KR101023008B1 - Prestressed steel beam and manufacturing method thereof and temporary bridge using them - Google Patents

Abstract

PURPOSE: A steel beam, in which prestress is induced, a manufacturing method thereof, and a temporary bridge manufactured by using the same are provided to minimize the loss of prestress. CONSTITUTION: A steel beam, in which prestress comprises a main beam(10), a pair of prestressing beams(20), a spot pad(30), a pressurizing member. A pair of prestressing beam is located and fixed on the both lower parts of the main beam. The spot pad is inserted between the lower part of both end of the main beam and the upper part of the prestressing beam. The pressurizing member downwardly pressurizes both end of the main beam toward the prestressing beam.

Description

Prestressed steel beam and manufacturing method according to prestressed steel beam and manufacturing method and temporary bridge using them

The present invention relates to steel beams and prefabricated bridges using prestresses, and more specifically, to a temporary bridge using the same. More specifically, the steel beams can be manufactured quickly, have no loss of prestressing force, are simple to manufacture and construct, and the amount of steel used. The present invention relates to a steel beam in which prestress is introduced, a method of manufacturing the same, and a temporary bridge using the same, which can reduce the manufacturing cost and reduce the manufacturing cost and facilitate the temporary bridge construction.

In general, when constructing permanent bridges or repairing and expanding existing bridges, such as girders used for temporary bridges installed for the passage of vehicles or pedestrians or prefabricated bridges made of steel structures, such as H-beams, etc. Mandatory beams are used.

When the steel beam is used as the girder of temporary bridge or prefabricated overpass, the girder sags and breaks due to its own weight, fixed load such as perforated plate and pavement installed on it, and live load caused by traffic. .

Therefore, in the past, a technique for preventing sagging and breaking of girders has been widely used by using a steel beam in which prestress is introduced as a girder.

As a method for introducing prestress into a conventional steel beam, a tension material tension method and a steel plate attachment method are widely used.

Conventional steel bar or strand tension method is a method of attaching a predetermined fixing device to the lower flange or the abdominal plate of the girder, and a prestress is introduced by applying a tension force after mounting the tension member to be a steel bar or strand, Republic of Korea Patent Registration 10-0871831, Republic of Korea Patent No. 10-0556719, Republic of Korea Utility Model No. 20-0297321 is known.

However, since the conventional tension material tensioning method is constructed after the installation of the girder, the prestressing force introduced due to the nature of the indefinite structure is transmitted to the point portion rather than the center portion of the trunk, so that the prestress loss is very large.

Conventional steel plate attachment method is a method of introducing a pre-stress to the girder by attaching a steel sheet introduced with a tensile force through a predetermined method to the lower flange of the girder, Korean Patent Publication No. 10-2006-0100871.

However, the conventional steel plate attachment method is complicated manufacturing method of the girder and requires a specific equipment, the manufacturing cost is expensive, and may be a problem in transportation in the long-term.

The conventional temporary bridge structure is mostly connected to the upper and lower parts integrally to support the deformation caused by the temperature expansion and contraction of the upper structure with the rigidity of the lower structure, it is inevitable to increase the amount of steel due to the cross-sectional increase of the lower structure.

In addition, the Republic of Korea Patent Publication No. 10-2006-0100871 because the length of the upper girder and the lower girder is composed of equal lengths, there is a problem that the amount of steel is increased when viewed as a whole girder, the carrying load is increased, the problem of transport Will be revealed.

On the other hand, when constructing permanent bridges or repairing and expanding existing bridges, temporary bridges are constructed for the passage of vehicles and pedestrians, and temporary bridges are constructed for permanent bridges or repair of existing bridges. And after the completion of construction, such as expansion is to be removed.

Temporary bridges consist of steel girders with steel beams on top of steel piers, covering them with perforated plates, paving them with asphalt or asphalt, and installing handrails on both edges.

Since the girder may cause deflection and fracture of the girder due to its own weight, fixed loads such as perforated plates and pavements installed thereon, and live loads caused by traffic, etc., the girders are provided with prestresses that can cope with fixed loads and live loads. Doing.

