JP2018044325A - Short strut material and short strut type timbering - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a short strut material and short strut type timbering, which can lengthen an arrangement interval between the short strut materials by making cross-sectional performance of the short strut material high, and which enable a known brace material to be directly joined to a side surface of the short strut material.SOLUTION: A short strut material includes a short strut body 35 in which a pair of pieces of H-shaped steel is laterally juxtaposed and fixed by welding, and an end plate 38. The short strut body fc has a closed space Sthat is defined in its central part, and open spaces Sthat are formed in both side parts thereof. A plurality of bolt holes 37 are formed in outside parts of flanges 31 and 32 facing the open spaces Sof the short strut body 35.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a cutting beam technology having a rectangular closed space, and more particularly to a cutting beam material and a beam-type support that can directly use an H-shaped steel fire beam.

As a means to support mountain retaining walls such as sheet piles, abdominal lining material laid horizontally on the inner surface of the mountain retaining wall, a cut beam material laid between the opposite flank materials, and a erection material between the cross beam material and the abdominal material There is known a beam-type support structure that combines fire hitting materials.
In general, H-section steel is used for the flank material, the beam material, and the fire striking material, and they are connected to each other using a plurality of bolts (Patent Documents 1 and 2).

When the erection length is long, a square steel pipe is used instead of the H-section steel as the beam material.
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.
Since the cut-off beam material made of a square steel pipe has a plurality of bolt holes or the like drilled at its end or side surface, the corrosion resistance is impaired. difficult.
Patent Document 3 discloses that a fire-blocking block c having a substantially trapezoidal shape as a whole is interposed between an end portion of a beam member a made of a square steel pipe and an erection material b (FIG. 5).

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)

The conventional beam support technology has the following improvements.
<1> H-shaped steel beam members have limitations in the construction length and bearing strength.
<2> Since a square steel pipe cut beam cannot open a bolt hole, it is difficult to adjust the length by using H-shaped steel fired steel that can be easily adjusted in length by changing the main material length on the side. Is forced to use a large fire block.
<3> When the cut beam material is made of a square steel pipe, the internal maintenance cannot be performed, and if the internal beam is corroded or damaged, the entire cut beam material must be discarded.

  The present invention has been made in view of the above points, and the cross-sectional performance of the beam material is large, the arrangement interval of the beam material can be expanded, and a known fired material can be directly joined to the side surface of the beam material. The purpose is to provide beam and beam support.

The present invention is a beam material used for a beam support, comprising a pair of shape steels having a flange and a web. The pair of shape steels are arranged side by side and fixed between the flanges by welding. A cross-beam body having a cross-sectional shape exhibiting a II shape, and an end plate attached to an end of the cross-beam main body having a dimension capable of sealing the entire cross-section of the cross-beam main body, A continuous closed space having a square cross section is formed in the center, groove-shaped open spaces are formed on both sides of the beam main body, the end plate seals the closed space to form a sealed structure, and the closed Except for the space, a plurality of bolt holes are formed along the flange facing the open space of the beam main body.
In another embodiment of the present invention, the flanges of the pair of shaped steels that are abutted are joined to each other by partial welding.
In another embodiment of the present invention, the pair of section steels are H-section steels.
In another embodiment of the present invention, a plurality of bolt holes are formed on the periphery of the end plate.
The present invention relates to an abdominal material horizontally laid on a mountain wall, a cut beam material disposed in a direction orthogonal to the abdominal material, and a fire striking material disposed obliquely between the abdominal material and the beam material. A beam support system comprising any of the above-described beam members, wherein the fire hitting material comprises a H-shaped steel hitting body, and a hitting metal fitting connected to both ends of the hitting body. The cut beam member and the fire catcher are connected by bolts in a state where the fire striker is accommodated in an open space on the side of the beam member.
In another embodiment of the present invention, the apparatus further includes a jack interposed between the flank material and the beam member in addition to the flank material, the beam material, and the fired material, and straddles the ends of the pair of shape steels. A jack is positioned in the center of the attached end plate.

The present invention has the following effects.
<1> Increase the cross-sectional performance of the beam material compared to H-section steel alone or square steel pipe by welding a pair of shape steel so that the cross-sectional shape of the beam material exhibits II shape. Can do.
Therefore, the arrangement interval of the cut beam material can be expanded as compared with the conventional case.
<2> It is possible to attach metal fittings using a plurality of bolt holes formed along the flange facing the open space of the beam member.
Therefore, it is possible to directly join a well-known hitting material to the side surface of the beam member while maintaining the sealing property of the closed space formed at the center of the beam member.
<3> A support structure can be reasonably assembled using a known fired material mainly composed of H-shaped steel without using a fired block that is difficult to adjust in length because of its complicated structure.
<4> Along with joining the flanges of a pair of section steels so as to be separable by partial welding, the pair of section steels were separated as needed to facilitate the maintenance of the inside of the cut beam body, as well as damage. It is easy to replace the shape steel.
<5> Since a commercially available H-section steel can be used for the shape of the beam, the beam can be manufactured at a low cost.
<6> When jacks are installed in the cut beam material, there is no need to use a total of two jacks corresponding to each shape steel, and the center position of the end plates attached across the ends of the pair of shape steels It is possible to introduce a preload to the beam material by interposing one jack.

