JP2011219945A - Reinforcing structure and reinforcing method for bolt joint joining part of h-shaped steel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reinforcing structure and a reinforcing method using no fire in reinforcing a bolt joint joining part of an H-shaped steel.SOLUTION: The reinforcing structure for the bolt joint joining part of an H-shaped steel is constructed by providing webs 21, 22 with a through hole respectively which lies adjacent to the bolt joint joining part, arranging precast blocks 8, 9 having through holes on both sides of the webs 21, 22 of the H-shaped steels 1, 2 and between a bottom surface of an upper flange and a top surface of a lower flange so as to lie adjacent to or to straddle the bolt joint joining part, arranging steel plates 5, 6 on outer surfaces of and across the precast blocks, inserting a steel rod 7 into the through holes of the steel plate, the precast block, and the web, screwing nuts to both ends of the steel rod 7 to apply tensile force, whereby an upper surface of the each precast block is pressed against the bottom surface of the upper flange and a bottom surface of the each precast block is pressed against the top surface of the lower flange.

Description

  The present invention relates to a steel structure, and more particularly, to a reinforcing structure and a reinforcing method for a bolt joint joint of an H-shaped steel.

  The front view is shown in FIG.4 and FIG.5 about the joint connection part of the H-section steel in a structure. The joint portion is composed of bolt holes at the ends of the webs 21 and 22 and the flanges 23 and 27 in the H-shaped steels 1 and 2, the bolt 3 and the accessory plate 4. The structure is tightened. When the bolt 3 is a high-strength bolt, the load is transmitted between the H-shaped steels 1 and 2 and the accessory plate 4 by the frictional resistance of the contact surfaces of the H-shaped steels 1 and 2 and the accessory plate 4 caused by the bolt tension. . Further, when the bolt 3 is a rivet bolt, a load is transmitted between the H-section steels 1 and 2, the bolt 3, and the accessory plate 4 by the shear resistance and the bearing resistance of the rivet bolt.

  However, some steel structures having a bolted joint joint at the end of the member require reinforcement of the bolted joint joint.

  For example, in a structure to which a vertical force 14 is applied as shown in FIG. 16, when the vertical force 14 such as a fixed load, a loaded load, and a snow load increases with a change in the purpose of use, the column / beam / strain 11 It is necessary to reinforce the base metal frame and the bolt joint joint of the member that bears a vertical force such as.

  In addition, as shown in FIG. 17, there is a case where the proof strength of the bolted joint portion is smaller than the yield strength of the base steel frame in a straight member bearing a horizontal force 15 such as an earthquake load or a wind load. In such a case, the brace joint joint 13 becomes a weak point before the bracelet steel frame 12 exhibits its original load transmission performance when the horizontal force 15 increases, and the building may lose its proof strength brittlely. There is sex. Therefore, it is necessary to reinforce the brace joint joint 13 so that the bracelet steel frame 12 exhibits its original performance against the horizontal force so that the building can resist tenaciously.

Buildings designed by the seismic design method before 1980 have been designed with the seismic force for design that the uniform horizontal acceleration occurs in the height direction, but the actual acceleration is in the height direction. In order to increase, not only the bolted joint but also the reinforcement of the seismic strength of the entire building may be required.
The following forms are known as conventional reinforcing methods for such H-shaped steel bolt joint joints.

For example, the form of the reinforcement method of the junction part of the H-section steel by welding is shown in FIG. FIG. 4A is a front view, FIG. 5B is a view from above, and FIG.
In this form, the steel plate 16 is welded to the H-section steels 1 and 2 joined by the bolt 3, and a part of the load applied to the H-section steels 1 and 2 is transmitted to the steel plate 16 through the welded portion 17. In this method, the steel plate 16 compensates for the proof stress that is insufficient in the bolt joint.

  Similarly, as a method of reinforcing the joint portion of the H-section steel using welding, as shown in FIG. 19, the H-section steels 1 and 2 and the accessory plate 4 are welded W, and the H-section steel and the accessory plate are not interposed via bolts. A method of transmitting a load with a plate is known (see Patent Document 1).

  FIG. 20 shows a method for reinforcing the joint portion of the H-shaped steel without using welding. As shown in FIG. 6A, the existing bolt 18 is removed by gas cutting 19 and replaced with a new bolt 20 having a large diameter or high strength shown in FIG. There is something.

JP 2006-231338 A

Some buildings that require reinforcement of bolted joints may have interior and exterior materials made of flammable materials, gas pipes, electrical wiring, etc. near the bolted joints. Strict fire curing is required for interior and exterior materials, gas piping, and electrical wiring. As a result, there are problems such as prolonged process and increased cost due to heat curing, as well as safety concerns.
Furthermore, when performing reinforcement work using welding with heat curing, in order not to affect the use and restrictions on the users and operations inside the building, it is necessary only at the regular maintenance period carried out at night or several times a year. It is necessary to carry out construction work, so that the work is divided into several times, and there is a problem that the process becomes longer.
In order to solve such problems, reinforcement technology for bolt joint joints that does not use fire is required, but even with the bolt replacement method that does not use welding, it is necessary to cut the gas when removing the existing bolts. The same problem occurs.
In addition, when a large amount of fluid curable material is used for the reinforcement structure of the H-shaped steel bolt joint joint, in the reinforcement work of beams or braces at high places, fluid aging materials at high places are used. Therefore, if the amount of the time-curable material is small, the workability is improved.
Then, this invention made it the subject to enable the reinforcement of a bolted joint which does not use a fire by using a precast block, and the reinforcement structure of the bolted joint part of the H-section steel which solved such a problem, and The object is to provide a reinforcing method.

