JP4804117B2 - Steel beam reinforcement hardware and its construction method - Google Patents

Description

  The present invention relates to a steel beam reinforcing hardware used for reinforcing a steel beam in which a through hole is formed in a web, and a construction method thereof.

  Examples of conventional steel beam reinforcing hardware include those shown in FIGS. 4 and 5 (see Patent Document 1). In the figure, a circular through hole 3 is formed in the web 2b between a pair of upper and lower flanges 2a of the steel beam 2 in the figure, and the steel beam is reinforced at the edge of the web 2b forming the periphery of the through hole 3. The hardware 1 is fixed.

  The steel beam reinforcing hardware 1 is formed in an annular shape having a center hole 1a, and a plurality of sets of outer peripheral portions of a thick portion inside the radius are fitted into the through holes 3 of the steel beam 2. Via the bolt 15, the nut 7 and the washer 10 of each of the screw fastening means 25, the radially outer portion of the steel beam reinforcing metal 1 is fixed to the web 2b.

  As shown in FIG. 6, the shaft portion 15 a of the bolt 15 is inserted into a bolt insertion hole 1 b opened in the reinforcing hardware 1 and a bolt insertion hole 2 c opened in the web 2 b of the steel beam 2. For this reason, the insertion hole 1b and the insertion hole 2c are formed so that the thickness of the reinforcement metal 1 and the web 2b may be penetrated coaxially.

  As described above, the conventional steel beam reinforcing hardware 1 is attached to the web 2b by the screw fastening means 25 using the bolts 15, the nuts 7 and the like, so that it does not require skill as compared with the case where it is attached by welding. Anyone can easily attach the reinforcing hardware 1 to the web 2b regardless of the weather and season.

Such a conventional steel beam reinforced hardware 1 is configured such that piping, ducts (not shown), etc., such as air conditioning facilities and water supply / drainage facilities of buildings can be passed through the center hole 1a. And the reinforcement | strengthening metal object 1 is attached to the web 2b of the steel beam 2 in which the through-hole 3 was formed, The strength of the steel beam 2 which the through-hole 3 was formed and fell is reinforced.
JP 2003-232077 A

  However, in the conventional steel beam reinforcing hardware 1, as shown in FIG. 6, the circumferential surface forming the bolt insertion hole 1b through which the shaft portion 15a of the bolt 15 passes, and the web through which the shaft portion 15a of the bolt 15 passes. There is a clearance G that is normally set between each of the peripheral surfaces forming the bolt insertion holes 2 c of 2 b and the peripheral surface of the shaft portion 15 a of the bolt 15.

  For this reason, when stress due to a load such as an earthquake is applied to the steel beam 2, as shown in FIG. 7, the peripheral surface of the shaft portion 15a of the bolt 15 is a bolt insertion hole 1b of the steel beam reinforcement hardware 1 and the web 2b. , 2c until they come into contact with each other on the circumferential surfaces facing each other, slip occurs between the contact surfaces of the steel beam reinforcing metal 1 and the web 2b, and only the sliding friction force acts during the sliding operation. The resistance to was hardly exhibited.

  As shown in FIG. 7, the circumferential surfaces of the bolt insertion holes 1b, 2c facing each other are in contact with the opposite sides of the circumferential surface of the shaft portion 15a of the bolt 15, and the steel beam reinforcing hardware 1 and the web 2b When the sliding motion between the respective contact surfaces of the steel frame ends, the steel beam reinforcing hardware 1 and the web 2b continue to move relative to each other in opposite directions A and B. A shearing force F acting in a direction perpendicular to the length direction of the shaft portion 15a acts as a resistance force against stress caused by a load such as an earthquake.

  For this reason, during the period from when the stress is applied to the steel beam 2 until the resistance to the stress is generated, that is, during the sliding motion between the steel beam reinforcing hardware 1 and the web 2b, Since resistance does not work, deformation of the steel beam 2 due to stress cannot be prevented. For this reason, during the period from when the stress is applied to the steel beam 2 to when the resistance to the stress is generated, the steel beam 2 is deformed, so that a structural frame (not shown) is assembled. )), And there is a risk that the entire structural framework may be destroyed.

  Accordingly, in view of the above problems, the present invention provides a steel beam reinforcing metal fitting and a method for constructing the same, which can generate a resistance force to the stress immediately after the stress due to a load such as an earthquake acts on the steel beam. It is an object to do.

In order to solve the above problems, the present invention
A steel beam reinforcing hardware for reinforcing a through hole formed in a steel beam web,
A shaft portion of a screw fastening means that is attached to the edge of the web around the through-hole, has a center hole, and coaxially penetrates the thickness of the web and the reinforcement hardware to fasten the web and the reinforcement hardware. An insertion hole through which is inserted is formed,
A gap change limiting member capable of limiting expansion and contraction and bias of the gap even when stress is applied to the steel beam in the gap between the circumferential surface forming the insertion hole and the circumferential surface of the shaft portion. provided, as the gap change restriction member, is characterized in that using the cylindrical member so as to deform in the gap by engagement operation of the screw fastening means.

In the present invention, the cylindrical member bulges the substantially central portion in the length direction outward in the radial direction.
It is characterized by being deformed so that

The cylindrical member according to the present invention has a substantially central portion in the length direction outside the radial direction in advance.
It is characterized by being formed to bulge to the side .

