JP3867149B2 - Steel slab structure of bridge and steel slab reinforcement method - Google Patents

Description

  The present invention relates to a steel deck structure of a bridge and a steel deck reinforcement method.

  A bridge having a steel deck structure will be described with reference to FIGS. The steel floor slab 100 includes a deck plate 102, a plurality of vertical ribs 104 that extend parallel to the longitudinal direction of the steel floor slab 100 on the lower surface of the deck plate 102, and extends across the vertical ribs 104. A horizontal rib 106, a vertical rib 104, a main girder 110 that supports the horizontal rib 106, and a pavement 108 provided on the upper surface of the deck plate 102 are provided.

  However, steel slab structures have been widely used for long-span bridges and the like because of their light weight. However, in recent years, many fatigue damages have been reported mainly on bridges with heavy traffic, and in particular, many damages that break the weld between the bottom surface of the deck plate and the vertical ribs have been found.

  It is necessary to reinforce the steel floor slab that has been damaged by fatigue in this way so that the damaged portion is repaired and the same damage is not caused again. As a reinforcing method, it is conceivable to attach a steel plate to a deck plate or to lay steel fiber reinforced concrete by removing all pavements. However, the method of attaching the steel plate to the deck plate cannot be expected to have a practical effect. On the other hand, in order to lay steel fiber reinforced concrete, a large machine is required, and it takes a long time for construction such as concrete curing, and there is a problem that traffic must be completely blocked during construction. In the case of a new bridge construction, it is effective as a construction method for a steel deck with high strength, but it cannot be used as a reinforcement for the steel deck of an existing bridge.

  The present invention has a technical problem to solve such problems of the prior art, and provides a steel floor slab structure of a bridge and a method for reinforcing a steel floor slab, which can perform a steel floor slab reinforcement work in a short time in a minimum work space. It is intended to provide.

The present invention according to claim 1 is a deck plate, a plurality of vertical ribs extending in parallel to the longitudinal direction of the bridge on the lower surface of the deck plate, and the vertical ribs perpendicular to the longitudinal direction of the bridge In the steel floor slab structure of the bridge having a lateral rib extending across the deck plate and a pavement provided on the top surface of the deck plate, a concrete precast panel laid on the top surface of the deck plate, and the concrete Joining means for joining a precast panel to the upper surface of the deck plate, and the concrete precast panel is arranged so that its longitudinal direction intersects the longitudinal direction of the bridge in a horizontal and vertical direction. The main feature is the steel deck structure of the bridge.

The present invention according to claim 7 includes a deck plate, a plurality of vertical ribs extending on the lower surface of the deck plate in parallel to the longitudinal direction of the bridge, and the vertical ribs perpendicular to the longitudinal direction of the bridge. In the steel floor slab reinforcement method for a bridge having a transverse rib extending across the deck plate and a pavement provided on the top surface of the deck plate, the top surface of the deck plate is removed by removing at least a part of the pavement. The adhesive is applied to the top surface of the deck plate, and the concrete precast panel is applied to the top surface of the deck plate to which the adhesive has been applied . The longitudinal direction of the deck plate intersects with the longitudinal direction of the bridge. spread to, steel deck Retrofit that comprises embedding the concrete precast panels superimposed a thin layer paving on the upper surface of the concrete precast panel The gist.

  According to the present invention, it is possible to partially reinforce a steel floor slab of a bridge on an important route that cannot completely block traffic due to reinforcement work. By joining the concrete precast panel to the deck plate, a concrete precast panel of a size that can be transported by hand can be given sufficient strength to the steel deck, so the concrete precast panel is spread on the top surface of the deck plate. Therefore, it is possible to carry out reinforcement work without using heavy machinery.

  Hereinafter, a preferred embodiment of the present invention will be described with reference to FIGS. 1 to 6, the same reference numerals are given to the components common to the steel plate slab 100 of the bridge shown in FIGS. 7 and 8, and redundant description is omitted in the following description. .

  1 and 2, a steel plate slab structure 10 of a bridge according to a preferred embodiment of the present invention is a concrete precast panel attached to an upper surface of a deck plate 102 of a steel slab 100 by an adhesive 16 as a joining means. 12 is provided. The concrete precast panel 12 is embedded in the pavement 108 on the deck plate 102 so as to be flush with the other pavement portions 108 by the thin pavement 14. The thin pavement 14 does not necessarily need to use the same pavement material as that of the pavement portion 108, but preferably the asphalt pavement can complete the work in a shorter time than concrete, and in particular the existing important route Suitable for reinforcing steel decks of bridges.

  The concrete precast panel 12 can be made in any size and shape from various materials according to the scale of the bridge to be reinforced, but for example, silica fume or lime powder and reinforcing short fibers such as steel fibers are kneaded. Then, after molding into a rectangular panel having a width of 1000 mm, a length of 1500 mm, and a thickness of about 40 mm, a high-strength concrete precast panel cured with an autoclave can be obtained. As an example, a ductal can be used.

  The concrete precast panel 12 is preferably arranged so that the longitudinal direction of the concrete precast panel 12 intersects with the longitudinal ribs 104 in a transverse direction, that is, in a horizontal and vertical direction with respect to the extending direction of the longitudinal ribs 104. As shown in FIG. 3, it is spread on the upper surface of the deck plate 102 in a zigzag manner and joined to the deck plate 102 with an adhesive 16 as a joining means. In the present specification, the “adhesive” includes a polymer material and mortar.

  Hereinafter, with reference to FIG. 4 to FIG. 6, a method for constructing a bridge reinforcement structure according to the present invention will be described by taking as an example a reinforcement work on an existing bridge by a concrete precast panel 12.