The inventors of the present invention have made various studies on the reinforcing structure and the reinforcing method of the bolt joint joint without using fire, and have completed the present invention.
The gist of the present invention is as follows.
In the reinforcing structure of the H-shaped steel bolt joint joint of the first invention, in the reinforcing structure of the H-shaped steel bolt joint joint, a through hole is provided in each web adjacent to the bolt joint joint, and the bolt joint A through hole is provided on both sides of each H-section steel web and between the lower surface of the upper flange of the H-section steel and the upper surface of the lower flange so as to be adjacent to the joint portion or straddling the bolt joint portion. Precast blocks are arranged, steel plates with through holes are arranged on the outside of the precast blocks on both sides of the H-shaped steel web, and steel rods with male threaded portions at the ends are inserted through the steel plates, precast blocks and webs. It is characterized by being inserted into the hole and screwed into a male threaded portion at the end of each steel rod.
According to a second aspect of the present invention, in the reinforcing structure for the bolted joint portion of the H-shaped steel of the first aspect, the precast block is a concrete precast block, a mortar precast block or a synthetic resin precast block.
According to a third aspect of the invention, in the reinforcing structure for a bolted joint portion according to the first or second aspect, a grout is interposed between and attached to each precast block and the steel plate or H-shaped steel.
According to a fourth invention, in the reinforcing structure for a bolted joint joint according to the first to third inventions, the steel plate is bolted between the flanges of a pair of half-divided steel plates having a joining flange at the end, and the tensile force And compressive force can be transmitted.
In the fifth invention, in the reinforcing structure of the bolt joint joint portion of the first invention to the third invention, the steel plates are joined by connecting the joints of the half-divided steel plates having the mesh joints at the ends, and the tensile force. And compressive force can be transmitted.
According to a sixth aspect of the present invention, there is provided a method for reinforcing an H-shaped steel bolt joint joint. In the method for reinforcing an H-shaped steel bolt joint joint, each bolt is provided with a through hole adjacent to the bolt joint joint, and then the bolt. A through-hole that is adjacent to the joint joint or straddles the bolt joint joint and is on both sides of each H-section steel web and between the lower surface of the upper flange of the H-section steel and the upper surface of the lower flange. A steel plate having a through hole and a steel rod provided with a male threaded portion at the end of the steel plate and the precast block. The nuts are inserted into the through-holes of the web, the nuts are screwed into the male threads at the ends of the steel rods, and tension is applied to the steel rods. The precast blocks are elastically deformed in the direction between the upper and lower flanges of the H-section steel, and the upper surface of each precast block is directed toward the lower surface of the upper flange, and the lower surface of the precast block is the lower flange. It is characterized by respectively pressing toward the upper surface.
According to a seventh aspect of the present invention, the precast block is a concrete precast block, a mortar precast block, or a synthetic resin precast block.
According to an eighth aspect of the invention, in the method for reinforcing the bolted joint portion of the H-shaped steel of the sixth or seventh aspect, a grout is provided between each precast block and the H-shaped steel.
According to a ninth aspect of the invention, in the method for reinforcing the bolted joint portion of the H-shaped steel according to any of the sixth to eighth aspects, the steel plate has a pair of half-divided steel plate flanges each having a joining flange at the end. It is characterized by being capable of transmitting a tensile force and a compressive force by being bolted.
According to a tenth aspect of the invention, in the method for reinforcing a joint of a H-shaped steel bolt joint according to any one of the sixth to eighth aspects of the invention, the steel plates are meshed with each other with the joints of half-divided steel plates having meshing joints at the ends. Connected to each other to transmit a tensile force and a compressive force.

