JP2017150289A - Reinforcement/repair structure and method for steel structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reinforcement/repair structure and method for a steel structure in which reinforcement/repairing operation onto a crack generation site may be simply carried out without removal of such as concrete floor plate and pavement, and without restriction or stop of traffic.SOLUTION: A reinforcement/repair structure for a steel structure comprises a main beam upper flange 21 onto which load is added repeatedly, a main beam web jointed with the main beam upper flange 21, and a reinforcing member 26. The reinforcing member 26 comprises a contact supporting part 28 arranged on lower surface of the main beam upper flange 21 and an attachment part 29 which is successive to the contact supporting part 28 and extends along the main beam web. The attachment part 29 of the reinforcing member 26 is fastened onto the main beam web with a bolt while keeping a state where the contact supporting part 28 is pressed and contacts to the lower surface of the main beam upper flange 21, thereby at least one part of repeated load added to a joint part of the main beam upper flange 21 and vertical reinforcing material 10 is received by a reinforcing member so that the joint part is reinforced.SELECTED DRAWING: Figure 1

Description

  The present invention relates to repairing the joint of a main girder upper flange (hereinafter sometimes referred to as "main girder upper flange") and a web gap plate or a vertical stiffener in a steel structure such as a steel bridge. The present invention relates to a steel structure reinforcement / repair structure and method that can be suitably implemented.

  A web gap plate is provided in an engagement portion, which is also called a web gap portion between a main girder upper flange and a cross girder upper flange of a steel bridge, for example. The main girder is arranged in parallel to the bridge axis, and the horizontal girder is arranged perpendicular to the bridge axis. The web gap plate is joined by welding to the main girder upper flange and the cross girder upper flange.

  A welded portion between the web gap plate and the main girder upper flange, a welded portion between the web gap plate and the main girder web, a web gap plate and a top girder upper flange (hereinafter, abbreviated as “horizontal girder upper flange”). ) And the base material of the web gap plate, cracks may occur due to the effects of repeated loading over many years. Appropriate reinforcement and repair are required for these cracks.

  Since these cracks are narrow places where the main girder and the distribution girder or anti-tilt cross, they are conventionally supported by the upper flange of the main girder in order to reinforce and repair the cracked part. The concrete floor slab and the pavement work on the concrete floor slab are removed as narrow as possible, and the cracks are reinforced and repaired from the opening formed by the removal (for example, Patent Document 1). reference).

JP 2011-242362 A

  In the above prior art, concrete floor slabs and pavements are removed in order to reinforce and repair cracked parts, so it is necessary to restore the removed part after reinforcement and repair work is completed. There is a problem that traffic must be restricted or stopped during the construction period.

  An object of the present invention is to provide a steel structure reinforcement / repair structure that can easily perform reinforcement / repair work at a crack occurrence location without removing concrete floor slabs and pavements, without restricting or stopping traffic. And to provide a method.

The steel structure reinforcement / repair structure of the present invention is:
(A) a first member on which a repeated load acts;
(B) a second member that is bonded to the first member at the bonding portion and supports the first member;
(C) a reinforcing member,
A contact support portion disposed on a surface of the first member facing the second member;
A reinforcing member that includes an attachment portion that extends along the second member and is connected to the contact support portion;
(D) A repetitive load acting on the joint portion by fixing the attachment portion of the reinforcing member to the second member while keeping the abutting support portion pressed against the surface of the first member and keeping the abutting state. And a fixing member that receives at least a part of the steel structure with a reinforcing member.

The present invention also provides
The reinforcing member is configured by bending and contacting the abutting support portion and the attachment portion,
Having a tapping bolt having a bolt head and a bolt shaft connected to the bolt head;
The tapping bolt is screwed directly into a pilot hole that is not subjected to female threading of the first member by inserting a loose hole in the bolt shaft portion formed in the abutting support portion of the reinforcing member, It is characterized by proceeding while threading itself, forming a female thread by plastic deformation, tightening the first member and the abutting support portion, and abutting and screw joining.

The present invention also provides
The reinforcing member is formed by bending and contacting the contact support portion and the second member,
A bolt having a bolt head and a bolt shaft connected to the bolt head;
In this bolt, the bolt shaft portion is inserted through a through hole formed in the abutting support portion of the reinforcing member, and is screwed into a screw hole in which the female screw processing of the first member is performed. And the abutting support portion are tightened and abutted to be screw-joined.

The present invention also provides
The fixing member is characterized in that the second member and the attachment portion are fixed by bolt joining or rivet joining.

