection between the girders 200 to be described later, a pair of grooves 240 for the girder 200, A relatively large number of bolts are required to secure the coupling strength with the momentum reinforcing plate 270 for minimizing the influence of the moment and the diaphragm plate assembly 280 for connection between the girder 200 and the vent 100, And has a male bolt fastening hole 222.

The belt unit 220 is provided at a plurality of predetermined intervals along the longitudinal direction of the girder 200. The belt unit 220 includes a pair of belts 200 for relieving the influence of the moment on the girder 200, It is preferable to include at least one or more of the vertical truss unit 230 and the horizontal truss unit 240 between the units 220. In this case, a region where a pair of belt units 220 and a vertical truss unit 230 and a horizontal truss unit 240 installed therebetween are installed in one bent fixed portion (Se, Sm) in the girder 200, In this embodiment, it is exemplified that the bent securing portions Se and Sm are formed as three regions based on one girder 200. The number of the bent securing portions (Se and Sm) The length of the girder 200 and the number of the vents 100 coupled to the one girder 200.

Each of the plurality of belt units 220 may be spaced d (du, ds) from the interface between the frames 210u, 210u ', 210b, and 210b'. This prevents the belt units 220 of the adjacent girders 200 from interfering with each other in the process of connecting the girders 200 in the lateral direction, The area can be easily secured without interfering with the belt unit 220. For this, in the embodiment, the plate members 220s and 220s' constituting the side surface of the belt unit 220 and the plate member 220u constituting the upper surface are welded and moved in the inner direction of the frame .

Figs. 3 and 4 show schematic diagrams of lateral and longitudinal connections of the girder 200. Fig.

3, the lateral connection of the girder 200 may be performed by directly bolting the belt unit 220 between the transversely adjacent girders 200A and 200B, A spacer 250 may be interposed between the belt units 220 of the adjacent girders 200A and 200B as shown in FIG. The spacer 250 is bolted to the side plate members 220s and 220s' of the belt unit 220. The spacers 250 are arranged to contact the two girders 200A and 200B in the lateral direction and are spaced apart from each other by the spacing spaces existing between the adjacent belt units 220, Thereby making the lateral connection state between the two girders 200A and 200B more robust. The spacer 250 may be provided on either side of the girder module 200, or may be provided as a separate part.

3B, the field installation on the lateral connection between the girders 200 is performed by fixing the spacer 250 to one side of the belt unit 220 of the reference girder 200A by bolt- 200C, and 200D, which are laterally added, through the bolt fastening holes 222 of the adjacent belt unit 220 while sequentially arranging the girders 200B, 200C, and 200D. The lateral expansion between these girders 200A, 200B, 200C and 220D can be performed before and after mounting the vent 100. As a result, in the present invention, it is possible to laterally expand the girders 200 by a simple method in which the girders 200 are preliminarily manufactured in the form of a box-shaped module and then bolted without welding.

4, the longitudinal connection of the girder 200 is achieved by connecting the belt unit 220 between longitudinally adjacent girders 200A, 200B to the junction plates 260 (260u, 260u ', 260s, 260s') And bolts are tightened by using the bolts. In the embodiment, the bonding plates 260 are provided in total of four (260u, 260u ', 260s, 260s') on the upper and lower sides and the left and right sides of the belt unit 220, and the respective bonding plates 260 (260u, 260u' 260s and 260s' are formed with bolt fastening holes corresponding to the fastening holes 222 of the plate members 220u, 220u ', 220s, 220s' constituting the belt unit 220. [

As shown in Fig. 5 (a), in the field construction for vertical connection between the girders 200, four girder plates 260u (260u) and 260u , 260u ', 260s, and 260s' on the upper and lower sides and the left and right sides of the adjacent belt unit 220, respectively. The lateral expansion between the girders 200A and 200B can be performed before and after mounting the vent 100. As a result, in the present invention, longitudinal extension between the girders 200 is possible by a simple method of pre-fabricating the girder 200 in the form of a box-type module and bolting without welding.

As described above, since the belt unit 220 is provided to be spaced inside the interface of the frames 210u, 210u ', 210b, and 210b', the bonding plate 210u ', 210b, 210b' in a state of being coupled to the plate members 220u, 220u ', 220s, 220s' of the belt unit 220, And does not fall outside the outermost boundary. Accordingly, even if the girder 200 extended in the longitudinal direction is extended in the lateral direction or the laminate 300 is stacked on the girder 200, the joining plates 260u, 260u ', 260s, 260s' There is no phenomenon that interference occurs.

5 and 6 are schematic views showing the connection between the girder 200 and the vent 100 constituting a part of the temporary bridge 10.