However, in the conventional temporary bridge, the above-mentioned tension material tension method or steel plate attachment method is used to introduce prestress to the girder, thereby revealing the problems as described above.

It is an object of the present invention to provide a prestressed steel beam and a method of manufacturing the same, and a temporary bridge using the prestress using a long bolt to solve the problems in the conventional tension material tension method to minimize the prestress loss.

Another object of the present invention is to remove the upper structure and the lower structure in the point portion by minimizing the horizontal force transmitted to the lower structure by the temperature expansion and contraction to introduce the prestressed steel beams to significantly reduce the amount of steel of the lower structure and It is to provide a manufacturing method and a temporary bridge using the same.

Another object of the present invention is to solve the problems of the conventional steel plate attachment method to make the production of pre-stressed steel beams quickly and simply, to avoid the need for specific equipment and to reduce the cost of using the specific equipment It is to provide a steel beam with prestress using long bolts, a method of manufacturing the same, and a temporary bridge using the same.

Another object of the present invention is to solve the problems of the conventional steel plate attachment method to eliminate the problems in transportation even in the long span between the pre-stressed steel beams using a pre-stress and a manufacturing method and a temporary bridge using the same Is to provide.

The present invention, in order to achieve the above object, the main beam; A pair of prestressing beams fixed and disposed at both ends of the main beams such that inner ends thereof are positioned inward from both ends of the main beams; A pair of point pads inserted between the main beam and the prestressing beam at positions spaced from both ends of the main beam toward the middle; There is provided a pre-stressed forced beam which is provided between the main beam and the prestressing beam at both ends of the main beam, and includes a pressing means for pressing both ends of the main beam toward the prestressing beam.

The main beam and the prestressing beam are each formed of a section steel having an upper and a lower flange integrally formed at the upper and lower ends of the abdomen and the abdomen, and the pressing means includes an upper pressing member in contact with an upper surface of the lower flange of the main beam; And a lower pressurizing member contacting a lower surface of the upper flange of the prestressing beam, a pressurizing bolt penetrating the upper and lower pressurizing members up and down, and a pressurizing nut fastened to both ends of the pressurizing bolt.

The upper and lower pressurizing members are formed of a shape steel having an upper abdomen and upper and lower flanges integrally formed on the upper and lower ends of the abdomen, and the upper pressurizing member bracing is welded between the upper and lower flanges of the upper pressurizing member. The lower pressing material bracing is welded and fixed between the upper and lower flanges of the lower pressing material.

The upper pressurizing member bracing is welded and fixed to the upper flange of the upper pressurizing member and the lower surface of the upper flange of the main beam and the abdomen of the main beam.

The upper press member cuts a part of the lower flange so that the lower end of the abdomen is directly welded to the upper surface of the lower flange of the main beam, and the lower press member cuts a part of the upper flange so that the upper end of the abdomen is the main beam. It is directly welded to the lower surface of the upper flange of the.

A rubber support is inserted between the lower surface of the main beam and the upper surface of the prestressing beam at the installation position of the pressing means.

In addition, the present invention, in order to achieve the above object, the step of arranging a pair of pre-stressed beam spaced so that the inner end thereof corresponds to the inner side than both ends of the pre-stressing target main beam; Installing point pads on one or both ends of the pair of prestressing beams; Placing the main beam on the point pad such that the point pad is positioned inward of both ends of the main beam; Installing pressing means between both ends of the main beam and the point pad; And pressing down both ends of the main beam toward the prestressing beam by using the point pad as a point.

The main beam and the prestressing beam use a section steel consisting of upper and lower flanges integrally formed on the upper and lower ends of the abdomen and the abdomen, respectively, and in the pressing step, an upper pressurizing member in contact with the upper surface of the lower flange of the main beam; And a pressurizing means comprising a lower pressurizing member in contact with a lower surface of the upper flange of the prestressing beam, a pressurizing bolt penetrating the upper and lower pressurizing members up and down, and a pressurizing nut fastened to the upper and lower ends of the pressing bolt. .