The present invention also provides
The steel structure is a steel bridge,
The first member is a main girder upper flange,
The second member is a web gap plate attached to the main girder upper flange, the main girder web, and the cross girder upper flange.

The present invention also provides
The steel structure is a steel bridge,
The first member is a main girder upper flange,
The second member is a vertical stiffener attached to the main girder upper flange, the main girder web, and the main girder lower flange.

The present invention also provides
The vertical stiffener is characterized in that an anti-tilt structure is joined via a gusset.

The method for reinforcing and repairing a steel structure according to the present invention is as follows.
In a method for reinforcing / repairing a steel structure having a first member on which a repeated load acts and a second member joined to the first member at a joint and supporting the first member,
(A) a preparation step of preparing a reinforcing member,
The reinforcing member
A contact support portion disposed on a surface of the first member facing the second member;
A reinforcing member preparing step having an attachment portion that extends along the second member and is connected to the contact support portion;
(B) a pressing step of pressing and contacting the contact support portion against the surface of the first member;
(C) The attachment portion of the reinforcing member is fixed to the second member while keeping the state of being pressed and abutted by the pressing step, whereby at least a part of the repeated load acting on the joint portion is received by the reinforcing member. A steel structure reinforcing and repairing method comprising a fixing step.

The present invention also provides
The reinforcing member is configured by bending and contacting the abutting support portion and the attachment portion,
Including a tapping bolt preparation step of preparing a tapping bolt having a bolt head and a bolt shaft portion connected to the bolt head;
In the pressing step, the bolt shaft portion of the tapping bolt is inserted through the free hole formed in the abutting support portion of the reinforcing member and directly screwed into the pilot hole of the first member not subjected to female threading. Thus, it is characterized by proceeding while threading itself, forming a female screw by plastic deformation, and tightening and abutting the first member and the abutting support portion to screw-join.

The present invention also provides
The reinforcing member is configured by bending and contacting the abutting support portion and the attachment portion,
Including a bolt preparation step of preparing a bolt having a bolt head and a bolt shaft connected to the bolt head;
In the pressing step, the bolt shaft portion is inserted into the through hole formed in the contact support portion of the reinforcing member and screwed into the screw hole in which the female threading of the first member is performed, so that the first member And the abutting support portion are tightened and abutted to be screw-joined.

The present invention also provides
Including a pressing device preparation step of preparing a pressing device that presses and contacts the contact support portion against the surface of the first member and receives the reaction force by the second member;
In the pressing step, the pressing support device presses the contact support portion against the surface of the first member to make contact.

  According to the steel structure reinforcement / repair structure of the present invention, the reinforcement member is connected to the contact support portion disposed on the surface of the first member facing the second member, and the contact support portion, and is connected to the second member. And an attachment portion extending along. In this reinforcing member, the abutment support portion is pressed against the surface of the first member facing the second member by the fixing member, and in this state, the attachment portion is fixed to the second member, and the first member and the first member Since the reinforcing member is configured to load at least part of the repeated load acting on the joint portion with the two members, the reinforcing member can be easily attached to the first member and the second member using the fixing member, and the joint portion It is possible to prevent the development of cracks and to reinforce and repair cracks.

  The mounting operation of such a reinforcing member may be performed by pressing the abutting support portion of the reinforcing member against the surface of the first member so that the mounting portion is fixed to the second member by the fixing member. It can be performed from the side where the reinforcing member is attached to the first member and the second member. As in the prior art, the first member is a main beam and the second member is a vertical stiffener or a web gap plate. Sometimes, it is not necessary to remove a floor set such as a concrete floor slab or a pavement, and the reinforcing member can be attached in a space below the floor set. Therefore, the reinforcement / repair work of the crack occurrence location can be performed without restricting or stopping the traffic of the vehicle or the pedestrian.

  According to the present invention, the reinforcing member has a structure in which the contact support portion and the attachment portion are bent and connected, and the contact support portion has a through hole, and the first member has a pilot hole. Therefore, with the reinforcing member positioned in the first member so that the through hole is disposed on the pilot hole, the bolt shaft portion of the tapping bolt is inserted into the through hole, and the tapping bolt is By tightening, the contact support portion of the reinforcing member is screwed to the first member. Accordingly, the contact support portion of the reinforcement member can be pressed against the surface of the first member facing the second member, and the attachment work of the reinforcement member to the first member can be simplified and easy. And the efficiency of the installation work can be improved.

