JP4641235B2 - Steel slab and repair method of steel slab - Google Patents

Description

  The present invention relates to a steel deck and a method for repairing a steel deck in a bridge or an elevated road.

The steel deck is welded with a plurality of U-ribs (vertical ribs) forming a closed cross section extending in the longitudinal direction (traveling direction) on the lower surface of the steel deck plate that constitutes the floor deck of the traveling path. ing.
Recently, it has been found that the deck plate is locally bent by the passing vehicle load, and this weld is subjected to excessive stress, causing cracks. This crack progresses to either the deck plate side or the weld bead side from the root portion.
In addition, as another factor, this welded part is constructed by one side fillet welding from the outside of the U-rib, so that there is an undissolved part in the inner welding root part, and in particular, a part where stress concentration occurs and the fatigue strength is low. Forming.

As what prevents the generation | occurrence | production or progress of this crack, what is shown by patent document 1 and patent document 2 is proposed, for example.
In Patent Document 1, a filler made of lightweight foamed concrete is injected into a closed cross-sectional space of a U-rib and solidified to increase the local bending rigidity of the deck plate in this portion.
The technique disclosed in Patent Document 2 is intended to prevent cracks by using a steel material that reduces the occurrence and / or progress of fatigue cracks in a deck plate to which U-ribs are welded.

JP 2001-248114 A JP 2003-183769 A

However, since the filler made of lightweight foamed concrete has a small volume elastic modulus, the one shown in Patent Document 1 has a local deck plate portion caused by a vehicle load when used in a closed region such as a U-rib closed cross-sectional space. Resistance to bending deformation is unlikely to occur. For this reason, there was a problem that the stress reduction effect due to relaxation of stress concentration at the welded joint between the U rib and the deck plate was small.
In addition, there is a problem that a relatively long curing time is required until the injected lightweight foamed concrete is solidified, and that the traffic of the vehicle needs to be stopped during this time.

Next, although the thing shown by patent document 2 is improving the fatigue strength of the welding start end, the effect with respect to the fatigue of a root part is unknown.
In addition, it is technically and economically difficult to replace a steel plate such as a deck plate with an in-service bridge or the like, and there is a problem that it cannot be used for repairing an existing bridge or the like.
Furthermore, since the inside of the U-rib is a closed space, there is a problem that it is difficult to monitor the internal crack condition and the like.

  In view of the above problems, the present invention provides a steel deck and a method for repairing a steel deck that can effectively reduce the stress applied to the root portion and prevent the occurrence of cracks without reducing the strength. Objective.

In order to solve the above problems, the present invention employs the following means.
That is, the steel slab according to the present invention comprises a plurality of longitudinal ribs in the width direction forming a closed cross section extending in the longitudinal direction on the lower surface of the deck plate constituting the floor slab of the traveling path, In the steel slab comprising a plurality of lateral ribs extending in the width direction at intervals in the direction, the side surfaces of the longitudinal ribs positioned between the lateral ribs extend over substantially the entire length in the longitudinal direction. An attached reinforcing member, and an open hole provided on the lower surface of the vertical rib located between the horizontal ribs and extending in the longitudinal direction and provided with a length substantially equal to the reinforcing member. It is characterized by that.

According to the present invention, the open hole extends in the longitudinal direction on the lower surface of the vertical rib located between the horizontal ribs, and is at least approximately the same length as the reinforcing member, that is, approximately the same length as the distance between the lateral ribs. Therefore, the vertical ribs forming the closed section are opened over substantially the entire length.
When the closed cross section of the vertical rib is opened, the torsional rigidity as the vertical rib is remarkably reduced, so that the stress applied to the joint portion with the deck plate can be reduced, and the occurrence of cracks in the root portion can be prevented.
In addition, since the reinforcing member is attached to the side surface of the vertical rib located between the horizontal ribs over substantially the entire length in the longitudinal direction, the bending rigidity and the torsional rigidity decrease as the function of the vertical rib supporting the deck plate is impaired. Can be prevented.

  Moreover, the steel deck according to the present invention is characterized in that the joint between the vertical rib and the lower surface of the deck plate is welded from the inside of the vertical rib.

  As described above, since the joint portion between the vertical rib and the lower surface of the deck plate is welded from the inside of the vertical rib, the unmelted root portion disappears and the throat thickness of the welded portion increases. For this reason, the fatigue strength of a junction part can be improved.

