KR101545329B1 - Temporary bridge - Google Patents

Abstract

The present invention relates to a prefabricated bridge for reinforcing a fulcrum portion by tension, and is a bridge for connecting a girder to a girder by reducing the moment of inertia and the momentum by introducing a tensional force at a point where the girder and the girder are connected, .
The prefabricated bridge for reinforcing the fulcrum portion by tensions according to the present invention comprises two or more support members 10, 20 spaced apart from each other at a predetermined interval; A girder 30 formed of a combination of a plurality of steel plates and installed on the support material; The tension bar is fixed to the girder and the girder by vertically tightening the upper and lower portions of the girder and the girder, ). ≪ / RTI > The tense steel bar is connected to the fixing bracket fixed to the support, while the upper portion is connected to the recess formed in the bottom plate so as to be tense without protruding from the upper surface of the bottom plate.

Description

[0001] TEMPORARY BRIDGE [0002]

More particularly, the present invention relates to a bridge capable of reducing the moment of inertia and the momentum by introducing a tension force at a point where the girder is connected to the girder, In which the fulcrum portion is reinforced by means of an adhesive.

Hybrid bridges are installed and used for various purposes such as ensuring bypass roads during road construction, crossing of vehicles when repairing the bridge, crossing overpasses of roads with heavy traffic, and bridges for working according to port facilities.

In the conventional method of installing a temporary bridge, a plurality of beams are connected to each other to form a temporary vent, and an I-shaped girder is mounted thereon. Then, the temporary bridge is integrally welded with the temporary vent, And a method of temporarily installing the vehicle so that a vehicle or a person can pass through the bridge is used. However, since the conventional suspension bridge has a short span of usually 5.0 to 8.0 m, there is a problem that application to the field is considerably deteriorated. This is because there is a possibility that the river is flooded due to the decrease of the cross section of the passageway due to the suspended material being caught in the short-span bridge due to the flood during the flood period due to the shortage of the bridge. .

Recently, prestressing method using tension material or steel wire is mainly used for construction of long interspaces, and prestressing method is a method of introducing tension force by providing tension material and fixing device at the lower end of I- A bridge of a length of about a meter can be realized.

However, this method has limitations on the introduction of prestressing, and it is possible to cancel the stress to some extent. However, it is not expected to increase the rigidity of the I-type girder due to the introduction of prestress by the tensional material. Since the I beam is applied, it can not effectively cope with the deflection and vibration of the hypothetical bridge, so there are many restrictions in use. In other words, although it is possible to use a large girder in terms of the stress, since the rigidity of the I-girder is low, relatively large deflections are generated.

In this paper, we propose a method to reduce the deflection by applying overlapping beams to the I - shaped girder where the moment is generated. However, theoretically, no stress acts on the neutral axis of the overlapping beam, It is economically disadvantageous that the construction cost is increased according to the production of the overlapped beam, and the construction of the temporary bridge becomes complicated.

In addition, even if the deflection is reduced by the overlapping beam, the binding force between the girder and the support material is weak, so that the momentum generated in the girder can not be reduced, so that a compressive force is applied to the upper portion of the girder, and a tensile force is applied to the bottom portion. There is a problem that the bond between the electrodes is destroyed.

Published Japanese Patent Application No. 10-2013-0067017 Patent No. 10-0341443

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a prefabricated bridge which reinforces a fulcrum portion to which a girder and a support are connected by a tensional force, There is a purpose.

Another object of the present invention is to improve the workability by assembling a girder by assembling a steel plate.

The prefabricated bridge for reinforcing the fulcrum portion by tense according to the present invention comprises two or more support members spaced apart from each other at a predetermined interval; A girder formed of a combination of a plurality of steel plates and installed on the support; And at least one tension member arranged vertically on a fulcrum portion where the support member and the girder are connected to each other, the upper portion and the lower portion being capable of tensioning the girder and the support member and fixing the support member and the girder by a tension force, .

The tension member is one selected from a tensile steel bar and a steel bar which are connected to the fixing bracket fixed to the support member so that the upper portion is inserted into the concave portion formed in the bottom plate and is not protruded from the upper surface of the bottom plate so as to be tense .

Preferably, one or more girder supports interposed between the top of the support and the bottom of the girder support the support to support the girder.

And the girder is formed by assembling a steel plate without a liner plate.

According to the prefabricated bridge which reinforces the fulcrum portion by the tension according to the present invention, by fixing the girder and the support material and reinforcing the fulcrum to which the girder and the support are connected by introducing the tension to the girder and the support material through the tie, It is possible to increase the safety of the prefabricated bridges and to increase the span of the bridges so that the construction cost can be reduced and the air can be shortened.

In addition, it is possible to improve the workability by assembling the girders by assembling various types of steel plates.

