JP6599377B2 - Switching hardware for cut beams - Google Patents

Description

  The present invention relates to a switching hardware for switching the cross section of a large cross section beam.

  As a means of supporting mountain retaining walls such as sheet piles, there is known a beam-type support structure that combines abdominal material, a beam material, a fire hitting material, etc. It is used and assembled by bolt connection (Patent Documents 1 to 3).

Since the cutting beam material made of H-shaped steel has a limit in the erection length and the bearing strength, when the erection length is long, a square steel pipe is used instead of the H-shaped steel as the timber beam (Patent Document 4).
A square steel pipe cut beam material has a sealed structure in which both ends of the square steel pipe are sealed from the viewpoint of preventing corrosion.
Cut beam materials made of square steel pipes can easily be adjusted by changing the length of the main material on the side surface of the cut beam material because the corrosion resistance is impaired if a plurality of bolt holes are drilled on the side surface. However, it is impossible to use the H-shaped steel hitting material that can be used, and it is forced to use a hitting block whose length is difficult to adjust. Furthermore, in the case of a square steel pipe, since the internal maintenance cannot be performed, many problems such as the fact that the entire cut beam material has to be discarded if the inside is corroded or damaged are included.

Japanese Utility Model Publication 2-333838 (FIG. 2) Japanese Patent Laying-Open No. 2011-236642 (FIG. 1) Japanese Patent Laying-Open No. 2015-175226 (FIGS. 1 and 2) JP-A-4-68114 (FIGS. 1 to 3)

In order to solve the problems of the square steel pipe, the applicant previously proposed a high-strength beam material that welded and integrated between the inner flanges in which a pair of H-shaped steels were abutted in parallel.
In this high-strength beam material, a continuous closed space having a square cross section is formed at the center of the beam material, and a plurality of bolt holes are formed along the outer flange of the beam material. .
A cross-sectionally long cut beam with a pair of H-shaped steels can have a larger cross-sectional performance than a conventional H-shaped steel alone or a square steel pipe alone, and a known fired material is joined to the outer flange with bolts. It has the characteristics of being able to.

When medium-width H-section steel (H390 x 300, H340 x 250) is used, the web spacing of the beam is wide (250 to 300 mm), so a jack is placed at the end of the large cross-section beam If you do, you must place two jacks.
In addition, if the high-strength steel beam has a right-angle relationship with the bulge material, the edge of the timber material can be bolted directly to the galvanized material. Can not be directly bolted to the belly material, and a large dimensional difference is generated, so that it is not possible to use a publicly-known free-fire receiving piece (cut beam piece).

The present invention has been made in view of the above points, and an object of the present invention is to provide a switching metal for a beam material corresponding to a large cross-section beam material in which a pair of H-section steels are arranged in parallel. It is in.
Still another object of the present invention is to cut the cross section of the cut beam material to a small size, and to attach an incidental material such as a conventional general jack or corner adjusting piece to the end of the large cross section of the cut beam material. Is to provide switching hardware.

The present invention is a switching hardware for switching the cross-section of a large cross-section beam material in which a pair of H-section steels are arranged side by side, the section steel having a cross-section H-shape, and wider than the section steel, A large end plate fixed to one end and a small end plate having the same width as that of the shape steel and fixed to the other end of the shape steel. In order to function as a transmission member, the section steel is interposed between the large end plate and the small end plate facing each other, and the large end plate side is connected to the end face of the beam member. It is characterized by that.
In another embodiment of the present invention, the section steel has an H-shaped cross section in which a pair of flanges are connected by a web, and the section steel web is in a parallel relationship with the web of the beam material.
In another embodiment of the present invention, the section steel has an H-shaped cross section in which a pair of flanges are connected by a web, and the section steel web is orthogonal to the web of the beam.
In another embodiment of the present invention, a plurality of stiffeners are attached to both sides of the shaped steel web between the large end plate and the small end plate.
In another embodiment of the present invention, a plurality of reinforcing plates are attached between the large end plate and the flange .
In another embodiment of the present invention, the cross-beam material is made of a pair of section steels having a flange and a web, and the cross-sectional shape in which the pair of section steels are arranged side by side and fixed between the flanges by welding is II type. A cross beam body having a dimension capable of sealing the entire cross section of the beam main body, and an end plate attached to an end portion of the beam main body, and a cross section square at the center of the beam main body. A continuous closed space is formed, groove-shaped open spaces are formed on both sides of the beam main body, and the end plate seals the closed space to form a sealed structure, except for the closed space; A plurality of bolt holes are formed along the flange facing the open space of the main body.