  Further, the steel deck according to the present invention includes an existing welded portion outside the vertical rib and a welded portion from the inside of the vertical rib at a joint portion between the vertical rib and the lower surface of the deck plate. It features a smooth finish on the toe.

By doing in this way, the fatigue strength not only of the above-mentioned root part but also the toe part can be improved, so that the fatigue strength of the entire joint part can be further improved.
In addition, in order to finish a toe part smoothly, the method of cutting with a grinder etc., the method of melting a toe part by TIG arc heat using a TIG welding machine, etc. are used, for example.

  In the steel slab according to the present invention, the reinforcing member is disposed outside the side surface of the vertical rib, leaving a space inside the vertical rib.

  By doing in this way, inspection using a flaw detection apparatus etc. can be easily performed visually during use after completion of construction.

The said invention WHEREIN: It is suitable to provide the 1st connection member which connects the edge part of the said reinforcement member, and the said horizontal rib.
Moreover, in the said invention, it is suitable to provide the 2nd connection member which connects between the edge parts of the said adjacent reinforcement member inside the said vertical rib.
If it does in this way, since a reinforcement member will be continuously provided over the full length of a vertical rib by the 1st connection member or the 2nd connection member, the reinforcement effect with respect to a vertical rib can be strengthened.

  A method for repairing a steel deck according to the present invention comprises a plurality of longitudinal ribs in the width direction that form a closed cross section extending in the longitudinal direction on the lower surface of a deck plate constituting a deck of a traveling path, In the repair method of a steel deck slab comprising a plurality of lateral ribs extending in the width direction at intervals in the longitudinal direction, the longitudinal direction of the longitudinal ribs located between the lateral ribs is arranged in the longitudinal direction. A reinforcing member attaching step for attaching the reinforcing member over substantially the entire length, and an open hole extending in the longitudinal direction on the lower surface of the vertical rib located between the lateral ribs to a length substantially equal to at least the length of the reinforcing member. And a hole forming step provided across the board.

According to the present invention, the open hole extends in the longitudinal direction on the lower surface of the vertical rib located between the horizontal ribs, and is at least approximately the same length as the reinforcing member, that is, approximately the same length as the distance between the lateral ribs. Therefore, the vertical ribs forming the closed section are opened over substantially the entire length.
When the closed cross section of the vertical rib is opened, the torsional rigidity as the vertical rib is remarkably reduced, so that the stress applied to the joint portion with the deck plate can be reduced, and the occurrence of cracks in the root portion can be prevented.
In addition, since the reinforcing member is attached to the side surface of the vertical rib located between the horizontal ribs over substantially the entire length in the longitudinal direction, the bending rigidity and the torsional rigidity decrease as the function of the vertical rib supporting the deck plate is impaired. Can be prevented.

  Moreover, the repair method of the steel deck according to the present invention is characterized in that, after the drilling step, a joint portion between the vertical rib and the lower surface of the deck plate is welded from the inside of the vertical rib.

  In this way, after the drilling step, the joint between the vertical rib and the bottom surface of the deck plate is welded from the inside of the vertical rib, so there is no undissolved root portion, and the throat thickness of the weld at the joint Will increase. For this reason, the fatigue strength of a junction part can be improved.

  Moreover, the repair method of the steel deck according to the present invention is characterized in that after the reinforcing member attaching step, the end portion of the reinforcing material and the lateral rib are connected by a first connecting member.

  As described above, after the reinforcing member attaching step, the end portion of the reinforcing material and the horizontal rib are connected by the first connecting member, so that the reinforcing member is continuous over the entire length of the vertical rib by the first connecting member and the horizontal rib. Will be provided. For this reason, the reinforcement effect with respect to a vertical rib can be strengthened.

  Moreover, in the repair method of the steel deck according to the present invention, the reinforcing member attaching step is performed prior to the drilling step.

  Thus, since the reinforcing member attaching step is performed prior to the hole drilling step, the vertical ribs are first reinforced by the reinforcing member. For this reason, even when the vehicle load is applied, it is possible to prevent the vertical rib from yielding, buckling, etc. due to the strength reduction accompanying the processing of the open hole, so that the repair work can be performed without stopping the traffic on the road. it can.

  Moreover, the repair method of the steel deck according to the present invention is characterized in that, after the drilling step, the ends of the adjacent reinforcing members are connected to each other inside the vertical ribs by a second connecting member. .