  First, a part 108a of the asphalt pavement on the upper surface of the existing bridge is removed to expose the upper surface of the deck plate 102 (FIG. 4). Next, an adhesive 106 as a joining means is applied to the upper surface of the deck plate 102 (FIG. 5), and the concrete precast panel 12 is spread, and a thin layer pavement 14 is laid on the upper surface of the concrete precast panel 12 so as to form the concrete precast. The panel 12 is embedded in the pavement 108 (FIG. 6). By using an adhesive as a joining means, a slight distortion of the upper surface of the deck plate 102 and a mismatch between the surface of the concrete precast panel 12 are absorbed by the layer of the adhesive 16, and the deck plate 102 and the concrete precast panel 12 are integrated. It becomes possible to improve the nature.

The preferred embodiments of the present invention have been described above, but the present invention is not limited thereto, and it is obvious to those skilled in the art that various changes and modifications are possible.
For example, the example of the adhesive 16 has been described as a joining means for joining the concrete precast panel 12 to the upper surface of the deck plate 102, but the present invention is not limited to this, and acts on the concrete precast panel 12 in addition to the adhesive 16. A shear connector 20 that is a member that takes charge of a horizontal force and a shearing force may be used.

  In the present embodiment, the shear connector 20 includes a plate 22 fixed to the upper surface of the deck plate 102 by the same adhesive as the adhesive 16 or other adhesive such as a mechanical fastener such as a bolt, or the like. A fixed stud bolt 24 and a nut 26 screwed into the stud bolt 24. After passing the stud bolt 24 through a through hole 12a formed at a corresponding position of the concrete precast panel 12, the nut 26 is attached to the stud bolt 24. The concrete precast panel 12 is fastened to the plate 22 by screwing. Preferably, counterbore holes 12b are formed around the through holes 12a of the concrete precast panel 12 so that the tips of the stud bolts 24 and the nuts 26 do not protrude from the pavement surface.

  In the above-described embodiment, the concrete precast panels 12 have been described as being arranged in a staggered manner on the upper surface of the deck plate 102. However, various laying patterns may be considered, and the concrete precast panels 12 may be arranged in rows and columns.

  Further, in the above-described embodiment, the shear connector 20 is described as including the stud bolt 24 that is erected and fixed to the plate 22 that is coupled to the deck plate 102. It is good also as a rib and a welding reinforcement.

It is sectional drawing of the steel deck structure by preferable embodiment of this invention. It is a fragmentary sectional view which expands and shows a part of steel plate structure of FIG. It is a top view which shows the concrete precast panel spread | laid on the deck plate. It is a figure for demonstrating the construction method of the reinforcement structure of the bridge by this invention. It is a figure for demonstrating the construction method of the reinforcement structure of the bridge by this invention. It is a figure for demonstrating the construction method of the reinforcement structure of the bridge by this invention. It is the partially broken perspective view which looked at the bridge which has a steel floor slab structure from diagonally upward. It is the perspective view which looked at the steel deck structure of the bridge from diagonally downward.

Explanation of symbols

10 Steel floor slab structure 12 Concrete precast panel 14 Thin layer pavement 16 Adhesive 20 Shear connector

Claims (10)

A deck plate, a plurality of vertical ribs extending in parallel to the longitudinal direction of the bridge on the lower surface of the deck plate, and a lateral rib extending across the vertical rib perpendicular to the longitudinal direction of the bridge And a steel floor slab structure of a bridge having a pavement provided on the upper surface of the deck plate,
A plurality of concrete precast panels laid on the top surface of the deck plate;
A joining means for joining the concrete precast panel to the upper surface of the deck plate ;
The concrete precast panel is arranged so that its longitudinal direction intersects with the longitudinal direction of the bridge in a horizontal and vertical direction . The steel floor slab structure according to claim 1, wherein the concrete precast panels are arranged in a staggered manner. The steel floor slab structure according to claim 1, wherein the concrete precast panel is manufactured to a size that can be transported manually.   The steel slab structure according to claim 1, wherein the joining means includes an adhesive applied between the deck plate and the concrete precast panel. The joining means further includes a stud bolt standing and fixed on the upper surface of the deck plate, and a nut screwed to the stud bolt,
The steel floor slab structure according to claim 4, wherein the concrete precast panel has a through hole through which the stud bolt is inserted.   The steel floor slab structure according to claim 5, wherein the concrete precast panel has countersink holes concentric with the through holes around the through holes. A deck plate, a plurality of vertical ribs extending in parallel to the longitudinal direction of the bridge on the lower surface of the deck plate, and a lateral rib extending across the vertical rib perpendicular to the longitudinal direction of the bridge And in the steel plate slab reinforcement construction method of the bridge having a pavement provided on the upper surface of the deck plate,
Removing at least a portion of the pavement to expose the top surface of the deck plate;
Apply an adhesive on the top surface of the deck plate,
Laying the concrete precast panel on the top surface of the deck plate coated with adhesive so that its longitudinal direction intersects the horizontal and vertical direction with respect to the longitudinal direction of the bridge ,
A steel slab reinforcement method comprising: laying a thin pavement on an upper surface of the concrete precast panel to bury the concrete precast panel. The steel floor slab reinforcement method according to claim 7, wherein the concrete precast panels are arranged in a staggered manner. The steel floor slab reinforcement method according to claim 7, wherein the concrete precast panel is manufactured in advance to a size that can be transported manually. Furthermore, a stud bolt is erected and fixed on the upper surface of the deck plate,
Steel deck Retrofit of claim 7 including securing the said concrete precast panels on the upper surface of the deck plate with a nut screwed to the stud bolt and the stud bolt.

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