The present invention has the following effects.
<1> A switching hardware having a high compression strength can be provided while corresponding to a large cross-section beam having a pair of H-shaped steels arranged in parallel.
<2> Even if there is a large dimensional difference between a large cross-section beam material and a conventional general beam material, jack, free-fire hitting piece, etc., a switching beam is interposed between them. Since the cross section of the material can be switched to a small size, conventional general beam materials, jacks, free fire receiving pieces and the like can be used as they are.
<3> Since the cross section resisted by the switching hardware is the entire cross section of the section steel (a pair of flange and web), the transmission efficiency of the axial force by the switching hardware is significantly increased.
<4> By using a switching hardware and a large cross-section beam together, the high yield strength of the large cross-section beam can be maximized.

The perspective view of a beam-type support which applied the switching hardware concerning the present invention Assembly drawing of edge of cut beam and switching hardware Sectional view of the joint between the beam material and the fire-fitting bracket Exploded view of switching hardware It is explanatory drawing of the reinforcement structure of a switching hardware, (A) is explanatory drawing of the reinforcement structure which attached the stiffener, (B), (C) attached the reinforcement board between the junction parts of a large-sized end plate and a flange, and was reinforced. Illustration of reinforcement structure Plan view of a support work with jacks placed at the end of the beam through the switching hardware Plan view of a support work with a free fire receiving piece placed at the end of the beam through the switching hardware Plan view of support work with conventional beam material placed at the end of the beam material via switching hardware Perspective view of another switching hardware with the direction of the shape steel changed

  Embodiments of the present invention will be described below with reference to the drawings.

<1> Cut beam type support work FIG. 1 shows an example of a cut beam type support work for supporting the mountain retaining wall 10.
The mountain retaining wall 10 is a known earth retaining structure such as a steel sheet pile or underground wall shown in the figure.
In the illustrated beam support system, the beam members 30 are disposed horizontally in the direction perpendicular to the flank material 20, and the fire striking material 40 is disposed obliquely between the burial material 20 and the beam member 30. A switching hardware 50 and a jack 60 are interposed between the end portion of the beam member 30 and the erection material 20.

<2> Cut Beam Material Referring to FIGS. 2 and 3, the cut beam material 30 has a pair of section steels 30A having an H-shaped cross section so that a rectangular closed space S1 continuous along the longitudinal direction can be defined. , 30B are arranged in parallel in the horizontal direction and fixed to the beam main body 35 and an end plate 38 fixed to the end of the beam main body 35.
Since the cross beam performance of the cut beam material 30 is larger than that of the H-shaped steel alone or the square steel pipe alone, the arrangement interval of the cut beam material 30 can be greatly expanded as compared with the conventional one.

<2.1> Cut Beam Main Body The cut beam main body 35 is formed by joining a pair of structural steels 30A and 30B.
Each shape steel 30A, 30B is a steel material having the same shape and the same dimensions, including a pair of first and second flanges 31, 32 and a web 33 connecting the flanges 31, 32, and is commercially available. H-section steel can be used.
The pair of structural steels 30A and 30B are positioned adjacent to each other such that the first flanges 31 and 31 and the second flanges 32 and 32 are located on the same plane and the pair of webs 33 and 33 are opposed to each other.
A plurality of bolt holes 37 are drilled along the longitudinal direction in portions outside the first and second flanges 31 and 32 of the pair of shape steels 30A and 30B. Bolt holes are not drilled in portions inside the first and second flanges 31 and 32.
The cross beam main body 35 has a large cross-sectional performance (strong against bending and buckling) compared to a conventional H-section steel alone or a square steel pipe alone, and is excellent in strength.