  Thus, since the end portions of adjacent reinforcing members are connected to each other inside the vertical ribs by the second connecting members after the hole drilling step, the reinforcing members are continuous over the entire length of the vertical ribs by the second connecting members. Will be provided. For this reason, the reinforcement effect with respect to a vertical rib can be strengthened.

  According to the present invention, since the reinforcing member is provided over the entire length of the side surface of the vertical rib and the open hole is provided on the lower surface, the stress applied to the root portion is effectively reduced and cracking is prevented without lowering the strength. it can

Embodiments according to the present invention will be described below with reference to the drawings.
[First embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a perspective view showing a schematic steel plate 1 of a bridge.
The steel deck 1 includes a deck plate 3, a U rib (vertical rib) 5, a lateral rib 7, and a main girder 9.
The deck plate 3 is made of steel, and a traveling path 11 is formed on the upper surface thereof.
The U rib 5 is made of steel, has a U-shaped closed cross section, and extends in the longitudinal direction of the deck plate 3. A plurality of U ribs 5 are arranged in the width direction and are welded to the lower surface of the deck plate 3.

The lateral ribs 7 are made of steel, and a plurality of lateral ribs 7 are installed at intervals in the longitudinal direction of the deck plate 3. Each lateral rib 7 is arranged to extend in the width direction on the lower surface of the deck plate 3 and is welded to the deck plate 3 at a portion that avoids the U rib 5.
The U-rib 5 and the lateral rib 7 form a grid-like structure and is configured to support the deck plate 3.
The main girder 9 supports the deck plate 3 and the like with respect to the base.

FIG. 2 is a cross-sectional view (seen in the longitudinal direction) showing a part of the deck plate 3 part. 3 is a cross-sectional view taken along the line XX of FIG. FIG. 4 is a Y view of FIG. FIG. 5 is a Y view of FIG. 2 showing an initial state of construction.
6 to 8 show the U-rib 5 in the vicinity of the lateral rib 7, FIG. 6 is a transverse sectional view, FIG. 7 is a side view, and FIG. 8 is a bottom view. FIG. 9 is an enlarged partial cross-sectional view showing a part of FIG. 6 in an enlarged manner.
Hereinafter, the U-rib 5 located at the site where the wheel 15 of the vehicle traveling on the traveling path 11 acts will be described.
Here, the description will be made assuming that the wheel 15 acts only on one U-rib 5, but there is at least one other position where the wheel 15 passes, and these wheels 15 are adjacent to each other. In some cases, a plurality of matching U ribs 5 are affected. In this case, the plurality of U-ribs 5 in the vicinity thereof have the same configuration.

On both side surfaces of the U-rib 5, the long side portions of the reinforcing members 13, 13 each formed of unequal side mountain steel are fixed and attached by bolts. The short sides of the reinforcing members 13 are located below.
If it does in this way, inspection of the joined part etc. of U rib 5 and deck plate 3 will become easy.
The reinforcing members 13, 13 may be flat steel or groove steel.
The reinforcing members 13 and 13 have substantially the same length as the distance between the adjacent lateral ribs 7.
The end portions of the reinforcing members 13 and 13 and the lateral ribs 7 are connected to each other by L-shaped members (first connecting members) 15 formed of unequal mountain-shaped steel.
Accordingly, the reinforcing members 13, 13 adjacent in the longitudinal direction are integrally formed by the L-shaped member 15, the lateral rib 7, and the adjacent L-shaped member 15, and thus are continuously reinforced over the entire length of the U rib 5. A structure will be formed.

Note that the L-shaped member 15 can be omitted if the reinforcing members 13 can provide sufficient strength.
If it does in this way, material cost and construction man-hours can be reduced by the part which omits the L-shaped member 15.

On the lower surface of the U-rib 5, an open hole 17 is formed which extends in the longitudinal direction and is provided with a length substantially equal to at least the reinforcing members 13.
The joint between the U rib 5 and the deck plate 3 is welded from the inside of the U rib 5 as indicated by a weld bead (welded portion) 19. The outer end of the weld bead 19 is united with the inner end of an existing weld bead (welded portion) 20 provided on the outer side of the U-rib to form an integrated weld bead.