Referring to FIG. 5, the vent 100 may be a truss structure or a pile-shaped bulk structure, and specifications such as installation intervals and widths thereof are predetermined in advance according to design specifications. In the embodiment, a pair of vent upper members 110 are arranged and fixed to the upper ends of the vents 100 in the width direction or the transverse direction of the temporary bridge 10 for connection with the girder 200, The upper member 110 is exemplified as an H-shaped steel. The girder 200 is divided into a plurality of bent securing sections Se and Sm in the longitudinal direction thereof (refer to FIG. 1), and joined to the vent 100 at the respective bent securing sections Se and Sm . In the embodiment, a pair of belt units 220 are provided in each of the vent fixing portions Se and Sm, and a vent upper member 110 is coupled to each of the belt units 220.

Referring to FIG. 6, the connection between the belt unit 220 and the vent 100 is performed via a calibration plate assembly 280. The calibration plate assembly 280 simplifies installation, To relieve the connection tolerance between the vent 220 and the vent upper member 110. Specifically, in an embodiment, the diaphragm plate assembly 280 comprises a pair of upper and lower lower plates 282 and 284, the lower upper and lower plates 282, The upper and lower abacus plates 282 and 284 are bolted to a plate member 220s' of the upper and lower abacus plates 220 and 220 and welded to the vent upper member 110 to alleviate connection tolerances. It is possible to easily construct the connector 284 by bolt fastening. In other words, the upper reservoir plate 282 is pre-installed in the lower surface of the girder 200 extending in the lateral direction and the longitudinal direction in a bolt-fastening manner, and the position of the lower reservoir plate 284 is finely The welding workability can be greatly improved by bolting both the upper and lower training plates 282 and 284 after welding to the upper member 110 of the vent.

FIGS. 7 and 8 show a state diagram of an installation of the momentum reinforcing plate 270 selectively provided on the girder 200, and a diagram for improving the resistance of the relative moment therebetween.

7, the force moment reinforcing plate 270 is mounted on the belt unit 220 at the upper part of the girder 200, and when the one girder 200 is taken as a reference, (Se, Sm) region. Also, in the case where a plurality of girders 200 are extended in the longitudinal direction, irrespective of the drawings, the momentum reinforcing plate 270 may be mounted between the belt units 220 between the girders 200, (260, 260u, 260s, 260s') for longitudinal connection of the belt unit 200 to the belt unit 220 can be mounted thereon.

The mandrel reinforcing plate 270 is a plate-like member having a width on the upper surface or a width smaller than the upper surface of the belt unit 220. A plurality of fastening holes are formed on both ends of the fastening holes so that bolts can be fastened to the belt unit 220. In addition, in order to prevent the plate 270 from being sagged in a downward direction when the plate 270 is stretched in the state that the plate 270 is installed, and to improve the rigidity of the plate 270 itself, A pair of reinforcing bars 272 in the form of a section can be welded.

As described above, since the belt unit 220 is provided to be spaced inward from the interface between the frames 210u, 210u ', 210b, and 210b', the force moment reinforcing plate 270 includes the belt unit 220, 210u ', 210b, 210b' in a state of being coupled to the upper side plate member 220u of the frame 210u. Thus, even if the laminating plate 300 is stacked on the upper portion of the girder 220, the phenomenon that the fastening elements such as the momentum reinforcing plate 270 or the bolts are interfered does not occur.

8, when comparing the case where the above-described mandrel reinforcing plate 270 is mounted (FIG. 8B) and the case where it is not mounted (FIG. 8A), when the tensile stress is applied The effect of upward movement of the center line (y) on the girder section in the sidewalls section (Se and Sm) and the effect of increasing the moment of inertia of section (I) The tensile stress s can be effectively reduced. In the drawings, the notation M denotes a moment, which is a negative moment when tensile stress is applied to the upper surface of the section, and a positive moment when tensile stress acts on the lower surface of the section. 8, the belt unit 220 is omitted.

9 is a schematic view showing an installation structure of the girder 200 according to the embodiment of the present invention. In the embodiment, in consideration of the total length of the temporary bridge 10 and the spacing between the vents 100, two types of girders 200A, 200B having different lengths, for example, as shown in FIG. 9A, 200B) is applied. That is, the girder 200 according to the present invention can be easily manufactured to different standards according to the standard of the temporary bridge 10 to be installed. As shown in FIG. 9 (b) On the basis of the detailed component design described above for each of the girders 200, 200A, 200B having different specifications, good lateral and longitudinal scalability can of course have good on-site construction for installation and disassembly.

As described above, according to the modular truss girder for a temporary bridge of the present invention and its installation structure, a box-shaped module type girder 200 having a belt unit 220 in the circumferential direction at a unit position in the longitudinal direction of the body is manufactured in advance Disassembling process between the horizontal and vertical girders 200 and the dismounting process between the girders 200 and the vents 100 is simply performed through the corresponding belt unit 220 without welding in situ, The possibility of recycling the recovered products such as the back girder 200 can be greatly improved. According to the present invention, since the belt unit 220 is installed inside the frames 210u, 210u ', 210b and 210b', interference between the lateral and longitudinal girders 200 and the connection 300 can be effectively eliminated and the jointability between the girder 200 and the vent 100 can be improved by the cross assembly 280 and the connection tolerance can be alleviated. ), It is possible to minimize the influence of the moment at the connection point of the vent when the long span is constructed, thereby facilitating long span construction.

