JP2011157733A - Method of constructing composite steel floor slab bridge, steel floor slab with rib, and composite steel floor slab bridge - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve problems of a conventional composite steel floor slab wherein, despite the fact that the height of a girder is reduced by using vertical ribs for both dowel and main girder functions, the installation of horizontal ribs on the lower surface of the steel floor slab invades a space under the bridge, and the horizontal ribs take labor for painting after the start of use of the bridge in addition to a labor for installation, which is one of the reasons of an increase in maintenance cost. <P>SOLUTION: In this steel floor slab with ribs which constitutes a composite steel floor slab, a plurality of vertical ribs disposed in parallel or generally in parallel are fixed to one surface of a steel plate, a plurality of horizontal ribs disposed perpendicular or generally perpendicular to the vertical ribs are fixed to the surface of the steel plate to which the vertical ribs are fixed, and the vertical ribs and the horizontal ribs are disposed on and fixed to one surface of the steel plate in a lattice shape. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a reinforced concrete synthetic steel slab having a steel slab (hereinafter simply referred to as “synthetic steel slab”), and specifically, a synthetic steel slab using a synthetic slab as a synthetic slab. The present invention relates to a bridge construction method, a steel deck with ribs, and a synthetic steel deck.

  A synthetic steel slab is a composite structure in which reinforced concrete is constructed on a steel slab made of a steel plate or the like. This steel floor slab becomes a member that resists as a part of the main girder and floor slab when completed, and is a very rational member used as a form of reinforced concrete during construction. Since the steel slab is also used as a formwork, the work of constructing the formwork is omitted, and the construction period of the bridge using the floor slab as a synthetic steel slab (hereinafter referred to as “synthetic steel slab bridge”) is shortened. It is known as a possible bridge type. Synthetic steel deck bridges are also characterized by low noise and vibration due to vehicle traffic.

  Synthetic steel slabs have a structure in which reinforced concrete and steel slabs are integrated to resist loads, and in order to increase adhesion to concrete, the steel slab is often provided with a diver. Various types of gibber are used, such as a stud diver that is a rod-like protrusion, a truss-type diver that is a truss-shaped protrusion, or a rib that is a plate-like protrusion. Yes.

  The synthetic steel deck can also function as a main girder action by being coupled to the main girder. The main girder action here refers to an action that resists forces acting on the main girder (such as bending moment in the bridge axis direction). If a synthetic steel deck is connected to the main girder, the cross-sectional force of the floor slab As well as the main girder effect.

  On the other hand, in recent years, there are an increasing number of bridges where the space under the bridge is restricted, such as bridges over urban rivers, overpasses over roads, and overpasses over railway tracks. For this reason, or for landscape reasons, there is an increasing demand for reducing the digit height, and techniques for reducing the digit height have also been proposed. The applicant of the present application has also proposed Patent Document 1 as a technique for reducing the bridge girder height.

JP 2004-270270 A

  Patent Document 1 is a synthetic steel deck slab bridge using a steel deck slab composed of a bottom steel plate and vertical ribs. By providing a plurality of through holes in the vertical ribs, adhesion with concrete is enhanced, and the vertical ribs are used as main girder. By arranging and fixing in the direction, buckling of the bottom steel plate is prevented, and the bottom steel plate and the vertical rib contribute to the main girder action. That is, the vertical rib fixed to the bottom steel plate is a member having both a gibber and a main girder function. By sharing the main girder action between the bottom steel plate and the vertical ribs, it is possible to reduce the size of the synthetic steel deck and the main girder, and as a result, the girder height can be reduced.

  When the main girder action is shared by the steel slab composed of the bottom steel plate and the longitudinal rib, bending compression or axial compression in the bridge axis direction (main girder direction) acts on this steel slab, which may cause buckling. . Therefore, the transverse rib is usually fixed to the bottom steel plate as a stiffener to prevent buckling of the steel deck.