According to the present invention, it is possible to reinforce the joint of the H-shaped steel bolt joint without using fire, and even if there are inner and outer materials, gas piping, and electrical wiring in the vicinity of the bolt joint, fire curing is not required, thereby shortening the process. Cost reductions and even greater safety.
In addition, the reinforcement structure of the bolt joint joint of the present invention has a simple structure by using a precast block directly or with a grout interposed as a reinforcement structure of an H-shaped steel bolt joint joint without using fire. An effect that the strength can be surely improved and reinforcement can be obtained.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a first embodiment of a reinforcing structure for a joint joint of an H-section steel according to the present invention, in which (a) is a front view and (b) is a cross-sectional view taken along line aa in (a). . It is a side view which shows the construction procedure of 1st Embodiment of the reinforcement structure of the bolt joint junction part of the H-section steel concerning this invention, Comprising: The state which provided the through-hole in the web of each H-section steel. FIG. 2 shows a state in which precast blocks having through holes are arranged so that the through holes of the webs coincide with each other through the side surfaces of the webs of the respective H-section steels from the state shown in FIG. (A) is a front view and (b) is a cross-sectional view taken along line bb of (a). It is the front view which showed an example of the bolt joint junction part of H-section steel. It is the front view which showed the other example of the bolt joint junction part of H-section steel. The 2nd Embodiment of the reinforcement structure of the bolt-joint joint part of the H-section steel concerning this invention is shown, Comprising: (a) is a front view, (b) is the cc sectional view taken on the line of (a). . The 3rd Embodiment of the reinforcement structure of the bolt-joint joint part of the H-section steel concerning this invention is shown, Comprising: (a) is a front view, (b) is the dd sectional view taken on the line of (a). . The 4th Embodiment of the reinforcement structure of the bolt joint junction part of the H-section steel concerning this invention is shown, Comprising: (a) is a front view, (b) is the ee sectional view taken on the line (a). . The 4th Embodiment of the reinforcement structure of the bolt joint junction part of the H-section steel concerning this invention is shown, Comprising: (a) is a front view, (b) is the ff sectional view taken on the line of (a). . The 5th Embodiment of the reinforcement structure of the bolt joint junction part of the H-section steel concerning this invention is shown, Comprising: (a) is a front view, (b) is a gg sectional view taken on the line (a). . The construction procedure of 5th Embodiment of the reinforcement structure of the bolt-joint joint part of the H-section steel concerning this invention is shown, Comprising: After the state shown in FIG. 2 which provided the through-hole in each H-section steel web, The state which has arrange | positioned a half precast block is shown, Comprising: (a) is a front view, (b) is the hh sectional view taken on the line of (a). The 6th Embodiment of the reinforcement structure of the bolt joint junction part of the H-section steel concerning this invention is shown, Comprising: (a) is a front view, (b) is the ii sectional view taken on the line of (a). . FIG. 12 shows the steel plate used in FIG. 12, which shows a form in which the steel plate is a pair of split steel plates having meshing joints at the ends, (a) is a front view, and (b) is a front view. It is a top view of (a). The other form at the time of setting it as a pair of split-type steel plate which has a meshing joint in an edge part is shown, (a) is a front view, (b) is a top view of (a). (A) is a top view which shows the precast block used for the reinforcement structure of the bolt joint junction part of the H-section steel of 1st Embodiment of this invention, (b) is the bolt of H-section steel of 2nd Embodiment of this invention. It is a top view which shows the precast block used for the reinforcement structure of a joint junction part. It is a figure which shows the structure to which the vertical force was added. It is a figure which shows the structure to which the horizontal force was added. It is a figure which shows the structure of embodiment of the reinforcement structure of the bolt joint junction part of H-section steel by steel plate welding, (a) is a front view, (b) is a top view, (c) is sectional drawing. It is a figure which shows the prior art which performs load transmission with an H-section steel and an accessory plate without passing a volt | bolt. It is sectional drawing which shows the prior art of the reinforcement structure of the bolt joint junction part of H-section steel by bolt replacement.

  Hereinafter, a first preferred embodiment of the present invention will be described with reference to FIGS.

  1A and 1B show a main configuration of the present invention. FIG. 1A is a front view, FIG. 1B is a cross-sectional view, and shows a conventional H-shaped steel bolt joint joint shown in FIGS. The form which is reinforced is shown. Parts similar to those in the structure shown in FIGS. 4 and 5 are given the same reference numerals. 4 and 5, the joint portion of the H-shaped steel has bolts provided on the webs 21 and 22 and the flanges 23 and 27 at the ends of the H-shaped steels 1 and 2. Bolts 3 are inserted into the holes, and the webs 21 and 22 or the flanges 23 and 27 of the H-shaped steels 1 and 2 and the accessory plate 4 are fastened by the bolts 3 and nuts 7a.

From the state as described above, as shown by a two-dotted line in FIGS. 4 and 5 and a solid line in FIG. The webs 21 and 22 at the separated positions are provided with at least one through hole 1a and 2a adjacent to the bolt joint joint. A plurality of the through-holes 1a and 2a may be provided at intervals in the axial direction of the H-section steel and / or in the direction perpendicular to the H-shaped steel (cone direction).
Next, as shown in FIG. 3, the precast blocks 8 and 9 are arranged so as to straddle the web joints between the webs 21 and 2 in each of the H-shaped steels 1 and 2, and the flanges and flanges. It arrange | positions so that it may mount in the lower flange 23 so that a mutual bolt joint junction part may be straddled. In addition, the planar form of the precast blocks 8 and 9 is shown in FIG.
As mentioned above, in order to straddle the bolt joint joint part between the webs and the bolt joint joint part between the flanges, the upper and lower end parts in the beam ridge direction are provided at the center part of each precast block 8, 9. Each of the precast blocks 8 and 9 is provided with a central connection part 51 having a concave part 50 on the inner side in the plate thickness direction. The end blocks 52 at both ends in the beam axis direction are integrated with each other. Due to the notched recess 49 and the recess 50, the central portion of each of the precast blocks 8 and 9 is prevented from interfering with the bolt joint joint between the webs and the bolt joint joint between the webs.
In the illustrated embodiment, the height dimension on both ends of the precast blocks 8 and 9 is slightly lower than the height dimension between the lower surface of the upper flange of the H-shaped steel and the upper surface of the lower flange. It is the size.
The height of both ends of the precast blocks 8 and 9 is approximately the same as or slightly smaller than the dimension between the lower surface of the upper flange of the H-shaped steel and the upper surface of the lower flange. Is set by

  The end blocks 52 at both ends of the precast blocks 8 and 9 are provided with at least one through hole 8a and 9a so as to match the through holes 1a and 2a provided in the webs 21 and 22, respectively. The through holes 8a and 9a provided in the end blocks 52 at both ends of the precast blocks 8 and 9 are aligned with the through holes of the H-shaped steel in the axial direction of the precast blocks 8 and 9 and / or perpendicular thereto. A plurality of them may be provided at intervals in any direction.