Perspective view of a beam-type support according to the present invention Assembly drawing of the end of the beam Sectional view of the joint between the beam material and the fire-fitting bracket Plane explanatory drawing of an assembly example of a beam-type support Plane explanatory drawing of conventional beam-type support

  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 includes a known earth retaining structure such as an underground wall in addition to the illustrated steel sheet pile.
On the inner side surface of the mountain retaining wall 10, an H-shaped steel bell-raised material 20 is horizontally mounted.
The beam-type supporter includes a beam member 30 disposed in a direction orthogonal to the flank member 20, and a fire striking member 40 disposed obliquely between the flank member 20 and the beam member 30.
In FIG. 1, the illustration of one of the striking materials 40 is omitted.

<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 attached to the end of the beam main body 35 is provided.

<2.1> Cut Beam Main Body The cut beam main body 35 is formed by joining a pair of section steels 30A and 30B so that the cross-sectional shape exhibits “II type”.
Each of the section steels 30A and 30B has the same shape and the same dimension including the upper second flanges 31 and 32 and the web 33 connecting the upper second flanges 31 and 32. It 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.
The cross-beam main body 35 has a II-shaped cross-section, and thus has a larger cross-sectional performance (resistant to bending and buckling) than 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. It is conceivable to use a cover plate that can be covered between them, but it is also possible to join the bolts. However, since a support plate and a large number of bolts are required, the amount of steel used increases, resulting in an increase in weight and 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.
In this example, both shape steels 30A and 30B can be joined without using a splicing plate and a large number of bolts, so that the problem of weight increase 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.
A closed space S ₁ of Setsuharizai 30 by fully sealing of can effectively suppress corrosion of the internal Setsuharizai 30.
Further, since one end plate 38 is provided across the pair of structural steels 30A and 30B, when a hydraulic or screw type jack is interposed at the end of the beam member 30, each structural steel 30A, It is not necessary to interpose a total of two jacks corresponding to 30B, and a preload can be introduced into the beam member 30 by interposing one jack at the center position of the end plate 38.

<2.2.2> plurality of bolt holes 39 in the periphery of the end plate 38 facing away from the bolt hole closed space S ₁ is formed.

<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 fire hitting body 41 and the fire hitting metal fitting 42.
The hitting material 40 can be used as long as it is a known hitting beam mainly made of H-shaped steel.

<4> Arrangement Example of Cut Beam Type Supporting Works When an example of the cut beam type supporting work illustrated in FIG. 4 is described, an H-shaped steel uprising material 20 is horizontally mounted on the inner side surface of the mountain retaining wall 10. .
The beam members 30 described above are laid across a predetermined arrangement interval P in the orthogonal direction of the flank member 20.
At this time, the end face of the beam member 30 is brought into contact with the belly member 20.

<4.1> Bolt connection between side face of fired beam material and fire hitting material In the cut beam type support work of this example, the known fire hitting material 40 is used without using the conventional fire hitting block, and the beam 30 Can be reinforced.
That is, 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 the fire hitting bracket 42 with a bolt.

Referring to FIG. 3, a fire-fitting bracket 42 having a U-shaped cross section is accommodated in the open space S <b> ₂ on the side of the beam main body 35. The bolt hole 37 formed in the first and second flanges 31 and 32 outside the beam main body 35 is aligned with the bolt hole 43 formed in the fire receiving bracket 42, the bolt 50 is inserted, and the nut 51 is fastened. By doing so, one end of the fire striking material 40 can be directly connected to the side surface of the beam member 30 using the bolt 50.

<4.2> Arrangement Interval of Cut Beams The cut beam material 30 having a II-shaped cross section has a larger cross-sectional performance than an H-shaped steel alone or a square steel pipe alone. The arrangement interval P of the material 30 can be greatly expanded.

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 ······················································ |

Claims (6)

It is a beam material used for the beam support work,
It consists of a pair of shape steels having a flange and a web, and a cross beam body in which the cross-sectional shape in which the pair of shape steels are juxtaposed in the lateral direction and fixed between the flanges by welding exhibits 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,
Cut beam material.   The cross beam material according to claim 1, wherein the flanges of the pair of shape steels butted together are detachably joined by partial welding.   The beam member according to claim 1 or 2, wherein the pair of section steels are H-section steels.   The cross beam material according to claim 1, wherein a plurality of bolt holes are formed in a peripheral edge of the end plate. It includes a belly material horizontally laid on the mountain retaining wall, a cut beam material arranged in a direction orthogonal to the belly material, and a fire striking material arranged diagonally between the belly material and the beam material. A beam-type support,
Using the beam material according to any one of claims 1 to 4,
The fire hitting material comprises a fire hitting body made of H-shaped steel, and a hitting metal fitting connected to both ends of the fire hitting body,
In the state where the fire strut bracket is accommodated in the open space on the side of the cut beam member, the strut member and the fire strut bracket are connected by a bolt,
Cut beam type support work.   It further includes a jack interposed between the abdomen and the cut beam material, characterized in that the jack is positioned at the center of the end plate provided across the ends of the pair of shape steels, The beam supporting structure according to claim 5.

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