A repair method for repairing the U rib 5 in the steel deck 1 described above will be described.
First, as shown in FIG. 5, a plurality of hand holes 21 are opened on the lower surface of the U rib 5 at predetermined intervals in the longitudinal direction. The hand hole 21 has a diameter of about 100 mm.
Further, bolt holes are opened at predetermined positions on both side surfaces of the U rib 5 by gas cutting, for example.
Next, the reinforcing members 13 and 13 having bolt holes at predetermined positions are positioned at the installation positions.
Then, a bolt is inserted into each bolt hole from the outside, a hand is inserted from the hand hole 21, and a nut is attached to each bolt from the inside. Thereafter, the bolts are tightened to fix the reinforcing members 13 and 13 to the side surfaces of the U rib 5.
Thereafter, the end portions of the reinforcing members 13 and 13 and the lateral ribs 7 are connected by the L-shaped member 15.
If one-side bolts are used for attaching the reinforcing members 13 and 13, the processing of the handhole 21 is not necessary, and the number of man-hours can be omitted.

Next, an open hole 17 is formed in the lower surface of the U rib 5 by, for example, gas cutting.
As described above, since the opening 17 is performed after the reinforcing members 13 and 13 are attached, the U-rib 5 is first reinforced by the reinforcing members 13 and 13. For this reason, even if the vehicle load is applied, it is possible to prevent the U-rib 5 from yielding or buckling due to the strength reduction caused by the processing of the opening hole 17, so that the repair work can be performed without stopping the traffic on the travel path 11. It can be carried out.
And a welding apparatus is inserted from the open hole 17, and the junction part of the U rib 5 and the deck plate 3 located inside the U rib 5 is welded.

As shown in FIG. 9, this welding is performed to such an extent that the weld bead 19 merges with the inside of the existing weld bead 20 applied to the outside.
Thus, since the weld bead 19 merges with the existing weld bead 20, the throat thickness N increases significantly.
Then, the start ends 22 of the weld beads 19 and 20 are cut by a grinder so as to approach the steel deck 3 or the U rib 5 with a smooth curve.
This starting end treatment is not limited to a grinder, and may be performed by TIG arc heat using a TIG welding machine, or may be performed using other appropriate means.
In addition, this welding may be partially applied as necessary in view of the state of the joint, or may not be applied if unnecessary.
In some cases, the open hole 17 may be closed.

Next, the action and effect of the steel deck 1 according to this embodiment will be described.
According to the present embodiment, the open hole 17 extends in the longitudinal direction on the lower surface of the U-rib 5 located between the horizontal ribs 7 and is at least approximately the same length as the reinforcing members 13, 13, that is, between the horizontal ribs 7. Therefore, the U-rib 5 that forms the closed cross-section is opened over substantially the entire length.
When the closed cross section of the U rib 5 is opened, the torsional rigidity as the U rib 5 is remarkably reduced, so that the stress applied to the joint portion with the deck plate 3 can be remarkably reduced, and cracks in the root portion can be reduced. Occurrence can be prevented.

FIG. 10 shows an example of FEM analysis of the stress acting on the root portion before and after the repair of the deck plate 3 repaired in the present embodiment.
In the analysis model, U ribs 5 of length 2800 mm × width 320 mm × height 240 mm × plate thickness 6 mm are attached to a deck plate 3 having a length of 2800 mm × width of 2800 mm × thickness (plate thickness) of 12 mm at intervals of 640 mm. . Further, horizontal ribs 7 of length 2800 mm × height 450 mm × thickness 12 mm are attached at intervals of 2500 mm. The weld throat thickness is 6 mm.
The load condition is that a load of 120 kN is applied from the end portion (point A) of the U rib 5 with the analysis model to the middle portion between both end portions (point B and point C) of the adjacent U rib 5.

このように、Ｕリブ５の応力は、補修前に点Ａで最大２００Ｎ／ｍｍ^２だったが、補修により当該位置では９８Ｎ／ｍｍ^２と半分以下に低下している。近接溶接部（点Ｂ）では補修後は逆に増加しているが、応力値１３６Ｎ／ｍｍ^２は補修前の点Ａから見ると約３０％低下しており、全体としては応力が低下している。 As a result of analyzing all the elements as shell elements, the deck plate 3 was deformed as shown by a line 30 and the stress of the U rib 5 at points A, B, and C was as follows.

As described above, the stress of the U-rib 5 was 200 N / mm ² at the maximum at the point A before the repair, but it is reduced to 98 N / mm ² and less than half at the position due to the repair. In the proximity welded area (point B), it increases on the contrary after the repair, but the stress value 136 N / mm ² is reduced by about 30% when viewed from the point A before the repair, and the stress decreases as a whole. Yes.