  The upper and lower inner corners facing the webs 21 and 22 in the end blocks 52 at both ends of the precast blocks 8 and 9 have inner flanges 23 and 27 in the H-shaped steels 1 and 2 and the webs 21 and 22. A corner portion having an arcuate cross section is provided so as to coincide with the rounded portion of the arcuate corner portion of the corner portion.

  The upper and lower inner corners facing the webs 21 and 22 in the end blocks 52 at both ends of the precast blocks 8 and 9 are corners adapted to the cross-sectional form of the inner corners of the H-shaped steels 1 and 2, respectively. Is done. The width dimensions of the end blocks 52 at both ends of the precast blocks 8 and 9 corresponding to the flange width direction of the H-shaped steels 1 and 2 are set on one side of the flanges 23 and 27 protruding from the web webs 21 and 22. It is set to the dimension or dimensions before and after it. Moreover, the length dimension of the said precast blocks 8 and 9 corresponding to the axial direction of H-section steels 1 and 2 is suitably set by design.

  Next, as shown in FIGS. 1A and 1B, rectangular steel plates 5 and 6 having through-holes 5a and 6a are attached to the respective precast blocks on both sides of the webs 21 and 22 of the H-shaped steels 1 and 2, respectively. The steel rod 7 having the male threaded portion 25 at both ends is arranged between the precast blocks 8 and 9 and the steel plates 5 and 6, respectively. The through holes 8a, 9a and 5a, 6a and 1a, 2a provided in the webs 21, 22 of the H-shaped steels 1, 2 are inserted.

Next, nuts 7a are respectively attached to the male threaded portions 25 at both ends of the steel rod 7, and the steel rod 7 is fixed to the steel plates 5 and 6 by the nut 7a, and the nut is screwed and tightened and tension is applied to the steel rod 7. Thus, the end blocks 52 at both ends of the precast blocks 8 and 9 are sandwiched from both sides via the steel plates 5 and 6.
In addition, tension is applied to the steel rod 7 by tightening with the nut 7a, and the end blocks 52 at both ends of the precast blocks 8 and 9 on both sides of the webs 21 and 22 of the H-shaped steels 1 and 2 are laterally moved. Are pressed by the steel plates 5 and 6 to elastically deform the end blocks 52 at both ends of the precast blocks 8 and 9 so as to extend in the direction between the upper and lower flanges 23 (27) of the H-shaped steels 1 and 2. The upper surfaces of the end blocks 52 at both ends of each precast block 8, 9 are pressed against the lower surface of the upper flange 23 (27), and the lower surfaces of the precast blocks 8, 9 are pressed against the upper surface of the lower flange 23 (27).

  As for the material of the precast blocks 8 and 9, it is preferable to use a concrete precast block that is inexpensive and easy to convey, but a mortar precast block or a synthetic resin precast block can also be used. is there. A reinforced mortar precast block may be used as the mortar precast block, and an epoxy resin precast block or a urethane resin precast block may be used as the synthetic resin. When a concrete precast block is used, a synthetic resin material (synthetic resin fiber or the like) may be mixed.

Furthermore, if the steel bar 7 is a prestressed concrete structural steel bar (PC steel bar) that is stronger than the construction steel material, a greater tension can be introduced, and the precast block is firmly sandwiched between the H-section steel 1 , 2 and the precast blocks 8 and 9 can be increased in contact pressure, and integration can be increased.
By reinforcing the bolt joint portion of the H-section steel in such a form, when reinforcing the bolt joint joint portion of the H-section steel, it is possible to perform construction without using fire such as welding in the field.

Next, the operation of each part configured as described above will be described.
The axial load of the member is transmitted from one H-section steel 1 to the steel plates 5 and 6 via the precast blocks 8 and 9 and to the other H-section steel 2 via the steel plates 5 and 6 and the precast blocks 8 and 9. Communicated.
Since the precast blocks 8 and 9 are sandwiched from both sides by the tension introduced into the steel bar 7 from the H-section steel 1 to the precast blocks 8 and 9, the upper and lower flange surfaces of the H-section steel 1 and the web surface are in contact with each other. The pressure increases and is transmitted by friction and adhesion at the interface that occurs in response to the contact pressure.
The load transmitted to the precast blocks 8 and 9 is transmitted through the interior of the precast block by shear resistance.
Transmission from the precast blocks 8 and 9 to the flanges and webs of the H-shaped steels 1 and 2 and the steel plates 5 and 6 is caused by friction and adhesion between the H-shaped steels 1 and 2 or the steel plates 5 and 6 and the precast blocks 8 and 9.
By these actions, a load transmission path that does not involve an existing bolt joint is newly formed, and reinforcement is possible.

  When a plurality of steel rods 7 are provided on both sides of the steel plates 5 and 6, the pressing force against the H-section steels 1 and 2 of the end blocks 52 at both ends of the precast blocks 8 and 9 increases, and the member axial direction As described above, the shear load at right angles to the steel plate 5 is transmitted from one H-section steel 1 to the steel plates 5 and 6 through the precast blocks 8 and 9, and the other through the steel plates 5 and 6 and the precast blocks 8 and 9. To the H-shaped steel 2.