<2.1.1> closed space and open space Setsuhari body 35 is a closed space S ₁ which is continuous cross-sectional shape exhibits a square is formed in the center thereof, a groove-like continuous on both sides thereof (a U-shaped cross section ) Open spaces S ₂ and S ₂ are formed.
The closed space S ₁ is defined by a portion inside the pair of upper and lower first and second flanges 31 and 32 facing each other and a pair of left and right webs 33 and 33 facing each other.
The open spaces S ₂ and S ₂ are defined between a portion outside the pair of upper and lower first and second flanges 31 and 32 and the left and right webs 33 and 33.
The center portion of the beam main body 35 is surrounded by the first and second flanges 31 and 32 and the webs 33 and 33 constituting the pair of shape steels 30A and 30B, and is formed into a square steel tube. This is to improve the cross-sectional performance.
First, to the second flange 31 and 32 were overhang horizontally, horizontally tension without affecting the closed space S ₁ constituting the pair of shaped steel 30A, and 30B on both sides of Setsuhari body 35 This is because a bolt hole 37 is formed in a portion outside the first and second flanges 31 and 32 that have been taken out.

<2.1.2> Shape Steel Fixing Means As means for fixing between the adjacent shape steels 30A and 30B, between the first flanges 31 and 31 and the second flanges 32 and 32 of both shape steels 30A and 30B. Although it is conceivable to use bolts that can be covered between them, the bolts may be joined together. However, if the bolts and a large number of bolts are used, the amount of steel used increases, resulting in problems of increased weight and high cost.

Therefore, in this example, the abutting portions between the first flanges 31 and 31 and the abutting portions of the second flanges 32 and 32 of the adjacent double shaped steels 30A and 30B are fixed by partial welding 36.
The partial weld 36 can be formed by subjecting the first flange 31 and the second flange 32 of each shape steel 30A and 30B to groove processing at a predetermined interval (for example, 0.5 m interval) and performing partial penetration welding.
Since both the shape steels 30A and 30B can be joined without using the accessory plate and a large number of bolts, the problem of increase in weight and high cost does not occur.

<2.1.3> Reason for Adopting Partial Welding In this example, partial welding 36 was adopted instead of continuous welding as a connecting means for the two shape steels 30A and 30B.
The reason why the partial welding 36 is employed is to shorten the welding time of the two shaped steels 30A and 30B and to easily separate the shaped steels 30A and 30B by gas cutting or the like.
The reason why the section steels 30A and 30B can be separated by the partial welding 36 is to facilitate maintenance of the inside of the beam main body 35 and to facilitate replacement of the damaged section steels 30A and 30B. .

<2.1.4> bolt holes closed space _{S 1} in facing no shape steel 30A, a part of the outside of the first flange 31 of 30B, at a portion outside the second flange 32, a plurality along the longitudinal direction thereof Bolt holes 37 are formed.
First facing the closed space _{S 1} in other words, without the bolt hole 37 is formed at a portion of the inside of the second flange 31 and 32, the first facing the open space _{S 2,} the second flange 31 and 32 Bolt holes 37 are formed in the outer portion.

<2.2> End Plate The end plate 38 is a rectangular plate having a dimension capable of sealing the entire cross section of the beam main body 35 and is attached to the end of the beam main body 35 by welding.
In this example, a mode in which the vertical and horizontal dimensions of the end plate 38 are equal to the cross-sectional dimension of the beam main body 35 will be described, but the vertical and horizontal dimensions of the end plate 38 may be larger than the cross-sectional dimension of the beam main body 35.

<2.2.1> endplate features adjacent section steel 30A, the end plate 38 which is fixed across the end of the 30B not only the closed space _{S 1} of Setsuhari body 35 to complete the sealing structure, Axial force can be evenly transmitted to the pair of structural steels 30A and 30B through the end plate 38.
Furthermore, the end plate 38 completely seals the closed space S ₁ of the beam member 30 and helps to prevent corrosion inside the beam member 30.

<2.2.2> plurality of bolt holes 39 are formed in the end plate 38 facing the bolt holes open space S _2, no bolt holes 39 are formed in the end plate 38 facing the closed space S ₁ .