  FIG. 5 is a perspective view showing a conventional synthetic steel slab, in which a plurality of vertical ribs A arranged in parallel with the bridge axis direction are fixed on the bottom steel plate B. FIG. Each vertical rib A may be provided with a number of through holes for adhesion to floor slab concrete. As shown in FIGS. 5 and 6, a lateral rib C arranged in a direction perpendicular to the bridge axis is fixed between the main beam and the lower surface of the bottom steel plate B. Moreover, as shown in FIG. 6, the horizontal rib C is attached to the bottom steel plate B and fixed to the main girder, and is generally arranged at intervals of 2 to 3 m in the bridge axis direction.

  Thus, since the conventional horizontal rib C is fixed to the main girder on the bottom surface of the bottom steel plate, it supports its own weight until the floor slab concrete is hardened, and in addition to the sectional force generated by the live load after the bridge is used. It was designed and installed as something that could compete. In particular, in order to bear a shearing force due to a live load (ring load, etc.) after service, a member having a relatively large cross-sectional resistance, such as an inverted T-shaped cross section in which a conventional lateral rib C has a web attached to a lower flange. It was said.

  In order to reduce the cross-section of the member of the horizontal rib C, the horizontal rib C is not fixed to the main girder and contributes to the shearing force so that the concrete weight until hardening and the live load after use are not borne by the horizontal rib C. It is also possible to adopt a structure that does not (FIG. 7). However, in this case, even if the girder height is reduced due to the restriction of the space under the bridge or the demand on the landscape, the lateral rib C is provided on the lower surface of the steel deck, so that the space under the bridge is invaded and the landscape is damaged. Further, if the horizontal rib C is installed on the lower surface of the steel slab, it takes time to install the horizontal rib C, and the labor of painting the horizontal rib C after the start of service is also generated, which increases the maintenance cost.

  The object of the present invention is to solve the above-mentioned problems by reducing the girder height and reducing the cross section of the lateral rib member, and constructing a synthetic steel deck slab bridge in which no lateral rib is provided on the lower surface of the steel deck. It is an object of the present invention to provide a ribbed steel slab that enables such a synthetic steel slab bridge and a synthetic steel slab bridge.

  The construction method of the synthetic steel floor slab bridge of the present invention is a parallel or substantially parallel construction method of a synthetic steel floor slab bridge comprising a main girder and a synthetic steel floor slab having a steel deck and floor slab concrete. A ribbed steel slab in which a plurality of arranged vertical ribs and a plurality of horizontal ribs arranged orthogonally or substantially orthogonally to the vertical ribs are fixed to the same surface of the bottom steel plate is joined to the main girder. A construction method comprising a ribbed steel slab installation step, a reinforcing bar placement step on the ribbed steel slab, and a concrete placement step in which concrete is placed on the ribbed steel slab. Is a method of forming a synthetic steel deck.

  In the ribbed steel slab of the present invention, in the ribbed steel slab constituting a synthetic steel slab, a plurality of vertical ribs arranged in parallel or substantially in parallel are fixed to one surface of the bottom steel plate, A plurality of horizontal ribs arranged orthogonally or substantially orthogonally to the vertical ribs are fixed to a surface of the steel plate to which the vertical ribs are fixed, and the vertical ribs and the horizontal ribs are arranged in a lattice shape on the bottom steel plate. It is fixed.

  In this case, each vertical rib may be provided with a plurality of through holes, or the lateral rib may be a plate rib using a plate material.

  The synthetic steel floor slab bridge of the present invention is a synthetic steel floor slab bridge comprising a main girder, and a synthetic steel floor slab having a steel slab and floor slab concrete. 4. A steel floor slab with ribs according to any one of 4 above.

The synthetic steel floor slab bridge construction method of the present invention has the following effects.
(1) Since the production of the steel slab including the fixing of the lateral ribs can also be performed at the factory, it is possible to omit the lateral rib fixing work at the site, and the construction period at the site can be shortened.
(2) Omitting the work of attaching the horizontal rib under the bridge surface at the site will not only reduce the construction effort, but also improve the safety for third parties traveling around the bridge.