  In the said embodiment, although the form which arrange | positions one precast block over the one side of each H-section steel 1 and 2 was shown, when implementing this invention, each H-section steel like embodiment below, is shown. Two precast blocks 8 and 9 may be arranged on one side of 1 and 2, respectively. In this case, a precast block that does not have a grooved connecting portion that straddles the web joining portion may be used.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG. 6A is a front view, and FIG. 6B is a cross-sectional view taken along the line cc of FIG. 6A.
In this second embodiment and the first embodiment, a grout is provided in order to increase the pressing force and adhesion between the precast block and the precast block and the flange and web of the steel plate or H-shaped steel. Since the other points are the same as those of the above-described embodiment, the different points will be mainly described. In addition, the planar form of the precast blocks 8 and 9 is shown in FIG.

In this second embodiment, a precast block such as a half precast block which is smaller than the plate thickness of the end block 52 at both ends of each precast block 8, 9 of the first embodiment (for example, smaller by half in cross-sectional area). 8, 9 are used. In order to increase adhesion between the precast blocks 8 and 9 and the steel plates 5 and 6 or the flanges 23 and 27 of the H-shaped steels 1 and 2 and the webs 21 and 22 and transmit the pressing force reliably, the grouts 32 and 33 are provided. This is a form provided.
In this 2nd Embodiment, after the state shown in FIG. 2 which provided the through-holes 1a and 2a in the webs 21 and 22 of each H-section steel, the precast block 8, over one side of each H-section steel 1 and 2 9 and the steel plates 5 and 6 are arranged outside the precast blocks 8 and 9 and the steel rods 7 and nuts 7a are mounted, and the steel plates 5 and 6 are arranged at predetermined positions. Pre-cast blocks 8 and 9 and steel plates 5 and 6 are appropriately disposed on end sides of the steel plates 5 and 6 in the axial direction of the H-shaped steels 1 and 2 or on the side surfaces in the flange width direction as appropriate. The grouts 32 and 33 made of a time-curable material such as cement, mortar, or synthetic resin are filled so as to embed the spaces between the steel and the H-shaped steels 1 and 2, and the grouts 32 and 33 are cured. After that, the nut 7a is tightened.
By tightening the nut 7a, the end block 52 at both ends of the precast blocks 8 and 9 is sandwiched from both sides via the steel plates 5 and 6 by applying tension to the steel bar 7 as in the above embodiment. The end blocks 52 at both ends of the precast blocks 8 and 9 are pressed by the steel plates 5 and 6 from the lateral direction so that the end blocks 52 at both ends of the precast blocks 8 and 9 are The upper flange 23 (27) is elastically deformed slightly so as to extend in the direction between the upper and lower flanges 23 (27), and the upper surfaces of the end blocks 52 at both ends of the respective precast blocks 8 and 9 are passed through the grouts 32 and 33. The lower surfaces of the precast blocks 8 and 9 are pressed toward the upper surface of the lower flange 23 (27) through the grouts 32 and 33, respectively.
In the second embodiment, the grouts 32 and 33 are filled, so that the H-shaped steels 1 and 2, the precast blocks 8 and 9, and the steel plates 5 and 6 are attached via the grouts 32 and 33. It becomes reliable, and the pressing force through the precast blocks 8 and 9 and the grouts 32 and 33 when the nut 7a is tightened can be transmitted to the upper and lower flanges 23 (27) of the H-shaped steels 1 and 2. .
Further, as compared with the case where the steel plates 5 and 6 and the precast blocks 8 and 9 are in direct contact as in the first embodiment, the adhesion is ensured by interposing the grouts 32 and 33, and each steel plate 5 , 6 and grouts 32 and 33, grouts 32 and 33 and precast blocks 8 and 9, and grouts 32 and 33 and H-shaped steels 1 and 2 can be further integrated. it can. Therefore, the integration of the steel plates 5 and 6, the grouts 32 and 33, the precast blocks 8 and 9, and the H-shaped steels 1 and 2 can be enhanced. Therefore, a load can be transmitted from one H-section steel 1 to the other H-section steel 2 via the steel plates 5 and 6, the grouts 32 and 33, and the precast blocks 8 and 9. The effect of being able to aim at the burden reduction of this and reinforcement is acquired.

(Third embodiment)
Next, a third embodiment of the present invention will be described with reference to FIG. FIG. 7A is a front view, and FIG. 7B is a sectional view taken along the line dd in FIG.
The third embodiment is different from the second embodiment in the form of a precast block, and the other points are the same as those in the second embodiment. Therefore, the differences will be mainly described.
In this 3rd Embodiment, it is set as the form by which the independent precast block 8 and 9 is each arrange | positioned at the one side of the webs 21 and 22 of each H-section steel 1 and 2. As shown in FIG. In the second embodiment, the central connecting portion 51 is provided and the long precast blocks 8 and 9 extending over the H-section steels 1 and 2 are used. In the third embodiment, the central connecting portion 51 is provided. This is a form in which precast blocks 8 and 9 consisting only of the end blocks are arranged.
In the third embodiment, since the weight of one precast block 8, 9 is less than half that of the second embodiment, the workability of transporting the precast blocks 8, 9 is improved. The construction procedure and operation are the same as in the case of the second embodiment.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described with reference to FIGS. 8A and 9B are front views, and FIG. 8B is a cross-sectional view taken along the line ee or ff of FIG.
The fourth embodiment is different from the first embodiment in that the precast blocks 8 and 9 in a form not provided with the central connection portion 51 are used.