In addition, the present invention, in order to achieve the above object, a plurality of installed temporary vents in the longitudinal direction and the width direction of the bridge; Prestressing beams are respectively fixed and installed on the upper left and right sides of the respective temporary vents; A point pad installed on one end or both ends of the prestressing beam; A main beam seated on an upper portion of the point pad such that the point pad is located inward from both ends thereof; It is provided between the both ends of the main beam and the prestressing beam to provide a temporary bridge using a prestressed forced beam is configured to include a pressing means for pressing down both ends of the main beam.

The main beam and the prestressing beam are each formed of a section steel having an upper and a lower flange integrally formed at the upper and lower ends of the abdomen and the abdomen, and the pressing means includes an upper pressing member in contact with an upper surface of the lower flange of the main beam; And a lower pressurizing member contacting a lower surface of the upper flange of the prestressing beam, a pressurizing bolt penetrating the upper and lower pressurizing members up and down, and a pressurizing nut fastened to both ends of the pressurizing bolt.

The upper and lower pressurizing members are formed of a shape steel having an upper abdomen and upper and lower flanges integrally formed on the upper and lower ends of the abdomen, and the upper pressurizing member bracing is welded between the upper and lower flanges of the upper pressurizing member. The lower pressing material bracing is welded and fixed between the upper and lower flanges of the lower pressing material.

The upper pressurizing member bracing is welded and fixed to the upper flange of the upper pressurizing member and the lower surface of the upper flange of the main beam and the abdomen of the main beam.

The upper press member cuts a part of the lower flange so that the lower end of the abdomen is directly welded to the upper surface of the lower flange of the main beam, and the lower press member cuts a part of the upper flange so that the upper end of the abdomen is the main beam. It is directly welded to the lower surface of the upper flange of the.

The lower pressurizing members are connected to each other in the width direction of the bridge by lower pressurizing member connecting bracing.

A rubber support is inserted between the lower surface of the main beam and the upper surface of the prestressing beam at the installation position of the pressing means.

Prestressed steel beams and a method for manufacturing the same, and a temporary bridge using the same according to the present invention are a pair of main beams and a pair of fixed and arranged so that inner ends thereof are positioned inside both ends of the main beams at both lower ends of the main beams. A pair of point pads inserted between the prestressing beam and the main beam and the prestressing beam at positions spaced from both ends of the main beam toward the middle; It is provided with a pressing means for pressing both ends of the main beam downward toward the prestressing beam, it is possible to introduce the prestress before the main beam is completely fixed to minimize the prestress loss, which is a problem in the conventional tension tension method.

Prestressed steel beams and a method of manufacturing the same and prefabricated bridges using the same according to the present invention include an upper structure including a main beam at a point pad portion installed at a position spaced from the both ends of the main beam to the middle side, and a prestressing beam and a temporary vent Since the substructure is separated, the horizontal force transmitted to the substructure by the expansion and contraction of the temperature can be minimized to greatly reduce the amount of steel in the substructure.

The steel beam and prefabricated bridge using the prestress according to the present invention, and the construction bridge using the same, is to introduce the prestress by the pressing means composed of the upper, lower pressing material, the pressing bolt and the pressing nut, compared to the conventional steel plate mounting method The fabrication of prestressed steel beams is quick and simple, eliminating the need for specific equipment and reducing the cost of using specific equipment.

The prestressed beam and the manufacturing method thereof using the prestress according to the present invention are constructed using the prestressing beam and pressurizing means made of members which are much smaller than the steel sheet used in the conventional steel plate attachment method. Problems can be ruled out.

1 to 6 show a preferred embodiment of the prestress is introduced prestress according to the present invention,
1 is a perspective view of a steel beam introduced prestress according to the present invention,
2 is an enlarged view of a portion “A” of FIG. 1;
3 is an exploded perspective view of the pressing means,
4 is an enlarged view of a portion “B” of FIG. 1;
5 is a front view of a steel beam in which prestress is introduced according to the present invention;
6 is an enlarged view of “C” portion of FIG. 5;
7 is a process chart showing a method of manufacturing a prestressed steel beams according to the present invention,
8 to 11 illustrate a first preferred embodiment of a temporary bridge using a steel beam in which prestress is introduced according to the present invention.
8 is a perspective view of a temporary bridge using a steel beam introduced prestress according to the present invention,
9 is an exploded perspective view of a temporary bridge using a steel beam in which prestress is introduced according to the present invention;
10 is a front view of a temporary bridge using a forced beam introduced prestress according to the present invention,
11 is a right side view of a temporary bridge using a steel beam in which prestress is introduced according to the present invention.