  According to the invention, the reinforcing member has a configuration in which the contact support portion and the second member are bent and connected, and the contact support portion has a through hole, and the first member has a screw. Since the hole is formed, the bolt shaft portion of the bolt is inserted into the through hole and the bolt is tightened with the reinforcing member positioned on the first member so that the through hole is arranged on the screw hole. Thus, the contact support portion of the reinforcing member is screwed to the first member. Accordingly, the contact support portion of the reinforcement member can be pressed against the surface of the first member facing the second member, and the attachment work of the reinforcement member to the first member can be simplified and easy. And the efficiency of the installation work can be improved.

  Further, according to the present invention, the fixing member is configured such that the second member and the attachment portion of the reinforcing member are bolt-bonded or rivet-bonded, so that the contact support portion faces the second member of the first member. The attachment portion of the reinforcing member pressed against and abutted on the second member can be easily and quickly joined to the second member, and the efficiency of the attaching operation of the reinforcing member to the second member can be improved.

  Further, according to the present invention, since the reinforcing member is joined to the main girder upper flange and the web gap plate of the steel bridge, the joint portion between the main girder upper flange and the web gap plate can be reinforced and repaired.

  Further, according to the present invention, since the reinforcing member is joined to the main girder upper flange and the vertical stiffener of the steel bridge, the joint between the main girder upper flange and the vertical stiffener can be reinforced and repaired. it can.

  Further, according to the present invention, since the anti-tilt structure is joined to the vertical stiffener via the gusset, at least part of the load acting on the vertical stiffener and the web gap plate from the main girder upper flange is also used as the reinforcing member. Thus, reliable load distribution can be performed and generation of excessive stress can be prevented.

  According to the method for reinforcing / repairing a steel structure according to the present invention, in the preparation step, the contact support portion disposed on the surface of the first member facing the second member and the contact support portion are connected to the second member. A reinforcing member having a mounting portion extending along the surface is prepared. In the pressing step, the prepared reinforcing member is pressed against the surface of the first member facing the second member of the first member, and comes into contact with the first supporting member. The attachment portion is fixed to the second member while maintaining the state of being pressed against and contacted with the surface, so that at least a part of the repetitive load acting on the joint portion between the first member and the second member is loaded. In addition, a reinforcing member is attached to the first member and the second member, so that the progress of cracks in the joint portion can be prevented, and the crack occurrence location can be reinforced and repaired.

  The mounting operation of such a reinforcing member may be performed by pressing the abutting support portion of the reinforcing member against the surface of the first member so that the mounting portion is fixed to the second member by the fixing member. It can be performed from the side where the reinforcing member is attached to the first member and the second member. As in the prior art, the first member is a main beam and the second member is a vertical stiffener or a web gap plate. Sometimes, it is not necessary to remove a floor set such as a concrete floor slab or a pavement, and the reinforcing member can be attached in a space below the floor set. Therefore, the reinforcement / repair work of the crack occurrence location can be performed without restricting or stopping the traffic of the vehicle or the pedestrian.

  According to the present invention, the tapping bolt is prepared in the preparation step, and the reinforcing member is positioned on the first member so that the through hole is disposed on the prepared hole in the pressing step. By inserting the bolt shaft portion into the free hole and tightening the tapping bolt, the contact support portion of the reinforcing member is screwed to the first member. Accordingly, the contact support portion of the reinforcement member can be pressed against the surface of the first member facing the second member, and the attachment work of the reinforcement member to the first member can be simplified and easy. And the efficiency of the installation work can be improved.

  According to the invention, the bolt shaft of the bolt is prepared in a state where the reinforcing member is positioned on the first member so that the bolt is prepared in the preparation step and the loose hole is arranged on the screw hole in the pressing step. By inserting the portion into the free hole and tightening the bolt, the contact support portion of the reinforcing member is screwed to the first member. Accordingly, the contact support portion of the reinforcement member can be pressed against the surface of the first member facing the second member, and the attachment work of the reinforcement member to the first member can be simplified and easy. And the efficiency of the installation work can be improved.

  According to the invention, in the preparation step, a pressing device is prepared, and in the pressing step, the attachment portion of the reinforcing member that is in contact with the contact support portion pressed against the surface of the first member facing the second member, It can be easily and quickly joined to the second member, and the efficiency of attaching the reinforcing member to the second member can be improved.