As shown in FIG. 9 from the state where at least one through hole 1a, 2a is provided in the webs 21, 22 as shown in FIG. 2, the precast blocks 8, 9 are connected to the webs 21, It arrange | positions so that it may mount in the lower flange 23 on 2 side surfaces.
The height dimensions of the precast blocks 8 and 9 are slightly lower than the height dimension between the lower surface of the upper flange of the H-shaped steel and the upper surface of the lower flange. For example, the height dimensions of the precast blocks 8 and 9 are the same as those of the end block 52 of the first embodiment.

  The precast blocks 8 and 9 are provided with at least one through hole 8a and 9a so as to match the through holes 1a and 2a provided in the webs 21 and 22, respectively. The through-holes 8a and 9a provided in the precast blocks 8 and 9 are aligned with the H-shaped steel through-holes 1a and 2a in the axial direction of the precast blocks 8 and 9 and / or a direction perpendicular to the direction (cone direction). ) May be provided at intervals.

  The upper and lower inner corners facing the webs 21 and 22 in the precast blocks 8 and 9 are arc-shaped corners of the inner corners of the flanges 23 and 27 and the webs 21 and 22 in the H-shaped steels 1 and 2. Corners having an arcuate cross section are provided so as to match the rounded portion.

  The upper and lower inner corners facing the webs 21 and 22 in the precast blocks 8 and 9 are corners matched to the cross-sectional shape of the inner corners of the H-shaped steels 1 and 2. The width dimension of the precast blocks 8 and 9 corresponding to the flange width direction of the H-shaped steels 1 and 2 is set to the dimension of one side of the flanges 23 and 27 protruding from the web webs 21 and 22 or the dimension before and after that. Is done. Moreover, the length dimension of the said precast blocks 8 and 9 corresponding to the axial direction of H-section steels 1 and 2 is suitably set by design.

  Next, as shown in FIGS. 8A and 8B, rectangular steel plates 5 and 6 having through-holes 5a and 6a are attached to the precast blocks on both sides of the webs 21 and 22 of the H-shaped steels 1 and 2, respectively. The steel rod 7 having the male threaded portion 25 at both ends is arranged between the precast blocks 8 and 9 and the steel plates 5 and 6, respectively. The through holes 8a, 9a and 5a, 6a and 1a, 2a provided in the webs 21, 22 of the H-shaped steels 1, 2 are inserted.

Next, nuts 7a are respectively attached to the male threaded portions 25 at both ends of the steel rod 7, and the steel rod 7 is fixed to the steel plates 5 and 6 by the nut 7a, and the nut is screwed and tightened and tension is applied to the steel rod 7. The precast blocks 8 and 9 are sandwiched from both sides via the steel plates 5 and 6.
And by pressing the precast blocks 8 and 9 on both sides of the webs 21 and 22 of the H-shaped steels 1 and 2 with the steel plates 5 and 6 from the lateral direction, the precast blocks 8 and 9 are It is elastically deformed so as to extend in the direction (vertical direction) between the upper and lower flanges 23 (27), the upper surface of each precast block 8, 9 is the lower surface of the upper flange 23 (27), and the lower surface of the precast blocks 8, 9 is lower Press against the top surface of the flange 23 (27).

  In this embodiment, the precast blocks 8 and 9 or the grout 3233 are not continuously arranged across the H-section steels 1 and 2, and only the steel plates 5 and 6 are disposed across the H-section steels 1 and 2. The point which is made into the form which is made is different from the said each embodiment, It enables shear force and axial force to be transmitted to each H-section steels 1 and 2 via the steel plates 5 and 6, and the bolt of H-section steel The joint is reinforced.

Next, the operation of each part configured as in the fourth embodiment will be described.
The axial load of the member is transmitted from one H-section steel 1 to the steel plates 5 and 6 through the precast blocks 8 and 9, and from the steel plates 5 and 6 to the other H-section steel 2 through the precast blocks 8 and 9 again. Is transmitted to.
Since the precast blocks 8 and 9 are sandwiched from both sides by the tension introduced into the steel bar 7 from the H-section steel 1 to the precast blocks 8 and 9, the upper and lower flange surfaces of the H-section steel 1 and the web surface are in contact with each other. The pressure increases and is transmitted by friction and adhesion at the interface that occurs in response to the contact pressure.
The load transmitted to the precast blocks 8 and 9 is transmitted through the interior of the precast block by shear resistance.
Transmission from the precast blocks 8 and 9 to the flanges and webs of the H-shaped steels 1 and 2 and the steel plates 5 and 6 is caused by friction and adhesion between the H-shaped steels 1 and 2 or the steel plates 5 and 6 and the precast blocks 8 and 9.
By these actions, a load transmission path that does not involve an existing bolt joint is newly formed, and reinforcement is possible.

  In the case where a plurality of steel rods 7 are provided on both sides of the steel plates 5 and 6 facing the precast blocks 8 and 9, the shear load perpendicular to the member axial direction is applied to the precast block from one H-section steel 1. It is transmitted to the steel plates 5 and 6 through 8 and 9, and is transmitted from the steel plates 5 and 6 to the other H-section steel 2 through the precast blocks 8 and 9 again.

Next, a fifth embodiment of the present invention will be described with reference to FIGS.
The fifth embodiment is different from the fourth embodiment in that a grout is provided in order to enhance adhesion between the precast block and the precast block and the steel plate or H-shaped steel web. Since this point is the same as that of the above-described embodiment, the difference is mainly described.