In addition, in the case where the interval between the girders is minimized to minimize the number of the girders (Fig. 5), the interval between the girders is narrowed due to the limitation of the conveying route (Fig. 6) 8). The application of various types of riverbed plates according to the site conditions is excellent in the field application.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a front view of a prefabricated bridging structure for reinforcing a fulcrum portion by tension according to Embodiment 1 of the present invention; Fig.
2 is a side view of a prefabricated bridging structure for reinforcing a fulcrum portion by tension according to Embodiment 1 of the present invention.
Fig. 3 is a view showing an installation state of a tense steel bar applied to a prefabricated bridge bridging a fulcrum portion by tension according to Embodiment 1 of the present invention. Fig.
Fig. 4 to Fig. 7 are views showing examples of a girder applied to a prefabricated bridging which reinforces a fulcrum portion according to the first embodiment of the present invention. Fig.
Fig. 8 is a front view of a prefabricated bridge that reinforces a fulcrum portion by tension according to Embodiment 2 of the present invention; Fig.
Fig. 9 is a front view of a prefabricated bridge that reinforces a fulcrum portion by tension according to Embodiment 3 of the present invention; Fig.

≪ Example 1 >

As shown in FIG. 1, the prefabricated bridges that reinforce the fulcrum portion by tensions according to the present embodiment include first and second support members (temporary vent) 10, 20 that are erected at a predetermined interval from each other; A girder 30 mounted on the first and second support members 10 and 20; A packing layer (40) formed on the upper surface of the girder (30); And a handrail 50 erected on both sides of the girder 30. The girders 30 are installed at a portion where the first and second girders 10 and 20 are connected to the girders 30, 10 and 20 and a tensile steel bar 60 of a tensile material firmly reinforcing both sides of the girder 30. [

The first support members 10 have the same structure and include a plurality of column members 11 (a H-shaped beam, a circular steel pipe or the like) fixed on the bottom of a river and arranged at regular intervals from each other, a column member 11, (Beam, I-beam, angle, steel pipe, etc.) for connecting the connecting members 12 to each other, and the connecting members 12 are arranged at two or more positions Respectively. In addition, a plurality of inclined stiffeners 13 may be applied to firmly assemble the column 11 and the connecting member 12.

The second support member 20 has the same structure as the first support member 10 and is composed of a column member 21, a connecting member 22 and an inclined reinforcement member 23.

The girder 30 is installed through one or more girder supports 100 (various structures such as H beams, angles, and boxes are applicable) installed on the first and second support members 10 and 20 to form a bottom portion of the bridge, When a tensile force is introduced by the tension steel bar 60, the end of the girder 30 is fixed to the girder fixing beam 70 through the angle 73.

As shown in FIG. 3, the girder fixing beam 70 is an I-shaped beam, an H-shaped beam, or the like in an I-shaped form on the basis of the installation condition, and a reinforcing plate 71 for fixing and reinforcing is attached to both left and right sides. (Bolt and nut) or welding to the upper portion of the first support member 10 while the upper portion is fixed to the girder 30 via the angle 73. [ The upper flange is fixed to the bottom surface of the girder 30 with a fastener (bolt and nut) 74 and the vertical portion is fixed to the reinforcing plate 71 of the girder fixing beam 70 (Bolt and nut) 75 or by welding.

Of course, the girder fixing beam 70 can be directly fastened to the bottom surface of the girder 30 without using the angle 73. [

The girder 30 according to the present invention is composed of a combination of various types of steel plates, which will be described in detail below. First, the tension steel rod 60 of the tension member is assembled with the first and second support members 10, Will be described.

The girder 30 is arranged on the upper side of the first and second support members 10 and 20 in the transverse direction orthogonal to the first and second support members 10 and 20 and the tensile steel bar 60 is disposed on the first and second support members 10 and 20 The upper portion is fixed to the girder 30 and the lower portion is fixed to the first and second support members 10 and 20, respectively, in order to assemble and tense the girders 30 and 20, One or more of them is connected so as to be able to relax.

3, the tensile steel bar 60 can have various shapes such as a circular shape and a rectangular shape, and the girder 30 and the first support member 10 can be connected to each other through the structure (structure of the girder 30 and the first support member 10) The upper and lower portions are fixed to the girder 30 and the first support member 10, respectively, while the reinforcing steel rods 60 are closed.

The fixing portion 61 and the tension member 63 on the upper portion of the tensile steel bar 60 are formed on the girder 30. The fixing portion 61 and the tension member 63 are fixed to the upper portion and the lower portion of the tension steel bar 60, The reinforcing bar 60 is formed so that the upper portion of the tension bar 60 does not protrude from the upper surface of the girder 30. In other words, the tension barrel 63 has a concave portion 31 So that the tension rod 60 is tensed.