<3> Firing material Referring to FIG. 1, the flaking material 40 includes a well-known H-shaped steel flaking body 41, and a well-known bracing metal fitting 42 joined to the end of the flaking body 41 with a bolt. To do.
A plurality of bolt holes are formed in the main body 41 and the main part 42. It can be connected via bolts and nuts.

A well-known fire striking material 40 is disposed between the flank member 20 and the side surface of the beam member 30, and can be connected to the side surface of the beam member 30 via a fire hitting bracket 43 with a bolt.
In the cut beam type support work of this example, the known beam hitting material 40 can be used to reinforce the cut beam material 30 without using the conventional hitting block.

In detail the connecting structure between the angle brace member 40 and Setsuhari member 30 with reference to FIG. 3, to accommodate the angle brace pivot bracket 42 of U-shaped cross section in the open space S in the _second side of the Setsuhari body 35, switching The bolt holes 37 of the first and second flanges 31 and 32 outside the beam body 35 and the bolt holes 43 of the fire-fitting bracket 42 can be connected by bolts 44 and nuts 45 as in the conventional case.

<4> Switching Hardware When described with reference to FIGS. 2 and 4, the switching hardware 50 is a hardware for switching the cross section of the beam member 30 to a small size, and a section steel 51 having an H-shaped section and one end of the section steel 51. A large end plate 55 that has a rectangular shape that is fixed to the other end of the shape steel 51 and a small end plate 56 that has a rectangular shape that is fixed to the other end of the shaped steel 51 are combined.
The side end surfaces of the section steel 51 having the H shape are integrally fixed to the side surfaces of the end plates 55 and 56 by welding or the like.

<4.1> Shape Steel The shape steel 51 is a steel material for transmitting axial force between the large end plate 55 and the small end plate 56, and a web is formed at the center of a pair of flanges 52, 53 having a rectangular shape. It is a steel material joined at 54. If a commercially available H-section steel is used for the section steel 51, the switching hardware 50 can be manufactured at low cost.
Each flange 52, 53 is formed with a plurality of bolt holes 52a, 53a along its longitudinal direction.

<4.2> Large end plate The large end plate 55 is a plate material for transmitting axial force between the switching hardware 50 and the beam member 30, and is welded to one end of the beam main body 35 to be integrated. It is fixed to.
A plurality of bolt holes 55 a are formed in the left and right side portions of the large end plate 55 protruding from the left and right sides of the shaped steel 51.

<4.3> Small end plate The small end plate 56 is a plate material for transmitting axial force between the switching hardware 50 and the jack 60 which is an incidental material, and is welded to the other end of the beam main body 35. It is fixed to one piece.
A plurality of bolt holes 56 a are formed on the left and right sides of the small end plate 56.
The small end plate 56 has the same vertical and horizontal dimensions (height and width) as the section steel 51.

<4.4> Direction of shape steel In order to maximize the cross-sectional performance of the shape steel 51 which is a stress transmission member, the end faces of the pair of flanges 52 and 53 of the shape steel 51 and the web 54 are brought into contact with the end plates 56. Use in contact.
That is, in this example, the web 54 of the shaped steel 51 is in a parallel relationship with the web 33 of the beam member 30.

<4.5> Dimensional Relationship between Cut Beam Material and Switching Hardware The height of the cutting beam material 30 and the switching hardware 50 is the same.
That is, the height of the end plate 38 of the beam member 30 is equal to the height of the structural steel 51, the large end plate 55, and the small end plate 56 constituting the switching hardware 50.

The lateral width of the large end plate 55 of the switching hardware 50 is the same as the lateral width of the end plate 38 of the beam member 30.
The widths of the section steel 51 and the small end plate 56 of the switching hardware 50 are equal.
Both the width of the shaped steel 51 and the small end plate 56 are smaller than the width of the large end plate 55.
In short, the pressure receiving area of the large end plate 55 constituting the switching hardware 50 is equal to the pressure receiving area of the end face of the beam member 30, and the pressure receiving area of the small end plate 56 is smaller than the pressure receiving area of the large end plate 55. I just need it.