Further, since the reinforcing members 13 and 13 are attached to both side surfaces of the U rib 5 located between the lateral ribs 7 over substantially the entire length in the longitudinal direction, the function of the U rib 5 that supports the deck plate 3 is impaired. It can prevent that bending rigidity and torsional rigidity fall.
Further, the reinforcing member 13 is disposed outside the side surface of the U rib 5, and no elements other than the minimum necessary members such as bolts are disposed inside the U rib 5, so that a space is left in the U rib 5. Yes. For this reason, inspection using a flaw detector or the like can be easily performed during use after completion of construction.

  Further, since the joint portion between the U rib 5 and the lower surface of the deck plate 3 is welded from the inside of the U rib, the undissolved root portion disappears and the throat thickness N of welding increases. For this reason, the fatigue strength of a junction part can be improved.

  Furthermore, since the reinforcing members 13 and 13 are continuously provided over the entire length of the U rib 5 by the L-shaped member 15 and the lateral rib 7, the reinforcing effect on the U rib 5 can be enhanced.

  Further, since the reinforcing members 13 and 13 and the opening hole 17 are provided only in the U-rib 5 positioned below the portion where the load of the vehicle traveling on the traveling path 11 acts, the reinforcing members 13 and 13 and the opening hole 17 are positioned at other light load portions. The reinforcing members 13 and 13 and the opening hole 17 are omitted from the U rib 5. For this reason, the repair work can be performed with the minimum man-hour and material cost.

In addition, in this embodiment, although the reinforcement member 13 is attached only to the outer side of the U rib 5, when intensity | strength is insufficient with this, you may attach to the inner side in addition to the outer side.
In this case, the reinforcing member 13 attached to the inside is preferably a flat plate so as not to hinder the internal inspection of the U rib 5.

[Second Embodiment]
Next, 2nd embodiment of this invention is described using FIGS. 9-11.
In the present embodiment, the configuration of the open hole 17 is different from that of the first embodiment, and the connection structure of the reinforcing members 13 is different accordingly. Therefore, in this embodiment, this difference is demonstrated and the overlapping description is abbreviate | omitted about another part.
In addition, the same code | symbol is attached | subjected to the component same as 1st embodiment, and the detailed description is abbreviate | omitted.
9 to 11 show the U-rib 5 in the vicinity of the lateral rib 7. FIG. 9 is a transverse sectional view, FIG. 10 is a side view, and FIG. 11 is a bottom view.

In the present embodiment, the open hole 18 is provided on the lower surface of the U rib 7 over its entire length.
The ends of the reinforcing members 13 adjacent to each other in the longitudinal direction are connected to each other by an attachment plate (second connecting member) 23 made of flat steel.
The attachment plate 23 is located inside the U rib 5 and is connected to the reinforcing members 13 and 13 by bolts via the U rib 5.
Thereby, since the reinforcing members 13 and 13 adjacent to each other in the longitudinal direction are integrally formed by the attachment plate 23 and the U rib 5, the reinforcing structure is continuously formed over the entire length of the U rib 5. Become.
In the case where the reinforcing members 13 can provide sufficient strength, the attachment plate 23 can be omitted.

A repair method for repairing the U rib 5 in the steel deck 1 described above will be described.
Since the reinforcement members 13 and 13 are attached in the same manner as in the first embodiment, a duplicate description is omitted.
Next, the open hole 17 is opened over the entire length of the lower surface of the U-rib 5 by, for example, gas cutting.
As described above, since the opening 18 is performed after the reinforcing members 13 and 13 are attached, the U-rib 5 is first reinforced by the reinforcing members 13 and 13. For this reason, even if the vehicle load is applied, it is possible to prevent the U-rib 5 from yielding, buckling and the like due to the strength reduction caused by the processing of the opening hole 18, so that the repair work can be performed without stopping the traffic on the travel path 11. It can be carried out.

Thereafter, the attachment plate 23 is brought from the opening hole 18, and the ends of the reinforcing members 13 are connected to each other by the attachment plate 23.
And a welding apparatus is inserted from the open hole 18, and the junction part of the U rib 5 and the deck plate 3 located inside is welded.
In addition, this welding may be partially constructed as necessary in view of the state of the joint portion, or may not be performed if not necessary.

Next, the action and effect of the steel deck 1 according to this embodiment will be described.
In the present embodiment, in addition to the operations and effects of the first embodiment described above, the adjacent reinforcing members 13 and 13 are connected to each other by one attachment plate 23, so that the two L-shaped members 15 are connected. Compared to the first embodiment, there is an effect that the connecting man-hour is substantially halved.