It is a perspective view which shows the reinforcement and repair structure of the steel structure of the actual form of this invention. It is a one part perspective view of the bridge deck structure 1 of a steel girder bridge. It is the expanded sectional view which looked at the main girder upper flange 21 vicinity in the bridge axis L1 direction. It is an expansion perspective view of the vertical stiffener 10 vicinity. 4 is a flowchart showing a reinforcement / repair procedure when a fatigue crack occurs in a joint portion between an upper end portion of a vertical stiffener 10 and a main girder upper flange 21; 2 is a cross-sectional view showing a state in which a reinforcing member 26 is attached to an upper end portion of a vertical stiffener 10. FIG. FIG. 3 is a cross-sectional view showing a state where the pressing device 30 is attached to the vertical stiffener 10. 3 is an enlarged cross-sectional view of a pressing device 30. It is an expanded sectional view near existing bolt insertion holes 37a, 37b, 37c; 38a, 38b, 38c formed in the vertical stiffener 10 and the gusset 20. FIG. 3 is a partial cross-sectional view in the vicinity of a vertical stiffener 10. FIG. 3 is a perspective view of a part near the vertical stiffener 10. It is sectional drawing which shows the reinforcement and repair structure of the steel structure of other embodiment of this invention. It is sectional drawing seen from the right side of FIG. 5 is a flowchart showing a reinforcement / repair procedure when a fatigue crack is generated at the upper end of the web gap plate 9. FIG. 4 is a partial cross-sectional view in the vicinity of a web gap portion. It is a one part perspective view of the web gap part vicinity.

  FIG. 1 is a perspective view showing a steel structure reinforcement / repair structure according to one embodiment of the present invention, and FIG. 2 is a perspective view of a part of a bridge deck structure 1 of a steel girder bridge. FIG. 1 shows a section I of FIG. 2 in an enlarged manner, and FIG. 2 is shown partially cut away for ease of illustration. The steel structure reinforcement / repair structure of this embodiment will be described below as being constructed by carrying out the structure reinforcement / repair method of the present invention. The steel girder bridge deck structure 1 which is a steel structure is provided with a plurality of main girders 2 extending in the direction of the bridge axis L1 and perpendicular to each main girder 2 and spaced from each other in the direction of the bridge axis L1. A plurality of distribution cross beams (hereinafter abbreviated as “horizontal beams”) 3 and a plurality of counter-tilt structures 4 disposed between the cross beams 3 at intervals in the direction of the bridge axis L1. A concrete floor slab 5 is laid on each main girder 2, a waterproof sheet 6 is laid on the surface facing the concrete floor slab 5, and a pavement 7 is laid on the waterproof sheet 6 by asphalt or the like. .

  The main girder 2 includes a main girder upper flange 21 as a first member, a main girder lower flange 22, and a main girder web 23 that connects the main girder upper flange 21 and the main girder lower flange 22. The main girder 2 is made of, for example, a structural steel material having an I-shaped cross section. The cross beam 3 includes a cross beam upper flange 31, a cross beam lower flange 32, and a cross beam web 33 that connects the cross beam upper flange 31 and the cross beam lower flange 32. The cross beam 3 is made of a structural steel material having an I-shaped cross section similar to the main beam 2 described above.

  A web gap plate 9 as a second member is provided between the main girder upper flange 21 and the horizontal girder upper flange 31, and a second member is disposed between the main girder upper flange 21 and the main girder lower flange 22. A vertical stiffener 10 is provided. The upper end of the web gap plate 9 and the main girder upper flange 21 are joined by welding to form a bead 11 made of weld metal, and the lower end of the web gap plate 9 and the cross girder upper flange 31 form a bead 12. One end of the web gap plate 9 and the main girder web 23 are joined by welding to form a bead 13.

  3 is an enlarged cross-sectional view of the vicinity of the main girder upper flange 21 in the direction of the bridge axis L1, and FIG. 4 is an enlarged perspective view of the vicinity of the vertical stiffener 10. The upper end of the vertical stiffener 10 and the main girder upper flange 21 are joined by welding to form a bead 14 made of weld metal, and the lower end of the vertical stiffener 10 and the lower main girder flange 22 are joined to the bead 15. The one end of the vertical stiffener 10 and the main girder web 23 are joined by welding to form the bead 16.

  At the upper end of the vertical stiffener 10, first to third bolts 17 to 19 and first to third nuts 17a to 19a that are screwed to the first to third bolts 17 to 19 as fixing members, The gusset 20 is fixed, and an anti-tilt 25 is joined to the gusset 20 by welding. High tension bolts are used for the first to third bolts 17 to 19, and high tension nuts are used for the first to third nuts 17a to 19a.