The ribbed steel slab and the synthetic steel slab bridge of the present invention have the following effects.
(1) Since the bottom steel plate and the vertical rib share the main girder action, the size of the main girder can be reduced and the girder height can be reduced.
(2) Since the horizontal ribs are provided on the upper surface of the steel deck, it is possible to further reduce the girder height and to effectively utilize the space under the bridge.
(3) Since it is not necessary for the horizontal rib to bear the live load after use, the member cross section of the horizontal rib can be reduced.
(4) The lateral ribs are not exposed under the bridge surface and are excellent in landscape.
(5) Maintenance costs such as painting do not occur as a result of the horizontal ribs being buried in the floor slab.

The whole figure which shows the bridge of this invention. The perspective view which notched some synthetic steel slabs of this invention. Sectional drawing of the bridge axis perpendicular direction which shows the connection body of the steel deck of this invention and a main girder. (A) is a result of linear buckling analysis for a synthetic steel slab without a lateral rib, and (b) is a result of linear buckling analysis for a synthetic steel slab of the present invention with a lateral rib. The perspective view which notched a part of the conventional synthetic steel slab. Sectional drawing of the bridge-axis perpendicular direction which shows the connection body of the conventional steel deck and a main girder. Sectional drawing of a bridge axis perpendicular direction which shows the case where it is set as the structure which does not fix the conventional horizontal rib to a main girder.

(Embodiment)
One embodiment of the synthetic steel floor slab bridge construction method, the ribbed steel floor slab, and the synthetic steel floor slab bridge of the present invention will be described with reference to the drawings.
FIG. 1 is an overall view showing a girder-type bridge 1 straddling a river. As shown in this figure, the bridge 1 includes an abutment 2 installed on both sides of the river, and a bridge girder 3 passed between the abutment 2 and the abutment 2, and the bridge girder 3 is paved. It is used as a road bridge.

  With reference to FIG. 2, each member which comprises the bridge 1 is demonstrated. The bridge girder 3 supported on the abutment 2 is composed of a main girder 4 and a synthetic steel slab 5, and this synthetic steel slab 5 is composed of a steel slab 6 and floor slab concrete 7. Furthermore, the steel slab 6 includes a bottom steel plate 8, vertical ribs 9, and horizontal ribs 10, and the floor slab concrete 7 includes concrete 11 and reinforcing bars 12. The reinforcing bar 12 is a combination of the main reinforcing bars 12a arranged in the direction perpendicular to the bridge axis and the distribution bars 12b arranged in the bridge axis direction. Asphalt pavement 13 is provided on the upper surface of the synthetic steel slab 5, and ground covers 14 are provided at both ends of the synthetic steel slab 5 in the direction perpendicular to the bridge axis. A protective fence 15 is provided on the ground cover 14. ing. As described above, the bridge 1 includes the abutment 2, the bridge girder 3, the asphalt pavement 13, the ground cover 14, and the protective fence 15. The bridge 1 of this embodiment is a simple girder girder type, but this is only an example, and in the case of a continuous girder bridge with an abutment 2 and piers, other bridge types such as truss bridges and suspension bridges. However, as long as the synthetic steel deck 5 using the steel deck 6 of the present invention is provided, it is the bridge 1 of the present invention. In addition, when a horizontal girder is provided on the lower surface of the synthetic steel slab 5, the main girder has a different shape such as a box girder, or a bridge other than a road bridge not provided with the asphalt pavement 13, the ground cover 14 and the protective fence 15 Even so, as long as the synthetic steel deck 5 using the steel deck 6 of the present invention is provided, it is included in the bridge 1 of the present invention.

(Steel floor slab)
The steel slab 6 is obtained by fixing vertical ribs 9 and horizontal ribs 10 on a bottom steel plate 8 by welding. In addition, as long as the vertical rib 9 and the horizontal rib 10 are fixed on the bottom steel plate 8, not only welding but another conventional technique may be used. The bottom steel plate 8 is a thin plate material, and the vertical rib 9 and the horizontal rib 10 are long thin plate materials. For example, the bottom steel plate 8 has a thickness of 9 mm, and the vertical rib has a width of 140 mm × plate thickness. 14 mm and the dimensions of the lateral rib 10 can be 120 mm width × 9 mm plate thickness. Of course, these dimensions are examples, and the dimensions and standards of each member are designed by calculation under various given conditions such as design load and span length.