The lower fixation unit 62 is fixed to the first support member 10 via the fixing bracket 65. [ The fixing bracket 65 is applied when the lower fixing portion 62 can not be directly fixed to the first support member 10 and is fastened to the column member 11 of the first support member 10 ) Or welded.

The fixing bracket 65 is composed of an H-beam, an I-beam, an angle, a combination of plates, an H-beam or an I-beam, or a combination of an angle and a plate.

The lower fixing unit 62 passes through the fixing bracket 65 and the tension member 64 is fixed to the lower fixing unit 62 while being supported by the bottom surface of the fixing bracket 65.

The location and quantity of the tension steel rods 60 are not limited to those shown in the drawings.

The tension steel bar 60 is an example of a tension member and can be replaced with a tensionable steel wire.

According to the connection between the first and second support members 10 and 20 and the girder 30 by the tension steel rods 60, the momentum is reduced by reinforcing the parent parts on both sides, which is structurally very stable.

Hereinafter, the girder 30 will be described in detail.

The girder 30 is composed of a bottom plate and a mold, and the bottom surface of the mold may protrude to the bottom of the bottom plate, or may be the same as the bottom of the bottom plate.

1. Girders composed of outer two-plate steel plate.

As shown in Fig. 4, a combination of the river bed plates 31 is formed.

The steel plate 31 is composed of first and second cast parts 31b and 31c protruding toward the bottom at both left and right ends of the bottom of the bottom part 31a and the bottom part 31a. The steel plate 31 having such a structure is preferably in the form of a box having a predetermined thickness, for example, a combination of an upper plate, a lower plate and a side plate, or a combination of an I-beam or an H-beam combined with a plate.

The girders 30 are fastened with fasteners (bolts and nuts) to neighboring portions (the first and second main portions 31b and 31c and the bottom portions 31a and 31a adjacent to each other) Assembled or welded.

2. A girder consisting of a cantilever 2 cast steel plate.

5, the steel plate 32 includes first and second cast parts 32b and 32c which are protruded from the left and right sides of the bottom surface of the bottom part 32a and the bottom part of the bottom part 32a, ), And is a cantilever type in which both sides of the first and second main portions 32b and 32c are protruded.

In the steel plate 32 having such a configuration, a plurality of neighboring portions (the bottoms 32a and 32a) are fastened with fasteners or assembled by welding.

According to this example, the interval between the girders 20 can be increased, and the number of the girders 30 can be minimized.

3. A girder consisting of a cantilever 1 cast steel plate.

6, the steel plate 33 includes a bottom 33a and one main portion 33b protruding toward the bottom at the center of the bottom of the bottom portion 33a, And a cantilever type in which both sides protrude from the center.

In the steel plate 33 having such a configuration, a plurality of neighboring portions (bottom portions 33a and 33a) are fastened with fasteners or assembled by welding.

It is effective to narrow the interval of the girders 30 due to the limitation of the conveying route.

4. Girder by combination of 1st and 2nd steel plate.

As shown in Fig. 7, the girder 30 is composed of a combination of a first steel plate 34 and a second bottom plate 35 having a receiving portion (a plurality of turns are repeatedly assembled alternately).

The first riverbed plate 34 is composed of first and second cast parts 34b and 34c formed on the left and right sides of the bottom surface of the bottom part 34a and the bottom part 34a. The first and second main portions 34b and 34c are formed to protrude sideways from the bottom portion so that a receiving portion 34d is formed between the first and second main portions 34b and 34c. That is, the receiving portion 34d is formed with the bottom portion 34a as a side wall and the first and second main portions 34b and 34c as a bottom portion.

The second steel plate 35 is a box-like structure without a casting portion, and both sides of the steel plate 35 are fixed to the receiving portion 34d of the adjacent first steel plate 34 and are assembled by fastening or welding.

When a work platform is needed between girders (30), various types of steel plate are applied according to the conditions of the site.

5. Girder by fitting method of 1st and 2nd steel plate.

As shown in FIG. 8, a combination of a first steel plate 36 and a second steel plate 37 with fitting grooves is repeatedly assembled.

The first riverbed plate 36 is composed of a bottom portion 36a provided with a fitting groove 36b and first and second main portions 36c and 36d formed on the left and right sides of the bottom surface of the bottom portion 36a . The fitting groove 36b may be formed in various ways according to the structure of the bottom portion 36a and the first and second main portions 36c and 36d. For example, the top and bottom plates of the bottom portion 36a A fitting groove 36b which is laterally opened is formed between the upper plate and the bottom plate and the side plate so as to be longer than the side plate.

The second riverbed plate 37 is a box-like structure without the fitting groove 36b and the first and second casting sections 36c and 36d of the first riverbed plate 36 and the first riverbed plate 36 (Not shown).