<4.6> Reinforcement structure of switching hardware Since a large axial force acts on the switching hardware 50, it is preferable to reinforce the switching hardware 50.
Referring to FIG. 5, the reinforcing structure of the switching hardware 50 will be described. FIG. 5A shows that a reinforcing steel stiffener 57 is integrally attached to both sides of the web 54 in parallel with the flanges 52, 53. A reinforced structure is shown, and (B) and (C) in the figure show a structure in which the joint between the large end plate 55 and the flanges 52 and 53 is reinforced.
Both ends of the stiffener 57 in FIG. 5A are also joined to the opposing surfaces of the large end plate 55 and the small end plate 56.
(B) of the figure shows a structure in which a substantially triangular reinforcing plate 58 is attached between the large end plate 55 and a part of each of the flanges 52, 53, and (C) of FIG. , 53, and a reinforcing plate 59 having an elongated triangular shape is attached and reinforced.
These reinforcing structures are not essential and may be omitted, or a plurality of reinforcing structures may be combined.

<5> Jack In this example, the case where the incidental material is the jack 60 will be described.
The jack 60 is a pressure-type or screw-type jack, and is interposed, for example, between the belly material 20 and the switching hardware 50.

<6> Arrangement Example of Cut Beam Type Support Construction An example of a cut beam type support construction using the cut beam material 30 and the switching hardware 50 will be described.

<6.1> Installation of Switching Hardware Referring to FIG. 5, in order to attach the switching hardware 50 to one end of the cross beam 30 having a horizontally long cross section, the large switching hardware 50 is attached to the end plate 38 of the beam 30. The end plate 55 side is brought into contact with each other, and the plates 38 and 55 are connected by a plurality of bolts.
By connecting the switching hardware 50 to one end of the beam member 30, the switching hardware 50 is positioned on the center line of the beam member 30.

<6.2> Installation of Jack Referring to FIG. 6, a known jack 60 is interposed between the belly raising material 20 and the small end plate 56 of the switching hardware 50.
Since the switching hardware 50 is attached to the end face of the cut beam material 30 and the cross-sectional area of the cutting beam material 30 can be switched to a small size, a known jack 60 is provided at the center of the switching hardware 50 to provide a large cross-section cutting beam. A preload can be introduced into the material 30. In other words, it is not necessary to interpose a total of two jacks corresponding to each of the shape steels 30A and 30B, and the compressive force can be applied to the beam member 30 with one jack 60.

Considering the transmission efficiency of the axial force (compression force) by the switching hardware 50, the section steel 51 constituting the switching hardware 50 is arranged in the same direction with respect to the axial direction of the beam member 30.
The cross section that the switching hardware 50 resists is the entire cross section (the flanges 52 and 53 and the web 54) of the section steel 51. Therefore, not only can the axial force be transmitted efficiently through the entire section steel 51, but also the compression strength of the switching hardware 50. Becomes much higher.
In particular, when the switching hardware 50 has the stiffener 57 and the reinforcing plates 58 and 59 shown in FIG. 5, the transmission efficiency of the axial force by the switching hardware 50 is further improved.

<6.3> Installation of fire hitting material A known fire hitting material 40 is disposed between the flank material 20 and the side surface of the beam member 30, and a bolt is attached to the side surface of the beam member 30 via the fire receiving bracket 42. Can be linked.
In more detail with reference to FIG. 3, a fire catching bracket 42 having a U-shaped cross section is accommodated in the open space S ₂ on the side of the beam main body 35, and the first and second flanges 31 on the outer side of the beam main body 35. , 32 and the bolt hole 43 formed in the fire hitting metal fitting 42 are aligned, and the beam main body 35 and the fire hitting metal fitting 42 can be connected by bolting.
In the cut beam type supporting work of this example, the known beam hitting material 40 can be used to reinforce the cut beam material 30 without using a conventional hitting block.