In the present embodiment, the open hole 18 is provided over the entire length of the lower surface of the U-rib 5, but as shown in FIG. 12, the same effect can be obtained as the open hole 17 shown in the first embodiment. Can be played.
Further, the L-shaped member 15 of the first embodiment may be used for the connection of the reinforcing member 13 instead of the attachment plate 23.

It is a perspective view showing the schematic structure of the steel deck according to the first embodiment of the present invention. It is a cross-sectional view which shows a part of deck plate part of 1st embodiment of this invention. It is XX sectional drawing of FIG. FIG. 3 is a Y view of FIG. 2. FIG. 3 is a Y view of FIG. 2 showing a state in the initial stage of construction. It is a cross-sectional view which shows the U rib of the horizontal rib vicinity concerning 1st embodiment of this invention. It is a side view which shows the U rib of the horizontal rib vicinity concerning 1st embodiment of this invention. It is a bottom view which shows the U rib of the horizontal rib vicinity concerning 1st embodiment of this invention. It is a cross-sectional view which expands and shows a part of FIG. It is a figure which shows the state of the stress concerning the U rib analyzed by FEM. It is a cross-sectional view showing a U-rib in the vicinity of the horizontal rib according to the second embodiment of the present invention. It is a side view which shows the U rib of the horizontal rib vicinity concerning 2nd embodiment of this invention. It is a bottom view which shows the U rib of the horizontal rib vicinity concerning 2nd embodiment of this invention. It is a side view which shows the U rib of the horizontal rib vicinity concerning another embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Steel deck 3 Deck plate 5 U rib 7 Lateral rib 11 Running path 13 Reinforcement member 15 L-shaped members 17, 18 Open hole 23 Additional plate

Claims (11)

A plurality of vertical ribs forming a closed cross section extending in the longitudinal direction are provided on the lower surface of the deck plate constituting the floor slab of the traveling path in the width direction, and spaced in the longitudinal direction, respectively in the width direction. In a steel slab provided with a plurality of lateral ribs extended,
Reinforcing members attached to the side surfaces of the vertical ribs located between the horizontal ribs over substantially the entire length in the longitudinal direction;
An open hole provided on the lower surface of the vertical rib located between the lateral ribs and extending in the longitudinal direction and having a length substantially equal to at least the reinforcing member;
A steel floor slab characterized by comprising:   The steel deck according to claim 1, wherein a joint portion between the vertical rib and the lower surface of the deck plate is welded from the inside of the vertical rib.   The joints between the vertical ribs and the lower surface of the deck plate have a smooth finish on the toe ends of the existing welds outside the vertical ribs and the welds from the inside of the vertical ribs. The steel deck according to claim 2.   4. The steel slab according to claim 1, wherein the reinforcing member is disposed outside the side surface of the vertical rib and leaves a space inside the vertical rib. 5.   The steel deck according to any one of claims 1 to 4, further comprising a first connecting member that connects an end of the reinforcing member and the lateral rib.   The steel deck according to any one of claims 1 to 5, further comprising a second connecting member that connects between the ends of the adjacent reinforcing members inside the longitudinal rib. A plurality of vertical ribs forming a closed cross section extending in the longitudinal direction are provided on the lower surface of the deck plate constituting the floor slab of the traveling path in the width direction, and spaced in the longitudinal direction, respectively in the width direction. In a method for repairing a steel deck having a plurality of extending lateral ribs,
A reinforcing member attaching step for attaching a reinforcing member to the side surface of the vertical rib located between the lateral ribs over substantially the entire length in the longitudinal direction;
A hole machining step in which an open hole extending in a longitudinal direction is provided on a lower surface of the vertical rib located between the horizontal ribs over a length substantially equal to the length of the reinforcing member;
A method for repairing a steel floor slab characterized by comprising: The method for repairing a steel slab according to claim 7 , wherein after the drilling step, a joint portion between the vertical rib and the lower surface of the deck plate is welded from the inside of the vertical rib. The method for repairing a steel slab according to claim 7 or 8 , wherein after the reinforcing member attaching step, the end portion of the reinforcing material and the lateral rib are connected by a first connecting member. The method for repairing a steel deck according to any one of claims 7 to 9 , wherein the reinforcing member attaching step is performed prior to the hole drilling step. After the hole formation step, between the ends of the reinforcing member adjacent to, according to claims 7, characterized in that the connection inside of the longitudinal ribs by a second connecting member to claim 1 0 How to repair steel slabs.

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