Hereinafter, with reference to the accompanying drawings, a preferred embodiment of a prestressed steel beam and a method of manufacturing the same and a temporary bridge using the same according to the present invention will be described in detail.

1 to 6 show a first preferred embodiment of a steel beam in which prestress is introduced according to the present invention.

1 to 6, "B" shows a forced beam in which prestress is introduced according to the present embodiment.

The forced beam SB into which the prestress is introduced according to the present embodiment includes a main beam 10 as shown in FIG. 1; A pair of prestressing beams 20 fixed and disposed at both lower ends of the main beams 10; A point pad 30 inserted between a lower surface of both ends of the main beam 10 and an upper surface of the prestressing beam 20; And pressing means for pressing both ends of the main beam 10 downwardly toward the prestressing beam 20.

As shown in FIG. 2, the main beam 10 is formed of an abdomen 11 and an upper and lower flanges 12 and 13 integrally formed on the upper and lower ends of the abdomen 11. do. H-beams or I-beams may be used as the section steel used in the main beam 10.

The main beam 10 preferably reinforces by welding a plurality of main beam bracing 14 between both sides of the abdomen 11 and the upper and lower flanges 12 and 13.

The main beam 10 may be composed of one member corresponding to the required span length, but as shown in FIGS. 1 and 4, the main beam 10 is composed of the plurality of members (two in the illustrated example), The bolts / nuts 17 and 18 may be fastened by connecting connecting steel plates 15 and 16 to the upper and lower surfaces of both sides of the abdomen 11 constituting the two members and the upper and lower surfaces of the lower flange 13.

The prestressing beam 20 is formed of an abdomen 21, and an upper and lower flanges 22 and 23 integrally formed on the upper and lower ends of the abdomen 21. As the steel used for the prestressing beam 20, H-shaped steel or I-shaped steel may be used.

Preferably, the prestressing beam 20 welds and reinforces a plurality of prestressing beam bracings 24 between both sides of the abdomen 11 and the upper and lower flanges 22 and 23.

As shown in FIGS. 1 and 2, 5 and 6, the point pad 30 is a member that becomes a point when the prestress is introduced into the main beam 10. The structure composed of and is used.

As shown in FIGS. 1 to 3, 5 and 6, the pressurizing means includes an upper pressurizing material 40 in contact with an upper surface of the lower flange 13 of the main beam 10, and the prestressing beam 20. A lower pressurizing member 50 in contact with a lower surface of the upper flange 22, a pressurizing bolt 60 penetrating the upper and lower pressurizing members 40 and 50 up and down, and an upper and lower pressurizing bolt 60. It is configured to include a pressure nut 70 is fastened to the bottom.

The upper press member 40 is composed of a pair disposed on both left and right sides of the lower flange 13 of the main beam 10, the lower press member 50 is the upper flange of the prestressing beam 20 ( It is composed of a pair disposed on both left and right sides of 22).

The upper and lower pressurizers 40 and 50 may use block-shaped steel, but as illustrated, the upper and lower portions of the abdomen 41 and 51 and the upper and lower portions of the abdomen 41 and 51 may be integrated. It is preferable to use a shaped steel composed of upper and lower flanges 42, 43, 52, 53 (see Figs. 2 and 3).

The upper pressing member bracing 44 is welded and fixed between the upper and lower flanges 42 and 43 of the upper pressing member 40, and the upper and lower flanges 52 and 53 of the lower pressing member 50. The lower pressurizing material bracing 54 is welded and fixed therebetween.

The upper pressurizing material bracing 45 is welded to the upper flange 42 of the upper pressurizing material 40, the lower surface of the upper flange 12 of the main beam 10, and the abdomen 11 of the main beam 10. It is preferable.