<7> Combination with other incidental materials Although the above description has been given of the mode in which the jack 60 is disposed on the beam member 30 via the switching hardware 50, the incidental material is not limited to the jack 60.
7 and 8 illustrate other incidental materials.
FIG. 7 shows a case where the flank member 20 and the beam member 30 are in a non-right angle relationship. In such a case, a known extended steel member 61 and a known member are provided between the flank member 20 and the switching hardware 50. The free fire receiving piece 62 is interposed. Even if a large dimensional difference occurs between the beam member 30 and the free fire receiving piece 62, the dimensional difference can be eliminated by interposing the switching hardware 50, and the known free fire receiving piece 62 is used. Can do.
FIG. 8 shows a case where a conventional small cross-section beam material 63 is disposed on an extended line of the large cross-section beam material 30, and the conventional cross-beam material 63 is a generally used H-section steel. It is a beam material made of steel or square steel pipe.
Even if there is a difference in the cross-section between the two beam members 30, 63, a cut-off beam member 30 having a different cross-sectional dimension and a known beam member are provided by interposing a switching hardware 50 in order to eliminate the cross-sectional difference between them. 63 can be used in combination.
When the beam members 30 and 63 having different cut surface dimensions are used in combination, the beam member 30 having a large cross-sectional performance is used in a branch having a long buckling length, and the conventional beam member 63 has a buckling length that can be accommodated. Used in the section.

<8> Other Switching Hardware The switching hardware 50 can be configured by rotating 90 ° around the axis of the shape steel 51.
Referring to FIG. 9, the switching hardware 50 of this example is configured by placing a section steel 51 having an H-shaped cross section between a pair of end plates 55 and 56 having different sizes.
That is, in this example, the web 54 of the shaped steel 51 is in a relationship orthogonal to the web 33 of the beam member 30.
Even in the switching hardware 50 of this example, the pair of flanges 52 and 53 and the web 54 function integrally as a transmission member for the axial force.
In this example, a form in which the conventional beam member 63 is applied as an incidental material is shown, but the various incidental materials described above can be applied.

S ₁ ··· Closed space for beam material S ₂ ··· Open space 10 for beam material ··· Yamato wall 20 · · · Raised material 30 ··· Cut beam material 31 ... 1st flange 32 ... 2nd flange 33 ... Web 35 ... Cut beam body 36 ... Partial weld 37 ... · Bolt hole 38 ··· End plate 40 ··················································· | Shaped steel 52, 53 ... Flange 54 ... Web 55 ... Large end plate 56 ... Small end plate 57 ... Stiffener 60 ... Jack

Claims (6)

A switching hardware for switching the cross-section of a large cross-section beam with a pair of H-sections arranged side by side,
A section steel having an H-shaped section;
A large end plate that is wider than the section steel and is secured to one end of the section steel;
A small end plate having the same width as the shape steel and fixed to the other end of the shape steel;
The shape steel is interposed between the large end plate and the small end plate facing each other so that the entire end face of the shape steel having an H shape can function as a stress transmission member,
The large end plate side is connected to an end face of a beam member,
Switching hardware for cut beams.   2. The shape steel according to claim 1, wherein the shape steel has an H-shaped cross section in which a pair of flanges are connected by a web, and the shape steel web is in a parallel relationship with a web of a beam. Switching hardware for cutting beams.   2. The shape steel according to claim 1, wherein the shape steel has an H-shaped cross section in which a pair of flanges are connected by a web, and the shape steel web is orthogonal to the web of the beam. Switching hardware for cutting beams.   4. The beam member according to claim 2, wherein a plurality of stiffeners are attached to both sides of the shaped steel web between the large end plate and the small end plate. Switching hardware. The switching metal fitting for a beam member according to claim 2, 3 or 4, wherein a plurality of reinforcing plates are attached between the large end plate and the flange . The beam member is composed of a pair of section steels having a flange and a web,
A cross-beam main body in which the cross-sectional shape in which the pair of shape steels are arranged side by side and fixed between the flanges by welding has a II shape,
Having a dimension capable of sealing the entire cross section of the beam main body, and comprising an end plate attached to an end of the beam main body,
A continuous closed space having a square cross section is formed in the center of the beam main body,
Groove-shaped open spaces are formed on both sides of the beam main body,
The end plate seals the closed space into a sealed structure;
Except for the closed space, a plurality of bolt holes are formed along the flange facing the open space of the beam main body,
The switching hardware of the beam material according to claim 1.

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