  A plurality of the vertical ribs 9 are arranged in a substantially parallel (including parallel) manner and fixed by welding in a posture in which the plate width direction is substantially perpendicular (including vertical) to the bottom steel plate 8. When the steel deck 6 is joined to the main girder 4, the steel deck 6 is arranged so that the direction in which the longitudinal ribs 9 are arranged (longitudinal direction of the longitudinal ribs 9) substantially coincides with the main girder 4 direction, that is, the bridge axis direction. Is placed. As an example of the arrangement of the vertical ribs 9, the arrangement interval can be set to 375 mm. Of course, this distance dimension is also set appropriately by design calculation, and is not limited to this dimension.

  As shown in FIG. 2, the vertical ribs 9 can be provided with a plurality of through holes 9 a at intervals in the longitudinal direction of the plate material. By providing this through-hole 9a, the adhesive force between the floor slab concrete 7 and the vertical ribs 9 increases, so that the steel floor slab 6 and the floor slab concrete 7 can function as a more integrated structure. The through hole 9a shown in FIG. 2 has a circular shape, but is not limited to a circular shape and may have any other shape.

  The horizontal rib 10 is fixed to the surface to which the vertical rib 9 of the bottom steel plate 8 is fixed. In other words, although the vertical rib 9 and the horizontal rib 10 are fixed to one surface of the bottom steel plate 8, neither the vertical rib 9 nor the horizontal rib 10 is fixed to the other surface of the bottom steel plate 8. Similar to the longitudinal ribs 9, a plurality of the transverse ribs 10 are arranged in a substantially parallel (including parallel) manner and fixed by welding in a posture in which the plate width direction is substantially perpendicular (including perpendicular) to the bottom steel plate 8. The direction in which the horizontal ribs 10 are arranged is substantially perpendicular (including vertical) to the vertical ribs 9, that is, the vertical ribs 9 and the horizontal ribs 10 are arranged and fixed in a lattice pattern on the same surface of the bottom steel plate 8. It becomes. As an example of arrangement | positioning of the horizontal rib 10, the arrangement space | interval can be 2-3 m. Of course, this distance dimension is also set appropriately by design calculation, and is not limited to this dimension. Further, it is desirable that the length (dimension in the longitudinal direction) of the lateral rib 10 is such that both end portions of the lateral rib 10 are placed on the main beam 4 when the bottom steel plate 8 is disposed on the main beam 4. As a result, the transverse rib 10 together with the bottom steel plate 8 can resist the bending moment and shearing force due to its own weight until the floor slab concrete 7 is hardened.

  As for the intersecting portions of the vertical ribs 9 and the horizontal ribs 10 arranged in a lattice pattern, the horizontal ribs 10 are slightly shorter than the vertical ribs 9 (for example, 375 mm), and the ends of the horizontal ribs 10 are butted against the vertical ribs 9. Or a notch portion (having substantially the same width as the plate thickness of the horizontal rib 10) is provided in the vertical rib 9 in accordance with the arrangement interval (for example, 2 m) of the horizontal rib 10, and the notch portion is formed into the horizontal rib 10 For example, the vertical ribs 9 and the horizontal ribs 10 are provided with notches at the intersections of the vertical ribs 9 and the horizontal ribs 10, and the notches are combined. Various means can be used. In addition, as for the vertical rib 9 and the horizontal rib 10 in an intersection part, it is desirable to fix each other by welding.

  The steel slab 6 can be welded to the bottom steel plate 8 with the longitudinal ribs 9 and the transverse ribs 10 on site according to the situation at the site. Usually, the steel slab 6 is manufactured in a factory, and the steel floor slab 6 as a product is transported to the site. Is done. Therefore, the steel deck 6 is manufactured in a size suitable for transportation with the bridge surface divided. The plane size of the steel slab 6 is such that the dimension (width) in the direction perpendicular to the bridge axis is such that it is about the width of the flange of the main girder (that is, the distance between the main girder or a little narrower than this). The dimension (length) in the direction can be a transportable length (for example, 5 to 10 m). The steel floor slab 6 divided and manufactured in this way is arranged on the site and fixed to the main girder 4. Of course, depending on the size of the bridge surface, one steel deck 6 can be created without being divided and fixed to the main girder 4 on site.