  FIG. 5 is a flowchart showing a reinforcing / repairing procedure when a fatigue crack occurs at the joint between the upper end portion of the vertical stiffener 10 and the main girder upper flange 21, and FIG. 3 is a cross-sectional view showing a state where the upper end of the material 10 is attached. FIG. First, reinforcement / repair work is started in step s0, and two reinforcing members 26 are used for one reinforcing portion, and the reinforcing members 26 corresponding to the number of reinforcing portions are prepared. The reinforcing member 26 includes a contact support portion 28 that is disposed in a state in which the main member upper flange 21 that is the first member is in contact with the lower surface 27 that faces the main beam web 23 that is the second member, It has an attachment portion 29 that is continuous with the contact support portion 28 and extends along the main girder web 23. In the present embodiment, the reinforcing member 26 is made of a trapezoidal structural steel plate when viewed from the front, which is a direction perpendicular to the paper surface of FIG. 6, with the hypotenuse on the upper side and the tip portion away from the main girder web 23. It is arranged. The abutting support portion 28 is configured by such a tip portion and the vicinity thereof. Reinforcing members 26 are disposed on both sides of the main girder web 23 and the gusset 20 via filler plates 36, and the first to third nuts 17a to 19a are screwed to the first to third bolts 17 to 19, respectively. By tightening, the main girder web 23, the gusset 20 and the filler plates 36 are frictionally joined between the attachment portions 29 of the reinforcing members 26.

  When such a reinforcing member 26 is prepared in step s0, a pilot hole 35 for attaching a pressing device 30 shown in FIGS. 7 and 8 to be described later is formed in the vertical stiffener 10 in step s1. If the pilot hole 35 is formed, it will move to step s2 and the existing bolt which has fixed the vertical stiffener 10 and the gusset 20 will be removed.

  FIG. 7 is a cross-sectional view showing a state in which the pressing device 30 is attached to the vertical stiffener 10, and FIG. 8 is an enlarged cross-sectional view of the pressing device 30. FIG. 9 is an enlarged cross-sectional view in the vicinity of existing bolt insertion holes 37a, 37b, 37c; 38a, 38b, 38c formed in the vertical stiffener 10 and the gusset 20. The vertical stiffener 10 and the gusset 20 are formed with bolt insertion holes 37a, 37b, 37c; 38a, 38b, 38c through which the bolt shaft portions of three existing bolts are inserted. The inner diameter D1 of these existing bolt insertion holes 37a, 37b, 37c; 38a, 38b, 38c is, for example, φ24.5 mm.

  Next, in step s3, the reinforcing member 26 and the filler plate 36 are attached to the vertical stiffener 10 and the gusset 20 and temporarily fixed by the upper first bolt 17 and nut 17a and the lower third bolt 19 and nut 19a.

  Bolt shaft portions of the first to third bolts 17 to 19 are inserted into the reinforcing member 26 and the filler plate 36 at the same intervals corresponding to the existing bolt insertion holes 37a, 37b, and 37c; 38a, 38b, and 38c. Bolt insertion holes 39a to 39c and 40a to 40c are formed respectively. The inner diameter D2 of these bolt insertion holes 39a to 39c is selected to be larger than the inner diameter D1 of the existing bolt insertion holes 37a to 37c, 38a to 38c, for example, S2 = 26.5 mm. Further, the inner diameter D3 of the bolt insertion holes 40a to 40c of the filler plate 36 is selected to be the same as the inner diameter D1 of the existing bolt insertion holes 37a to 37c, 38a to 38c (D3 = D1).

  When the reinforcing member 26 is attached to the vertical stiffener 10 and the gusset 20 together with the filler plate 36 so as to sandwich them, the uppermost portions 39a1 to 39c1 of the inner peripheral surface defining the bolt insertion holes 39a to 39c are formed. The uppermost part of the inner peripheral surface that defines the bolt insertion holes 37a to 37c of the vertical stiffener 10 and the uppermost part of the inner peripheral surface that defines the bolt insertion holes 38a to 38c of the gusset 20 and the bolt insertion hole 40a of the filler plate 36. It attaches so that it may protrude below rather than the uppermost part of the internal peripheral surface which defines -40c.

  Proceeding to step s4, the reinforcing member 26 is attached to the vertical stiffener 10 and the gusset 20 by the upper and lower bolts 17, 19 and the nuts 17a, 19a, and the middle bolt insertion holes 37b, 38b, 39b, 40b. The pressing device 30 is attached using the pilot hole 35.