The upper pressurizing material 40 may allow the lower surface of the lower flange 43 to be welded to the upper surface of the lower flange 13 of the main beam 10. It is preferable to cut a part so that the lower end of the abdomen 41 is directly welded to the upper surface of the lower flange 13 of the main beam 10, and the lower press member 50 is formed of the upper flange 52 The upper surface may be welded to the lower surface of the upper flange 12 of the main beam 10, but a part of the upper flange 52 is cut off so that the upper end of the abdomen 51 is the upper portion of the main beam 10. Preferably, the flange 52 is directly welded to the lower surface of the flange 52.

A rubber support 80 is inserted between both ends of the lower flange 13 of the main beam 10 and both ends of the upper flange 22 of the prestressing beam 20. The rubber support 80 is compressed when both ends of the main beam 10 is pressed downward by the pressing means, and the lower flange 13 of the main beam 10 and the upper flange 22 of the prestressing beam 20. The upper surface is to be kept in close contact via the rubber base (80).

Hereinafter, the manufacturing method of the steel beam into which prestress by this invention was introduce | transduced is demonstrated.

According to the method of manufacturing a prestressed steel beam in which the prestress is introduced according to the present invention, as shown in FIG. step; As shown in Figure 7 (b), the step of installing the point pad 30 on the upper surface of one end of the pair of prestressing beam (20); As shown in FIG. 7C, placing the main beam 10 on the point pad 30 such that the point pad 30 is positioned inward of both ends of the main beam 10; As shown in Figure 7 (d), the step of installing the pressing means between the main beam 10 and the prestressing beam 20 at both ends of the main beam (10); As shown in (e) of FIG. 7, pressing down both ends of the main beam 10 toward the prestressing beam 20 by using the point pad 30 as the point by the pressing means. Include.

The main beam 10, a pair of pre-stressing beam 20, the point pad 30, the upper and lower pressing members 40, 50, the pressing bolt 60 and the pressing nut constituting the pressing means ( 70) is the same as in the embodiment of the above-described prestressed steel beams, the same reference numerals are assigned to the same parts, and detailed description thereof will be omitted.

In the step of installing the pair of prestressing beams 20, the inner ends of the pair of prestressing beams 20 are installed so as to be positioned inside both ends of the prestressing target main beams 10.

Preferably, the length of the pair of prestressed beams 20 is 1/20 to 1/10 of the length of the main beams 10, but the object to which the prestressed steel is installed according to the present invention is installed. Can be set according to the specifications of the hypothesis vent.

In the step of installing the point pad 30, the point pad 30 is installed on the inner end of the prestressing beam 20. As shown in the example, when the prestressing beam 20 is formed of H-shaped steel having an abdomen 21 and an upper and lower flanges 22 and 23, the point pad 30 constitutes the prestressing beam 20. It is installed on the upper flange 22.

In the step of placing the main beam 10, the point pad 30 is located inward from both ends of the main beam (10). As shown in the example, when the main beam 10 is composed of an H-shape having an abdomen 11 and an upper and lower flanges 12 and 13, both ends of the lower flanges 13 of the main beam 10 are lower surfaces. The top surface of the point pad 30 comes into contact with the top surface.

In the step of installing the pressurizing means, an upper pressurizing member 40 is installed on the main beam 10, a lower pressurizing member 50 is installed on the prestressing beam 20, and the upper and lower pressurizing members 40 are installed. Penetration through the pressure bolt (60) up and down on the 50, fastening the pressure nut (70) on the upper and lower ends of the pressure bolt (60).

When the main beam 10 and the prestressing beam 20 are composed of H-shaped steel having the abdomen 11, 21 and the upper and lower flanges 12, 13, 22, 23, respectively, the upper pressing material 40 is installed on the upper surface of the lower flange 13 of the main beam 10, the lower pressing material 50 is installed on the upper surface of the upper flange 22 of the prestressing beam 20.

As shown in the example, the upper and lower pressurizing members 40 and 50 are formed on the upper and lower ends of the abdomen 41 and 51 and the upper and lower ends of the abdomen 41 and 51. When using the H-shaped steel consisting of 43, 52, 53, the upper pressurizing material bracing 44 is welded between the upper and lower flanges 42 and 43 of the upper pressurizing material 40, It is preferable to fix and weld and fix the lower pressurizing material bracing 54 between the upper and lower flanges 52 and 53 of the lower pressurizing material 50.