  Conventionally, when installing horizontal ribs on a steel slab, a semi-finished product in which a bottom steel plate and vertical ribs are welded and fixed at the factory is fixed on the main girder at the site, and then the bottom steel plate and horizontal ribs are bolted. It was fixed. From such a structure, the lateral ribs are inevitably designed to support the weight of the floor slab concrete until it hardens and to resist the cross-sectional force generated by the live load after the bridge is used. In particular, with regard to the shearing force due to the live load after in-service, the ratio of the horizontal ribs is relatively large, and as a result, the horizontal ribs have an inverted T-shaped cross section with a web attached to the lower flange. It was a member having a cross-sectional resistance. On the other hand, the lateral rib 10 used for the steel slab 6 of the present invention is a supplement intended to support the concrete weight until the floor slab concrete 7 is hardened and to prevent buckling of the steel slab 6. Since it is a rigid material and the horizontal rib 10 is not embedded in the floor slab concrete 7 and fixed to the main girder 4 or the like, it is not necessary to bear a shearing force or the like due to a live load after the use of the bridge. It can be a member having a small cross-sectional resistance force. Therefore, the horizontal rib 10 used for the steel deck 6 of the present invention can be a plate rib that has not been conventionally used.

  In addition, the conventional steel floor slab with horizontal ribs protrudes from the lower surface of the floor slab, which not only obstructs the space under the bridge but also damages the landscape. On the other hand, in the steel slab 6 of the present invention, since the horizontal ribs 10 are embedded in the floor slab concrete 7, the space under the bridge is not obstructed and the landscape is not impaired.

  In addition, the conventional steel floor slab with horizontal ribs is fixed at the factory by semi-finished products in which the bottom steel plate and vertical rib are welded and fixed on the main girder, and then the bottom steel plate bottom surface and the horizontal rib are fixed with bolts. Was. Therefore, not only the fixing work with the lateral rib becomes a critical process in the field, but also safety is lowered for a third party who passes under the bridge during the fixing work. On the other hand, in the steel floor slab 6 of the present invention, although the labor for crossing the vertical ribs 9 and the horizontal ribs 10 occurs, the fixing work of the bottom steel plate 8, the vertical ribs 9 and the horizontal ribs 10 is usually performed in a factory. Compared to the above, the work period at the site is shortened by the work of fixing the lateral rib 10 to the bottom steel plate 8, and the safety to third parties is also increased.

(Main digit)
The main girder 4 has an I-shaped cross section as shown in FIG. The main girder 4 shown in FIG. 3 is obtained by attaching an upper flange and a lower flange to a belly plate (web), and is manufactured (built up) using steel as a material. Therefore, the upper flange can be manufactured with a relatively high degree of freedom, for example, with the upper flange inclined at a road crossing gradient (for example, 2%). The main girder 4 is not limited to a factory-made product, and a commercially available shape steel (I-shaped steel, H-shaped steel, groove-shaped steel, etc.) can also be used when the main girder spacing is short as shown in FIG. . The arrangement number, arrangement interval, or standard of the main beam 4 is designed by calculation under various given conditions such as design load and span length.

(Combination of main girder and steel deck)
As shown in FIGS. 2 and 3, the steel deck 6 is placed on the upper flange of the main girder 4. The steel deck 6 produced by dividing the width direction at main girder intervals is passed to the adjacent main girder 4 and main girder 4 and arranged (FIG. 3). Further, the steel slab 6 manufactured by being divided in the bridge axis direction in addition to the direction perpendicular to the bridge axis is sequentially arranged in the bridge axis direction on two adjacent main girders 4. In this case, the steel slabs 6 that are abutted in the bridge axis direction are connected to each other at the joint portion by using an attachment plate or the like.