  The pressing device 30 is mounted with width adjusting holders 42a and 42b at both ends in the axial direction where the external threads of the connecting bolt 41 are engraved, and fixed and positioned by a pair of nuts 43a and 43b. Each of the width adjusting holders 42a and 42b rotatably holds one end of the screw rods 44a and 44b in the axial direction. Movable members 45a and 45b are screwed to the screw rods 44a and 44b, and both axial ends of another connecting bolt 46 are screwed to the movable members 45a and 45b and connected to each other. At the other end in the axial direction of each screw rod 44a, 44b, through holes 47a, 47b penetrating in the diameter direction are formed, and an operation tool such as a lever is inserted into these through holes 47a, 47b for rotation operation. As a result, the movable members 45a and 45b move in the axial direction of the screw rods 44a and 44b, and the lower connecting bolt 46 is inserted through the lower hole 35 of the vertical stiffener 10 to define the lower hole 35. The uppermost portions 39a1 to 39c1 of the reinforcing members 26 are pushed up by the upper connecting bolts 41 while being supported at the lowermost portion of the peripheral surface. In step s 5, the abutting support portion 28, which is the upper end portion of each reinforcing member 26, is brought into contact with the lower surface 27 of the main girder upper flange 21 so as to be pushed up, and the vertical stiffener 10 is removed from the main girder upper flange 21. A reaction force is applied in the direction of separating downward, thereby prestressing the vertical stiffener 10.

  Thereafter, in step s6, the upper and lower first and third bolts 17, 19 and nuts 17a, 19a are finally tightened. In step s7, the pressing device 30 is removed, and in step s8, the middle second bolt 18 and nut 18a. Install and tighten.

  Thus, as shown in the cross-sectional view of FIG. 10 and the perspective view of FIG. 11, the development of cracks 48 and 49 generated from the weld near the intersection between the vertical stiffener 10 and the main girder upper flange 21. Thus, prestress is applied to the vertical stiffener 10 so that the reinforcement / repair operation is completed in step s9. By carrying out such a reinforcement / repair method, the steel structure reinforcement / repair structure according to the present invention is realized, and the prestress applied to the vertical stiffener 10 and the stress due to the overload are offset, The stress at the site where the cracks 48 and 49 are generated is reduced, the progress of the cracks 48 and 49 is prevented, the generation of new cracks is prevented, and the site where the cracks 48 and 49 are generated and the vicinity thereof are reinforced. be able to.

  FIG. 12 is a cross-sectional view showing a steel structure reinforcement / repair structure according to another embodiment of the present invention, and FIG. 13 is a cross-sectional view seen from the right side of FIG. In the present embodiment, a reinforcing and repairing structure and method for the web gap plate 9 will be described. Note that the same reference numerals are given to portions corresponding to the above-described embodiment.

  The reinforcing member 26a of the present embodiment includes a contact support portion 28a disposed on the lower surface of the main girder upper flange 21 facing the web gap plate 9, and an attachment that extends along the web gap plate 9 and continues to the contact support portion 28a. Part 29a. The reinforcing member 26 a is a short material made of angle steel having an L-shaped cross section, and the contact support portion 28 a faces the web gap plate 9 of the main girder upper flange 21 by the first and second bolts 17 and 18. In this state, the attachment portion 29a is fixed to the web gap plate 9 by friction bonding, and at least one of the repeated loads acting on the joint portion between the main girder upper flange 21 and the web gap plate 9 is pressed. It is comprised so that the reinforcement member 26a may load a part. Accordingly, the reinforcing member 26a can be easily attached to the main girder upper flange 21 and the web gap plate 9 using the bolts 17 and 18, and the progress of cracks in the joint portion can be prevented, and the crack occurrence point can be reinforced and repaired.

  Such a mounting operation of the reinforcing member 26a is performed by bringing the abutting support portion 28a of the reinforcing member 26a into contact with the lower surface 27 of the main girder upper flange 21 and contacting the mounting portion 29a with the bolts 17 and 18. Since it only has to be fixed to the gap plate 9, it can be carried out from the side where the reinforcing member 26 is attached to the main girder upper flange 21 and the vertical stiffener 10. It is not necessary to remove the pavement or the pavement, and the reinforcing member 26a can be attached in the space below the floor assembly. Therefore, the reinforcement / repair work of the crack occurrence location can be performed without restricting or stopping the traffic of the vehicle or the pedestrian.

  Further, the reinforcing member 26a has a configuration in which the contact support portion 28a and the attachment portion 29a are bent and connected, and the contact support portion 28a is provided with a pilot hole 51 that is a free hole, so Since the flange 21 is formed with a pilot hole 50 having a smaller diameter than the pilot hole 51, the reinforcing member 26 a is arranged such that the pilot hole 50 of the main girder upper flange 21 is disposed on the pilot hole 51 of the contact support portion 28 a. Is positioned on the main girder upper flange 21, the bolt shaft portion of the tapping bolt 54 is inserted into the prepared hole 51, and the tapping bolt 54 is tightened, whereby the abutment support portion 28 a of the reinforcing member 26 a is attached to the main girder upper flange 21. Then, the attachment portion 29 a is frictionally joined to the web gap plate 9 via the filler plate 36 by the bolts 17 and 18. As a result, the contact support portion 28a of the reinforcing member 26a is pressed against the lower surface 27 of the main girder upper flange 21, and the contact support portion 28a is tightened with the tapping bolt 54 as in the above-described embodiment. As a result, it is possible to apply prestress to the web gap plate 9, simplify and facilitate the work of attaching the reinforcing member 26a to the main girder upper flange 21, and improve the efficiency of the work.