The foregoing is a description of specific embodiments of the present invention. As described above, the embodiments according to the present invention are disclosed for the purpose of illustration and are not to be construed as limiting the scope of the present invention. Those skilled in the art will understand that the present invention is not limited thereto It is to be understood that various changes and modifications are possible. It is therefore to be understood that all such modifications and alterations are intended to fall within the scope of the invention as disclosed in the following claims or their equivalents.

10: Hypothetical bridge
100: vent
110: Vent upper member (H-shaped steel)
200, 200A, 200B, 200C, 200D: girders
210u, 210u ', 210b and 210b': frame (a section steel)
212: first flange
214: second flange
220: Belt unit
220u, 220u ', 220s, 220s': plate member
222: fastening hole
du, ds:
230: vertical truss unit
232: Support element
240: Horizontal truss unit
242: Support element
244: Horizontal flange (a section steel)
250: Spacer
260, 260u, 260u ', 260s, 260s'
270: Parent Strengthening Plate
272: Reinforcing bar (a section steel)
280: Plate plate assembly
282: Upper calibration plate
284: Lower calendar plate
300:
Se and Sm:

Claims (17)

A truss girder for a suspended bridge having a box-shaped body having a truss structure, comprising: a group of frames arranged in parallel in a longitudinal direction such that the girder body has a rectangular cross section; And a plurality of belt units provided in a circumferential direction at a group of frame longitudinal direction unit positions to constitute one module,
Wherein each of the plurality of belt units comprises a plurality of plate members coupled to adjacent frames, a plurality of fasteners is formed in each of the plurality of plate members,
Wherein each of said plurality of belt units is provided spaced inwardly of an interface of said frame,
The transverse connection between the girders is a method of bolting the belt unit between adjacent girders in the transverse direction,
Wherein the truss girder for the temporary bridge further comprises a diaphragm plate assembly coupled to the belt unit and the vent when the girder is connected to the vent and the diaphragm plate assembly is provided in a pair of upper and lower lower plates, Characterized in that the upper schedule plate is bolted to the belt unit and the lower schedule plate is welded to the upper surface of the vent while the upper schedule plate and the lower plate pair are bolted. The truss girder according to claim 1, wherein the frame is an 'a' steel section, and the inside of the 'a' section steel is disposed so as to face the inside of the girder body. delete delete delete 2. The truss girder of claim 1, further comprising a spacer interposed between adjacent intergard belt units in the transverse direction in the inter-girder transverse connection. 2. The truss girder of claim 1, further comprising a joint plate bolted to each of the inter-girder belt units in the longitudinal direction during longitudinal connection between the girders. delete delete The girder according to claim 1, further comprising: a momentum reinforcing plate bolted to each other between the belt units arranged in the longitudinal direction of the girder, wherein the momentum reinforcing plate is provided on the upper surface of the installed girder Truss girder for. The truss girder according to claim 1, further comprising a plurality of vertical truss units provided on side surfaces of the girder body to support adjacent frames. The truss girder according to claim 1, further comprising a plurality of horizontal truss units provided in the inside of the girder body to support a frame in a diagonal direction. 13. The truss girder of claim 12, wherein the transverse truss units are provided on opposite side surfaces of the girder body and are coupled to a horizontal flange supporting an adjacent frame. A plurality of vents standing upright on the ground at regular intervals; A plurality of molds mounted on top of the plurality of vents; And a hollow plate mounted on the upper portion of the mold,
Wherein each of the plurality of molds is a truss girder for a temporary bridge having a box-shaped body having a truss structure, the frame being arranged in parallel in a longitudinal direction so that the girder body has a rectangular cross-section; And a plurality of belt units provided in a circumferential direction at a group of frame longitudinal direction unit positions,
Wherein each of the plurality of belt units comprises a plurality of plate members coupled to adjacent frames, a plurality of fasteners is formed in each of the plurality of plate members,
Wherein each of said plurality of belt units is provided spaced inwardly of an interface of said frame,
Wherein the transverse connections between the girders are made by bolting the belt units and the longitudinal connections between the girders are made through a joint plate bolted to each of the belt units of the adjacent girders,
Wherein the connection between the girders and the vents is via a diaphragm plate assembly coupled to the upper surface of the belt unit and the vent, the diaphragm plate assembly being provided in a pair of upper and lower lower plates, Bolt fastened to the unit and welded to the upper surface of the vent, wherein the upper plinth plate and the lower plate pair are bolted together. 15. The structure of claim 14, further comprising a spacer interposed between adjacent inter-girder belt units in the inter-girder transverse connection. 15. The belt tensioner according to claim 14, further comprising: a momentum reinforcing plate bolted to each other between the belt units arranged in the longitudinal direction of the girder, wherein the momentum reinforcing plate is provided on the upper surface of the installed girder, Wherein the bridge structure is provided with a bridge structure. delete

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