The upper pressing member bracing 45 is welded to the upper flange 42 of the upper pressing member 40, the lower surface of the upper flange 12 of the main beam 10, and the abdomen 11 of the main beam 10. Preferably, the upper pressurizing material 40 is integrally coupled to both ends of the main beam 10.

The upper pressurizing material 40 may allow the lower surface of the lower flange 43 to be welded to the upper surface of the lower flange 13 of the main beam 10. It is preferable to cut a part so that the lower end of the abdomen 41 is directly welded to the upper surface of the lower flange 13 of the main beam 10, and the lower press member 50 is formed of the upper flange 52 The upper surface may be welded to the lower surface of the upper flange 12 of the main beam 10, but a part of the upper flange 52 is cut off so that the upper end of the abdomen 51 is the upper portion of the main beam 10. Preferably, the flange 52 is directly welded to the lower surface of the flange 52.

In the step of installing the pressing means, a rubber support 80 is inserted between both ends of the lower flange 13 of the main beam 10 and both ends of the upper flange 22 of the prestressing beam 20.

The rubber support 80 is compressed when both ends of the main beam 10 is pressed downward by the pressing means, and the lower flange 13 of the main beam 10 and the upper flange 22 of the prestressing beam 20. The upper surface is to be kept in close contact via the rubber base (80).

In the step of pressing down both ends of the main beam 10 by the pressing means, the main beam 10 by tightening the pressing nut 70 fastened to the upper and lower ends of the pressing bolt 60 constituting the pressing means. Press both ends of down).

The pressing force for prestressing the main beam 10 is generated by the tightening force of the nut 70 against the bolt 60.

When both ends of the main beam 10 is pressed downward by the pressing means, a moment of M = Pe is generated between the point pads 30 installed in the main beam 10 at a position spaced from both ends toward the middle portion thereof. As a result, an upward spring force is generated in the middle portion thereof, thereby prestressing the main beam 10.

In the step of pressing down both ends of the main beam 10 by the pressing means, rubber inserted between both ends of the lower flange 13 of the main beam 10 and both ends of the upper flange 22 of the prestressing beam 20. As the support 80 is compressed, the lower surface of the lower flange 13 of the main beam 10 and the upper surface of the upper flange 22 of the prestressing beam 20 are maintained in close contact with each other via the rubber support 80.

Hereinafter, a preferred embodiment of a temporary bridge using a steel beam in which prestress is introduced according to the present invention will be described.

A temporary bridge using a steel beam in which prestress is introduced according to the present invention includes a plurality of temporary vents (TB) disposed at regular intervals in a longitudinal direction of the bridge; It includes a forced beam (SB) is introduced pre-stress is installed on the upper end of the temporary vent (TB).

The plurality of temporary vents TB are provided in plural in the width direction of the bridge.

The plurality of temporary vents TB include a plurality of vertical beams 91, horizontal beams 92, and the like, and a plurality of vent bracings 93 are coupled to each other for reinforcement.

H-beams are used as the vertical beams 91, channel-beams are used as the horizontal beams 92, and angle-beams are used as the vent bracing 93s.

The prestressed forced beam SB is used as the prestressed reinforced beam described with reference to FIGS. 1 to 6.

The prestressed steel beam SB is the same as the prestressed steel beam described with reference to FIGS. 1 to 6, and the process of introducing the prestress is performed by manufacturing the prestressed steel beam described with reference to FIG. 7. The same parts as in the method will be denoted by the same reference numerals and detailed description thereof will be omitted.

The pre-stressed steel beam (SB) may be prefabricated at the factory and assembled on the temporary vent (TB) in the factory, but it is preferable to introduce the prestress while assembling in the field in consideration of transportation problems.