  As the tapping bolt, a thread rolling screw (abbreviation: TRS (registered trademark)) can be preferably used. This thread rolling screw is screwed directly into a pilot hole that is not subjected to female threading in at least one of a plurality of members to be joined. Including a bolt or a screw to be screw-bonded, and a bolt or screw to be screw-bonded and advanced by cutting the screw by itself and formed by elastic deformation of the base material or by cutting. Furthermore, a so-called thread forming screw, a tapping screw and a tap bolt are included.

  Further, the web gap plate 9 and the attachment portion 29a of the reinforcing member 26 may be rivet joined. Even in this case, the attachment portion 29a of the reinforcing member 26a, which is in contact with the contact support portion 28a pressed against the lower surface 27 of the main girder upper flange 21, can be easily and quickly joined to the web gap plate 0. And the efficiency of the attachment operation | work to the web gap board 9 of the reinforcement member 26a can be improved.

  The mounting operation of the reinforcing member 26a is performed by pressing the abutting support portion 28a of the reinforcing member 26a against the lower surface 27 of the main girder upper flange 21 and bringing the mounting portion 29a into the web gap with the bolts 17 and 18. Since it only has to be fixed to the plate 9, the work can be performed from the side where the reinforcing member 26a is attached to the main girder upper flange 21 and the web gap plate 9, and the floor assembly such as a concrete floor slab as in the prior art. It is not necessary to remove the pavement or the pavement, and the reinforcing member 26a can be attached in the space below the floor assembly. Therefore, the reinforcement / repair work of the crack occurrence location can be performed without restricting or stopping the traffic of the vehicle or the pedestrian.

  FIG. 14 is a flowchart showing a reinforcement / repair procedure when a fatigue crack occurs at the upper end of the web gap plate 9. In step s20, a work for reinforcing / repairing a crack occurring at the joint portion of the web gap plate 9 is started. In step s21, the existing upper and middle bolts 17, 18 and nuts 17a, 18a are removed. .

  Proceeding to step s22, pilot holes 50 and 51 are formed in the abutment support portion 28a of the main girder upper flange 21 and the reinforcing member 26a. In step s23, the reinforcing member 26a is placed on the web gap plate 9 together with the filler plate 36. And, the first and second bolts 17 and 18 and the nuts 17a and 18b in the middle stage are temporarily fixed.

  Next, in step s24, the tapping bolt 54 is tightened, and the contact support portion 28a of the reinforcing member 26a is fixed to the main girder upper flange 21. Next, in step s25, the upper and middle first and second bolts 17, 18 and nuts 17a, 18a are finally tightened.

  Thus, as shown in the cross-sectional view of FIG. 15 and the perspective view of FIG. 16, the web gap plate 9 is generated from the vicinity of the junction between the web gap plate 9 and the main girder web flange 21 and the junction with the main girder web 23. Prestress is applied to the web gap plate 9 so as to suppress the progress of the cracks 52 and 53, and the reinforcement / repair work is completed in step s26.

  Further, according to the present embodiment, the reinforcing member 26a is joined to the main girder upper flange 21 of the steel bridge and the web gap plate 9, thereby prestressing the web gap plate 9. The applied pre-stress and the stress due to the overload cancel each other, reducing the stress at the site where the cracks 52 and 53 are generated, preventing the cracks 52 and 53 from progressing, and preventing the generation of new cracks. The part where the cracks 52 and 53 are generated and the vicinity thereof can be reinforced and repaired.