  10 (a) is a front view, FIG. 10 (b) is a cross-sectional view taken along the line gg of FIG. 10 (a), and FIG. 11 shows a construction procedure. FIG. 11 (a) is a front view showing a state in which a half precast block that is significantly smaller than the cross-sectional area of the embodiment (for example, about half the cross-sectional area) is disposed after the state shown in FIG. (B) is the hh sectional view taken on the line of (a).

  This sixth embodiment is a half precast block having a substantially I-shaped cross section as the precast blocks 8 and 9, and in order to enhance the adhesion and integration of the H-shaped steels 1 and 2 with the webs 21 and 22 or the steel plates 5 and 6, Concave portions 8b and 9b are provided on both side surfaces of the precast blocks 8 and 9, and grouts 32 and 33 made of a time-curable material such as cement, mortar, or synthetic resin are provided in the concave portions 8b and 9b.

  The grouts 32 and 33 may be provided in advance in the recesses 8b and 9b on both side surfaces of the precast blocks 8 and 9, and after the precast blocks 8 and 9 are arranged on the H-shaped steel, the precast blocks 8 and 9 are provided. And the steel plates 5 and 6 and the webs 21 and 22 may be filled.

When the grouts 32 and 33 are provided, the steel plates 5 and 6, the steel rod 7 and the nut 7 a are set, and the end formwork is appropriately formed at the end portions of the precast blocks 8 and 9 in the axial direction of the H-shaped steels 1 and 2. (Not shown) may be provided to fill the grouts 32 and 33. In this case, the grouts 32 and 33 may wrap around between the precast blocks 8 and 9, the H-shaped steels 1 and 2, and the steel plates 5 and 6. Therefore, the grouts 32 and 33 may also wrap around between the precast blocks 8 and 9 and the flanges 23 and 27 of the H-shaped steels 1 and 2.
Further, after the grouts 32 and 33 are hardened, the steel plates 7 and nuts 7a are used to tighten the steel plates and the precast blocks 8 and 9.
Also in this form, the form which arrange | positions one precast block 8 and 9 over the one side of each H-section steel may be sufficient.

  FIG. 12 shows a sixth embodiment as a representative form for indicating that two half-divided steel plates 47 and 48 may be connected in series as the steel plates 5 and 6. Since this part is the same as that of the above embodiment, the different part will be described.

As the steel plates 5 and 6 for reinforcing the joint portion of the H-shaped steel, since the weight of one steel plate is heavy, the half-divided steel plates 47 and 48 are reduced in weight, and the handleability is improved. The half-divided steel plates 47 and 48 are bolted to form steel plates 5 and 6.
As the half-divided steel plates 47 and 48, in the form shown in the figure, one end portion in the longitudinal direction of the H-section steel is provided with joining flanges 34 and 35 projecting outward at right angles to the half-divided steel plate body. The flanges 34 and 35 are provided with a plurality of bolt insertion holes 36 and 37 at intervals, and through holes 5a and 6a are provided in each half-divided steel plate body (see FIG. 13).
The pair of half-divided steel plates 47 and 48 are arranged in series so that the joining flanges 34 and 35 of the half-divided steel plates 47 and 48 are abutted, and are bolted by a plurality of bolts and nuts 46. .
Each of the half-divided steel plates 47 and 48 may be bolted at the time of grounding or may be lifted and bolted.
FIG. 13 shows a view in which the steel plates 5 and 6 obtained by joining a pair of half-divided steel plates 47 and 48 are taken out.
As shown by the arrows, the steel plates 5 and 6 having the above-described configuration can transmit tensile force via bolts and nuts, and can transmit compressive force by the opposing joining flanges 34 and 35. Has been.

  FIG. 14 shows another embodiment in which the steel plates 5 and 6 are configured by combining the half-divided steel plates 47 and 48. In this embodiment, the steel plates have half-joints 38 and 39 at the ends. The joints 38 and 39 of the split steel plates 47 and 48 are meshed and connected to each other so that a tensile force and a compressive force can be transmitted.

  One half-divided steel plate 47 has a bearing wall including a locking projection 40, a locking groove 41, and a half-divided steel plate main body connected to the locking groove 41 at the end thereof. A half-divided steel plate 47 having a meshing joint 38 as a portion 42 is provided (the left half-divided steel plate 47 in FIG. 14).

  The other half-divided steel plate 48 is provided at its end with a locking projection 43 that continues in the height direction and a support wall portion 45 that is parallel to and spaced from the locking projection 43. A half-divided steel plate 48 having a meshing joint 39 with a locking groove 44 between the portions 45 is formed (the right-side half-divided steel plate 48 in FIG. 14).

Even when the half-divided steel plates 47 and 48 having such a configuration are combined in series, the half-divided steel plates 47 and 48 are engaged with each other by the engagement of the locking projections 40 and 43, the locking grooves 41 and 44, and the support wall portion 45. The transmission of the tensile force or the compressive force in the direction perpendicular to the joint portion (the left-right direction in FIGS. 13b and 14b) between the 48 joints is enabled (indicated by arrows in FIG. 14).
In each of the above embodiments, a half-divided steel plate as shown in FIG. 13 or FIG. 14 may be used.
In addition, you may provide a stiffening rib in the outer surface of the steel plates 5 and 6 or the half-divided steel plates 47 and 48 which comprise this. The thickness of the steel plates 5 and 6 or the half-split steel plates 47 and 48 constituting the steel plates 5 and 6 is set by design.