That is, after the construction of the temporary vent (TB), the prestressing beam 20 is installed on the upper end of the temporary vent (TB), the point pad 30 is placed on the prestressing beam 20, and then the point pad 30 It is preferable to put the main beam 10 on the top, and to install a pressing means between the main beam 10 and the prestressing beam 20 to introduce the prestress into the main beam 10 by the pressing means.

The lower pressurizing member 50 is connected to each other disposed in the width direction of the bridge by the lower pressurizing material connecting bracing 55 so that the prestressing beam 20 and the lower pressurizing member 50 are firmly fixed and coupled. It is preferable.

In the drawing, reference numeral 101 denotes a perforated plate, and 102 denotes a handrail.

On the other hand, the end of the steel beam (SB) in which different prestresses are introduced is supported on the upper end of the temporary vent (TB) installed in the middle portion except for both ends of the bridge, in this case, installed on the upper end of the temporary vent (TB) The length of the prestressing beam 20 is formed to be equal to twice the length of the prestressing beam 20 installed at the upper end of both ends of the bridge construction tent (TB) of the bridge, the supporting pad 30 and the pressing means at both ends Install each one.

In the above, the present invention has been described with reference to the illustrated drawings as a preferred embodiment, but the present invention is not limited by the embodiments and drawings presented in the present specification, the present invention within the scope of the technical idea of the present invention. Of course, various modifications can be made.

10: main beam 20: prestressing beam
30: support pad 40: upper pressurizing material
50: lower pressurizing material 60: pressurizing bolt
70: pressurized nut 80: rubber bearing
SB: Forced beam TB: Temporary vent

Claims (15)