DESCRIPTION OF SYMBOLS 1 Bridge deck structure 2 Main girder 3 Horizontal girder 4 Anti-tilting 5 Concrete floor slab 9 Web gap board 10 Vertical stiffener 17
17a, 17b Nut 18 Second bolt 19 Third bolt 20 Gusset 21 Main girder upper flange 22 Main girder lower flange 23 Main girder web 25 Tilt structure 26, 26a Reinforcement member 27 Lower surface 28, 28a Abutting support portion 29, 29a Mounting portion 30 Pressing device 31 Upper girder upper flange 35, 50, 51 Pilot hole 36 Filler plate

Claims (11)

(A) a first member on which a repeated load acts;
(B) a second member that is bonded to the first member at the bonding portion and supports the first member;
(C) a reinforcing member,
A contact support portion disposed on a surface of the first member facing the second member;
A reinforcing member that includes an attachment portion that extends along the second member and is connected to the contact support portion;
(D) A repetitive load acting on the joint portion by fixing the attachment portion of the reinforcing member to the second member while keeping the abutting support portion pressed against the surface of the first member and keeping the abutting state. And a fixing member that receives at least a part of the steel structure with a reinforcing member. The reinforcing member is configured by bending and contacting the abutting support portion and the attachment portion,
Having a tapping bolt having a bolt head and a bolt shaft connected to the bolt head;
The tapping bolt is screwed directly into a pilot hole that is not subjected to female threading of the first member by inserting a loose hole in the bolt shaft portion formed in the abutting support portion of the reinforcing member, The steel structure according to claim 1, wherein the steel structure is advanced by threading itself, a female screw is formed by plastic deformation, and the first member and the abutting support portion are tightened and abutted to be screw-joined. Reinforcement / repair structure. The reinforcing member is formed by bending and contacting the contact support portion and the second member,
A bolt having a bolt head and a bolt shaft connected to the bolt head;
In this bolt, the bolt shaft portion is inserted through a through hole formed in the abutting support portion of the reinforcing member, and is screwed into a screw hole in which the female screw processing of the first member is performed. The steel structure reinforcement / repair structure according to claim 1, wherein the abutment support portion is tightened and abutted to be screwed together.   4. The steel structure reinforcement / repair structure according to claim 2, wherein the fixing member fixes the second member and the attachment portion by bolt bonding or rivet bonding. The steel structure is a steel bridge,
The first member is a main girder upper flange,
5. The reinforcement of a steel structure according to claim 1, wherein the second member is a web gap plate attached to the main girder upper flange, the main girder web, and the cross girder upper flange.・ Repair structure. The steel structure is a steel bridge,
The first member is a main girder upper flange,
5. The steel structure according to claim 1, wherein the second member is a vertical stiffener attached to a main girder upper flange, a main girder web, and a main girder lower flange. Reinforcement / repair structure.   The structure for reinforcing / repairing a steel structure according to claim 6, wherein the vertical stiffener is joined to an anti-tilt structure via a gusset. In a method for reinforcing / repairing a steel structure having a first member on which a repeated load acts and a second member joined to the first member at a joint and supporting the first member,
(A) a preparation step of preparing a reinforcing member,
The reinforcing member
A contact support portion disposed on a surface of the first member facing the second member;
A reinforcing member preparing step having an attachment portion that extends along the second member and is connected to the contact support portion;
(B) a pressing step of pressing and contacting the contact support portion against the surface of the first member;
(C) The attachment portion of the reinforcing member is fixed to the second member while keeping the state of being pressed and abutted by the pressing step, whereby at least a part of the repeated load acting on the joint portion is received by the reinforcing member. A method for reinforcing and repairing a steel structure, comprising a fixing step. The reinforcing member is configured by bending and contacting the abutting support portion and the attachment portion,
Including a tapping bolt preparation step of preparing a tapping bolt having a bolt head and a bolt shaft portion connected to the bolt head;
In the pressing step, the bolt shaft portion of the tapping bolt is inserted through the free hole formed in the abutting support portion of the reinforcing member and directly screwed into the pilot hole of the first member not subjected to female threading. 9. The steel structure according to claim 8, wherein the steel structure advances by threading itself, the female screw is formed by plastic deformation, and the first member and the abutting support portion are tightened and abutted to be screw-joined. How to reinforce and repair things. The reinforcing member is configured by bending and contacting the abutting support portion and the attachment portion,
Including a bolt preparation step of preparing a bolt having a bolt head and a bolt shaft connected to the bolt head;
In the pressing step, the bolt shaft portion is inserted into the through hole formed in the contact support portion of the reinforcing member and screwed into the screw hole in which the female threading of the first member is performed, so that the first member The method for reinforcing and repairing a steel structure according to claim 8, wherein the abutment support portion is tightened and abutted to be screw-joined. Including a pressing device preparation step of preparing a pressing device that presses and contacts the contact support portion against the surface of the first member and receives the reaction force by the second member;
9. The method for reinforcing and repairing a steel structure according to claim 8, wherein, in the pressing step, the contact support portion is pressed against the surface of the first member by the pressing device.