  A steel deck 6 disposed on the upper flange of the main girder 4 is bolted to the main girder 4. Of course, as long as it can be fixed to the main girder, other conventional methods such as welding can be used in addition to bolt fixing. The steel slab 6 is not limited to being disposed on two adjacent main girders 4 but can be disposed and fixed on three or more main girders 4 or the steel slab 6 can be divided. It is also possible to manufacture a single steel deck 6 that covers the entire bridge surface without disposing it and place and fix it on the main girder 4.

(Floor slab concrete)
As shown in FIG. 2, on the steel deck 6 fixed to the main girder 4, after securing the designed cover, the main reinforcement 12a is perpendicular to the bridge axis and the distribution reinforcement 12b is arranged at a predetermined interval in the bridge axis direction. I will arrange with. At this time, a so-called horsestrip can be installed to secure the cover, but depending on the cover, the main bar 12a may be placed directly on the vertical rib 9, the power distribution bar 12b may be put directly on the horizontal rib 10, or the vertical rib. It is also possible to place the main bar 12a through the through hole 9a provided in the bar 9.

  After the reinforcing bars 12 are arranged, the concrete 11 is placed by assembling molds on both end face surfaces (face surfaces) in the bridge axis direction and both end face surfaces (side faces) in the direction perpendicular to the bridge axis. At this time, since the bottom steel plate 8 of the steel floor slab 6 serves as a mold, the bottom mold can be omitted. Further, if the side steel plates extending in the bridge axis direction and standing upright are fixed to the both ends of the steel floor slab 6 in the direction perpendicular to the bridge axis, the side formwork can be omitted, and the side steel plates can be used by the side steel plates. The plate 6 is reinforced (stiffened). In addition, when placing the concrete 11, the concrete cover 14 can also be placed on the ground cover 14, or the concrete can be placed on the ground cover 14 once the floor slab concrete 7 is constructed. it can.

  After the concrete 11 of the floor slab concrete 7 is hardened, an asphalt pavement 13 is applied to the surface layer, and a protective fence 15 is installed on the ground cover 14.

(Structure of synthetic steel deck)
The synthetic steel slab 5 includes a steel slab 6 and floor slab concrete 7 and is connected to the main girder 4. Therefore, the synthetic steel slab 5 receives a bending moment and a shearing force as a simple beam (or continuous beam) perpendicular to the bridge axis with the main girder 4 as a fulcrum (however, until the concrete 11 is hardened, Among them, the bottom steel plate 8 and the lateral rib 10 bear a bending moment and shear force due to dead load). The main girder 4 receives bending moment and shearing force in the bridge axis direction, and the effective width (perpendicular to the bridge axis) of the composite steel deck 5 connected to the main girder 4 is also the bending moment and shearing force in the bridge axis direction. Can bear. At this time, the floor slab concrete 7 (reinforced concrete), the bottom steel plate 8, and the vertical ribs 9 effectively act on the bending moment and the like. Thus, it is possible to resist the bending moment and shear force in the bridge axis direction with the effective width of the main girder 4 and the composite steel deck 5.

  The lateral rib 10 fixed to the steel deck 6 constituting the synthetic steel deck 5 is a stiffener for the purpose of preventing buckling of the longitudinal rib 9. 4A and 4B are analysis result diagrams for confirming the stiffening effect of the lateral rib 10. In this analysis, synthetic steel slabs are modeled with shell elements and the buckling eigenvalues and buckling modes are analyzed by linear buckling analysis. FIG. 4A shows the calculation result of the synthetic steel slab without the lateral rib 10, and FIG. 4B shows the calculation result of the synthetic steel slab 5 with the lateral rib 10. Compared to FIG. 4A, in FIG. 4B, the lateral rib 10 is a node with respect to the buckling of the longitudinal rib 9, and the buckling strength of FIG. As a result, it was confirmed that the lateral rib 10 contributes to prevention of buckling of the longitudinal rib 9.