A main beam 10;
A pair of prestressing beams 20 fixed and disposed at lower ends of both ends of the main beam 10 such that inner ends thereof are positioned inward from both ends of the main beam 10;
A pair of point pads (30) inserted between the main beam (10) and the prestressing beam (20) at positions spaced from the opposite ends of the main beam (10) to an intermediate side;
A pressurizing means installed between the main beam 10 and the prestressing beam 20 at both ends of the main beam 10 to press both ends of the main beam 10 toward the prestressing beam 20. Forced beam with prestress.
The method of claim 1,
The main beam 10 and the prestressing beam 20 are upper and lower flanges 12 and 13 integrally formed on the upper and lower ends of the abdomen 11, 21 and the abdomen 11, 21, respectively. 22) consists of a section steel having 23,
The pressurizing means includes an upper pressurizing member 40 in contact with the upper surface of the lower flange 13 of the main beam 10 and a lower pressurizing member 50 in contact with the lower surface of the upper flange 22 of the prestressing beam 20. And a press bolt 60 penetrating the upper and lower pressurizers 40 and 50 up and down, and a press nut 70 fastened to both ends of the press bolt 60. Forced beams introduced.
The method of claim 2,
The upper and lower pressurizing material 40, 50,
Each of the abdomen 41 and 51 and the upper and lower flanges 42, 43, 52 and 53 formed integrally on the upper and lower ends of the abdomen 41 and 51, respectively,
The upper pressing member bracing 44 is welded and fixed between the upper and lower flanges 42 and 43 of the upper pressing member 40, and the upper and lower flanges 52 and 53 of the lower pressing member 50. Pre-stressed steel beams, characterized in that the lower pressurizing material bracing (54) is welded and fixed between.
The method of claim 3, wherein
Upper pressurizing material bracing 45 welded and fixed to the upper flange 42 of the upper pressurizing member 40 and the lower surface of the upper flange 12 of the main beam 10 and the abdomen 11 of the main beam 10. The prestress is introduced, characterized in that further comprises a).
The method of claim 3, wherein
The upper press member 40 cuts a part of the lower flange 43 so that the lower end of the abdomen 41 is directly welded to the upper surface of the lower flange 13 of the main beam 10,
The lower pressurizing member 50 cuts a part of the upper flange 52 so that the upper end of the abdomen 51 is directly welded to the lower surface of the upper flange 52 of the main beam 10. Forced beams introduced.
The method of claim 2,
The prestressed steel beam is introduced, characterized in that the rubber support 80 is inserted between the lower surface of the main beam 10 and the upper surface of the prestressing beam 20 at the installation position of the pressing means.
Arranging the pair of prestressing beams 20 so that their inner ends correspond inwardly to both ends of the prestressing main beam 10;
Installing point pads (30) on one or both ends of the pair of prestressing beams (20);
Placing the main beam 10 on the point pad 30 such that the point pad 30 is positioned inward of both ends of the main beam 10;
Installing pressing means between both ends of the main beam (10) and the point pad (30);
And pressing down both ends of the main beam (10) toward the prestressing beam (20) with the point pad (30) as a point.
The method of claim 7, wherein
The main beam 10 and the prestressing beam 20 are upper and lower flanges 12 and 13 integrally formed on the upper and lower ends of the abdomen 11, 21 and the abdomen 11, 21, respectively. 22) (23), which uses the steel
In the pressing step, the upper pressurizing material 40 in contact with the upper surface of the lower flange 13 of the main beam 10 and the lower pressurizing material 50 in contact with the lower surface of the upper flange 22 of the prestressing beam 20. And a pressurizing means composed of a pressurizing bolt 60 penetrating the upper and lower pressurizing members 40 and 50 up and down and a pressurizing nut 70 fastened to the upper and lower ends of the pressing bolt 60. A method for producing a steel beam in which prestress is introduced.
A plurality of temporary vents (TB) installed in a longitudinal direction and a width direction of the bridge;
A prestressing beam 20 fixed and installed at both upper and left sides of each temporary vent TB;
A point pad 30 installed on one end or both ends of the prestressing beam 20;
A main beam 10 seated on an upper portion of the point pad 30 so that the point pad 30 is located inward from both ends thereof;
A hypothetical bridge using prestressing introduced prestressing is provided between the both ends of the main beam (10) and the prestressing beam (20) comprising a pressing means for pressing down both ends of the main beam (10).
The method of claim 9,
The main beam 10 and the prestressing beam 20 are upper and lower flanges 12 and 13 integrally formed on the upper and lower ends of the abdomen 11, 21 and the abdomen 11, 21, respectively. 22) consists of a section steel having 23,
The pressurizing means includes an upper pressurizing material 40 in contact with an upper surface of the lower flange 13 of the main beam 10 and a lower pressurizing material 40 in contact with a lower surface of the upper flange 22 of the prestressing beam 20. And a press bolt 60 penetrating the upper and lower pressurizers 40 and 50 up and down, and a press nut 70 fastened to both ends of the press bolt 60. Temporary bridge using introduced steel beams.
The method of claim 10,
The upper and lower pressurizing material 40, 50,
Each of the abdomen 41 and 51 and the upper and lower flanges 42, 43, 52 and 53 formed integrally on the upper and lower ends of the abdomen 41 and 51, respectively,
The upper pressing member bracing 44 is welded and fixed between the upper and lower flanges 42 and 43 of the upper pressing member 40, and the upper and lower flanges 52 and 53 of the lower pressing member 50. Hypothesis bridge using a prestressed steel beam, characterized in that the lower pressing material bracing 54 is welded, fixed between).
The method of claim 11,
Upper pressurizing material bracing 45 welded and fixed to the upper flange 42 of the upper pressurizing member 40 and the lower surface of the upper flange 12 of the main beam 10 and the abdomen 11 of the main beam 10. A temporary bridge using a prestressed steel beam, characterized in that it further comprises a).
The method of claim 11,
The upper press member 40 cuts a part of the lower flange 43 so that the lower end of the abdomen 41 is directly welded to the upper surface of the lower flange 13 of the main beam 10,
The lower pressurizing member 50 cuts a part of the upper flange 52 so that the upper end of the abdomen 51 is directly welded to the lower surface of the upper flange 52 of the main beam 10. Temporary bridge using introduced steel beams.
The method of claim 10,
The lower pressurizing member 50 is a temporary bridge using a prestressed steel beam, characterized in that the one arranged in the width direction of the bridge is connected by the lower pressurizing material connecting bracing (55).
The method of claim 10,
A temporary bridge using prestressed steel beams, characterized in that a rubber bearing is inserted between the lower surface of the main beam 10 and the upper surface of the prestressing beam 20 at the installation position of the pressing means.

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