When a work platform is needed between girders (30), various types of steel plate are applied according to the conditions of the site.

≪ Example 2 >

As shown in FIG. 8, the prefabricated bridges that reinforce the fulcrum portion by the tension according to the present embodiment are continuous span prefabricated bridges, and a third support material 80 is provided between the first and second support materials 10, 20.

The girder 30 is connected to the first, second and third support members 10, 20 and 80 by at least one tension steel bar 60 so that the first and third support members 10 and 80 and the third and second support members 80, 20 and the third support member 80 can reduce the momentum.

The structure of the third support material 80 and the girder 30 is the same as that of the first embodiment and the connection structure of the girder 30 and the third support material 80 by the tension steel bar 60 is also the same as that of the first embodiment A detailed description thereof will be omitted.

≪ Example 3 >

As shown in FIG. 9, the prefabricated bridges that reinforce the fulcrum portion according to the present embodiment are continuous span prefabricated bridges. When the margin of the bridging space is large, the third support 80 is wider than the third support 80 A wide support bracket 90 is applied.

The support bracket 90 may be composed of a horizontal member 91 raised on the upper portion of the third support member 80, an inclined reinforcing member 92 connecting the horizontal member 91 and the third support member 80, and the like.

A girder support 100 is provided on the upper portion of the horizontal member 91 to support the girder 30 through the support bracket 90. The tension steel bar 60 has the same structure as that of the second embodiment, Tie the three support materials (80).

According to the present embodiment, the supporting bracket 90 can reduce the length of the supporting span and bind the girder 30 and the third supporting member 80 with a small tension.

10,20: 1st and 2nd support materials, 30: girder
40: packing layer, 50: railing
60: tension steel bar, 70: girder fixing beam
100: girder support,

Claims (9)

Two or more support members separated from each other at regular intervals;
A girder 30 formed of a combination of a plurality of steel plates and installed on the support material;
And a fixing part for fixing the upper and lower fixing parts to the girder and the support material, respectively, the upper and lower fixing parts being disposed on the supporting part connected to the supporting part and the girder, And one or more tension members for fixing and supporting the support member and the girder by a tension force by being fastened to the upper and lower fixing members, respectively,
A girder support (100) which is seated on the support material and supports the girder at a bottom portion thereof;
A fixing beam 70 interposed between the support material and the girder while being spaced apart from the girder support and fixed to the support material and the girder after being strained by the tension material and fixing the support material and the girder to each other through the tension material, Characterized in that the prefabricated bridges reinforce the fulcrum portion by tension.
delete delete The girder according to claim 1, wherein the girder comprises a bottom plate (31a) and a bottom plate (31) composed of first and second main parts (31b, 31c) protruding toward the bottom at both left and right ends of the bottom surface of the bottom part Wherein the reinforcing bridges are reinforced by a tensile force. The girder according to claim 1, wherein the girder comprises a bottom portion (32a) and first and second main portions (32b, 32c) protruding from the left and right sides of the bottom of the bottom portion inwardly (32) are joined to each other. The prefabricated bridges reinforce the fulcrum portion by tension. The girder according to claim 1, wherein the girder is combined with a steel plate (33) composed of a bottom (33a) and a main part (33b) protruding toward the bottom at the center of the bottom of the bottom part Prefabricated bridges that reinforce the fulcrum by tension. The girder according to claim 1, wherein the girder is supported by a first steel plate (34) having a receiving portion (34d) on both right and left sides and a receiving portion (34d) of the first steel plate (34) And the first and second flat steel plates 34 and 34 are assembled to each other while alternately and repeatedly arranged and the first flat steel plate 34 is fixed to the bottom portion 34a and the left and right sides of the bottom surface of the bottom portion 34a And a first and a second main part (34b, 34c) formed to protrude laterally from the bottom part (34a) and form a receiving part (34d). The girder according to claim 1, wherein the girder includes a first steel plate (36) provided with a fitting groove (36b) opened laterally on both right and left sides and a second steel plate (36) fitted into a fitting groove (36b) of the first steel plate And a second steel plate 37 assembled through a fastening hole are alternately and repeatedly arranged. The first steel plate 36 has a bottom portion 36a provided with the fitting groove 36b, And the first and second casting parts 36c and 36d formed on the left and right sides of the bottom surface of the lower part 36a and the second steel plate 37 is inserted into the fitting groove 36b and then assembled The prefabricated bridges that reinforce the fulcrum portion by tension. 2. The method of claim 1, wherein the support material comprises a first and a second support material (10,20) on both sides in the longitudinal direction and a third support material (80) disposed between the first and second support materials, And a girder support (100) having a support bracket (90) having a width larger than that of the third support material and supporting the girder through the support bracket (90) at an upper portion of the third support material Prefabricated bridges that reinforce the fulcrum.

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