  Instead of the precast block of the above-described embodiment, it is conceivable to fill a filler between the H-shaped steel web and the steel plate. However, as in the above-described embodiment, the reinforcing structure using the precast block is used. In this case, there is no on-site filling amount, or the filling amount of the filler can be remarkably reduced, and the workability is improved.

  In the case of the said embodiment, although the form which provides one through-hole in a precast block was shown, while making a plurality of through-holes provided in each H-section steel web, and making a plurality of through-holes provided in a precast block, a plurality In the form in which the steel rod 7 is fixed, the present invention can also be applied to the joint itself as a substitute for the bolt joint whose function as the joint is deteriorated due to corrosion or thinning of the H-shaped steel base steel and the bolt. Is available.

  The present invention relates to a steel structure, and is not limited to buildings, and can be widely used for reinforcing bolt joint joints of H-shaped steel members such as machine frames and workpieces.

Further, the present invention can also be used as a joint itself in place of a bolt joint whose function as a joint is deteriorated due to corrosion or thinning of an H-shaped steel base steel frame and bolt.
Furthermore, the present invention can also be used as a reinforcing method for improving the cross-sectional performance of the H-shaped steel base steel frame.

1, 2, ... H-section steel 1a, 2a ... Through hole 3 ... Bolt 4 ... ··· Plates 5, 6 ······· Steel plates 5a, 6a ··························································· · Nut 8, 9 ··············· Precast block 8a, 9a through hole 8b, 9b ······························ 12 ················································································································· Vertical force 15 ..... Horizontal force 16 ..... Steel plate (or shape steel)
17 ... welded part 18 ... existing bolt 19 ... gas cutting 20 ... New bolts 21 and 22 ... Web 23 and 27 ... Flange 25 ... Male thread 32 and 33 ... Grout 34, 35 ... Flange for joining 36, 37 ... Bolt insertion hole 38, 39 ... Intermeshing joint 40- ·········································································································· Locking projection 44 Locking groove 45 Bearing wall 46 Bolt / nut 47 Half-split steel plate 48 Half-split steel plate 49 Notch recess 50 Concave portion 51 Center Part 52 end blocks

Claims (10)

  In the reinforcement structure of the bolt joint joint of H-shaped steel, a through hole is provided in each web adjacent to the bolt joint joint, so as to straddle the bolt joint joint or straddle the bolt joint, Precast blocks having through holes are arranged on both sides of each H-shaped steel web and between the lower surface of the upper flange of the H-shaped steel and the upper surface of the lower flange. The steel rods arranged on the outer sides of the precast blocks on both sides of the web are respectively inserted into the through holes of the steel plate, the precast block and the web, and the male screw portions at the end portions of the respective steel rods are inserted into the male screw portions. Reinforcement structure for H-shaped steel bolt joints, wherein each nut is screwed and tightened.   The reinforcing structure for a bolt joint joint portion of H-shaped steel according to claim 1, wherein the precast block is a concrete precast block, a mortar precast block or a synthetic resin precast block.   The reinforcing structure for the joint part of H-shaped steel bolt joint according to claim 1 or 2, wherein a grout is interposed between each precast block and the steel plate or H-shaped steel.   4. The steel sheet according to any one of claims 1 to 3, wherein the flanges of a pair of half-divided steel sheets having a flange for joining at the end are bolted together to transmit a tensile force and a compressive force. The reinforcement structure of the joint part of the H-shaped steel bolt joint described in the above.   4. The steel sheet according to any one of claims 1 to 3, wherein the joints of half-divided steel sheets having meshing joints at the ends are meshed and connected to each other so as to transmit tensile force and compression force. The reinforcement structure of the joint part of the H-shaped steel bolt joint described in the above.   In the method of reinforcing the bolt joint joint of H-shaped steel, after providing a through hole in each web adjacent to the bolt joint joint, adjacent to the bolt joint joint or straddling the bolt joint joint. A precast block having a through hole is disposed on each side of the web of each H-shaped steel and between the lower surface of the upper flange of the H-shaped steel and the upper surface of the lower flange. The steel rods arranged on both sides of the shaped steel web on the outside of each precast block and having male threaded portions at the ends are inserted into the steel plate, the precast block and the through holes of the web, and the end portions of the steel rods Each nut is screwed and tightened to each male screw part, and tension is applied to the steel bar, and the precast blocks on both sides of the H-shaped steel web are pressed from the side to make each precast block The hook is elastically deformed in the direction between the upper and lower flanges of the H-shaped steel, and the upper surface of each precast block is pressed toward the lower surface of the upper flange, and the lower surface of the precast block is pressed toward the upper surface of the lower flange. Reinforcing method for bolted joints of H-section steel.   7. The method for reinforcing a bolted joint joint of H-shaped steel according to claim 6, wherein the precast block is a concrete precast block, a mortar precast block or a synthetic resin precast block.   The method for reinforcing a bolted joint joint of H-shaped steel according to claim 6 or 7, wherein a grout is provided between each precast block and the H-shaped steel.   9. The steel sheet according to any one of claims 6 to 8, wherein the flanges of a pair of half-divided steel sheets having a joining flange at the end are bolted together to transmit a tensile force and a compressive force. A method for reinforcing a bolt joint joint of H-shaped steel according to claim 1.   9. The steel sheet according to any one of claims 6 to 8, wherein the joints of the half-divided steel sheets having meshing joints at the ends are meshed and connected to each other so as to transmit a tensile force and a compressive force. A method for reinforcing a bolt joint joint of H-shaped steel according to claim 1.

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