(Example of construction)
An example of the construction method of the synthetic steel floor slab bridge of the present invention is shown below.
(1) Excavation for the abutment 2 is performed at predetermined positions on both banks of the river.
(2) After confirming the design support ground, formwork and reinforcement work are performed, concrete is placed, and two abutments (right bank side and left bank side) are completed.
(3) In parallel with the abutment 2 construction (or before the abutment 2 construction), the steel slab 6 is manufactured at the factory. The steel slab 6 is a piece (unit) divided in the bridge axis direction and the bridge axis perpendicular direction, and is manufactured by fixing the vertical rib 9 and the horizontal rib 10 to one side (same surface) of the bottom steel plate 8 by welding. .
(4) The main girder 4 is placed on the girder hanging portion provided on the abutment 2 and the main girder 4 is installed on the abutment 2.
(5) The steel deck 6 transported from the factory to the site is arranged between the two adjacent main girders 4 and arranged in the bridge axis direction.
(6) The steel slab 6 arranged at a predetermined position is bolted to the main girder 4, and the steel slabs 6 adjacent to each other in the bridge axis direction are fixed with bolts by applying an attachment plate.
(7) Reinforcement 12 is assembled on the steel slab 6 and the formwork is installed on the side surface (both end surface in the direction of the bridge axis) and the end surface (both end surface in the direction perpendicular to the bridge axis), and the concrete 11 is placed. .
(8) After curing the concrete 11, the mold is removed, and the asphalt pavement 13, the ground cover 14, the protective fence 15, and the like are completed to complete the bridge 1.

  The construction method of the synthetic steel floor slab bridge of the present invention, the steel floor slab with ribs, and the synthetic steel floor slab bridge are not limited to bridges over rivers, overpasses over roads, overpasses over roads, and other viaducts It can be used for various bridges.

DESCRIPTION OF SYMBOLS 1 Bridge 2 Abutment 3 Bridge girder 4 Main girder 5 Synthetic steel floor slab 6 Steel floor slab 7 Floor slab concrete 8 Bottom steel plate 9 Vertical rib 9a (Vertical rib) through-hole 10 Horizontal rib 11 Concrete 12 Reinforcement 12a Main reinforcement 12b Distribution bar 13 Asphalt pavement 14 Ground cover 15 Guard fence A (Conventional) Vertical rib B (Conventional) Bottom steel plate C (Conventional) Horizontal rib

Claims (5)

In a construction method of a synthetic steel deck slab bridge comprising a main girder and a synthetic steel deck having a steel deck and floor slab concrete,
A ribbed steel floor slab in which a plurality of vertical ribs arranged in parallel or substantially parallel and a plurality of horizontal ribs arranged orthogonally or substantially orthogonally to the vertical ribs are fixed to the same surface of the bottom steel plate, A ribbed steel slab installation process that connects to the main girder;
A bar arrangement process for arranging reinforcing bars on the steel plate with ribs,
A method for constructing a synthetic steel slab bridge, comprising forming a synthetic steel slab by a construction method comprising a concrete placing step of placing concrete on the ribbed steel slab. In the steel plate with ribs that make up the synthetic steel plate,
A plurality of vertical ribs arranged in parallel or substantially parallel to one surface of the bottom steel plate are fixed,
On the surface of the bottom steel plate to which the vertical ribs are fixed, a plurality of horizontal ribs arranged orthogonally or substantially orthogonally to the vertical ribs are fixed,
A ribbed steel slab in which the vertical ribs and the horizontal ribs are arranged and fixed in a lattice pattern on the bottom steel plate. In the steel floor slab with ribs according to claim 2,
A steel slab with ribs, wherein each longitudinal rib is provided with a plurality of through holes. In the steel floor slab with ribs according to claim 2 or claim 3,
A steel floor slab with ribs, wherein the lateral ribs are plate ribs using a plate material. In a synthetic steel deck slab bridge comprising a main girder and a synthetic steel deck having a steel deck and floor slab concrete,
A synthetic steel deck slab bridge, wherein the steel deck is the ribbed steel deck according to any one of claims 2 to 4.

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