Further, in order to solve the above problems, the present invention
A steel beam reinforcing hardware for reinforcing a through hole formed in a steel beam web,
A shaft portion of a screw fastening means that is attached to the edge of the web around the through-hole, has a center hole, and coaxially penetrates the thickness of the web and the reinforcement hardware to fasten the web and the reinforcement hardware. An insertion hole through which is inserted is formed,
A gap change limiting member capable of limiting expansion and contraction and bias of the gap even when stress is applied to the steel beam in the gap between the circumferential surface forming the insertion hole and the circumferential surface of the shaft portion. Provided,
As the gap change limiting member, a cylindrical member that fits in the gap almost without gap by the fastening operation of the screw fastening means is used .

In order to solve the above problems, the present invention
A method for constructing a steel beam reinforcing hardware that reinforces a through-hole formed in a steel beam web,
The steel beam reinforcing hardware is attached to the edge of the web around the through hole, a center hole is formed, and the web and the reinforcing hardware are fastened coaxially through the thickness of the web and the reinforcing hardware. An insertion hole through which the shaft portion of the screw fastening means to be inserted is formed,
A gap change limiting member capable of limiting expansion and contraction and bias of the gap even when stress is applied to the steel beam in the gap between the circumferential surface forming the insertion hole and the circumferential surface of the shaft portion. Provided,
As the gap change limiting member, a cylindrical member that is deformed in the gap by the fastening operation of the screw fastening means is used .

In order to solve the above problems, the present invention
A method for constructing a steel beam reinforcing hardware that reinforces a through-hole formed in a steel beam web,
The steel beam reinforcing hardware is attached to the edge of the web around the through hole, a center hole is formed, and the web and the reinforcing hardware are fastened coaxially through the thickness of the web and the reinforcing hardware. An insertion hole through which the shaft portion of the screw fastening means to be inserted is formed,
A gap change limiting member capable of limiting expansion and contraction and bias of the gap even when stress is applied to the steel beam in the gap between the circumferential surface forming the insertion hole and the circumferential surface of the shaft portion. Provided ,
As the gap change limiting member, a cylindrical member that fits in the gap almost without gap by the fastening operation of the screw fastening means is used .

According to such a steel beam reinforcing metal fitting of the present invention,
A steel beam reinforcing hardware for reinforcing a through hole formed in a steel beam web,
A shaft portion of a screw fastening means that is attached to the edge of the web around the through-hole, has a center hole, and coaxially penetrates the thickness of the web and the reinforcement hardware to fasten the web and the reinforcement hardware. An insertion hole through which is inserted is formed,
A gap change limiting member capable of limiting expansion and contraction and bias of the gap even when stress is applied to the steel beam in the gap between the circumferential surface forming the insertion hole and the circumferential surface of the shaft portion. By providing
A resistance force against the stress can be generated immediately from the beginning when the stress due to the load such as an earthquake is applied to the steel beam.

  Further, as the gap change limiting member, a cylindrical member that is deformed in the gap by the fastening operation of the screw fastening means is used, so that the cylindrical member deformed in the gap restricts expansion / contraction or bias of the gap. Therefore, it is possible to generate a resistance force against the stress immediately after the stress due to the load such as an earthquake is applied to the steel beam.

  Further, the cylindrical member may be deformed in the gap so that the substantially central portion in the length direction bulges outward in the radial direction, so that the deformed cylindrical member restricts expansion / contraction or bias of the gap. Therefore, a resistance force against the stress can be generated immediately after the stress due to the load such as an earthquake acts on the steel beam.

  Further, the cylindrical member is formed so that the substantially central portion in the length direction bulges outward in the radial direction in advance, so that the central portion of the length can be reliably deformed to bulge outward in the radial direction. Therefore, since the cylindrical member deformed in this way can limit expansion and contraction and bias of the gap, it is possible to generate a resistance force against this stress immediately after the stress due to a load such as an earthquake acts on the steel beam. it can.

  Further, as the gap change limiting member, a cylindrical member that is fitted with almost no gap in the gap by the fastening operation of the screw fastening means is used. Since the expansion and contraction and the bias of the gap can be restricted, a resistance force to the stress can be generated immediately from the beginning when the stress due to the load such as an earthquake is applied to the steel beam.

Moreover, according to the construction method of the steel beam reinforcing hardware of the present invention,
A method for constructing a steel beam reinforcing hardware that reinforces a through-hole formed in a steel beam web,
The steel beam reinforcing hardware is attached to the edge of the web around the through hole, a center hole is formed, and the web and the reinforcing hardware are fastened coaxially through the thickness of the web and the reinforcing hardware. An insertion hole through which the shaft portion of the screw fastening means to be inserted is formed,
A gap change limiting member capable of limiting expansion and contraction and bias of the gap even when stress is applied to the steel beam in the gap between the circumferential surface forming the insertion hole and the circumferential surface of the shaft portion. By providing
A resistance force against the stress can be generated immediately from the beginning when the stress due to the load such as an earthquake is applied to the steel beam.

BEST MODE FOR CARRYING OUT THE INVENTION The best mode for carrying out a steel beam reinforcing metal fitting and its construction method according to the present invention will be specifically described below with reference to the drawings.
1 and 2 are views referred to for explaining a steel beam reinforcing metal fitting and its construction method according to the first embodiment of the present invention. The same parts as those in the prior art will be described using the same reference numerals, and overlapping description of the same configurations as those in the prior art shall be omitted.

  In the first embodiment of the present invention, as shown in FIG. 1, the insertion holes 1b and 2c defined in the thicknesses of the steel beam reinforcing hardware 1 and the web 2b through which the shaft portion 15a of the bolt 15 passes are provided. A cylindrical member 16 (gap change limiting member) is provided in a gap between the circumferential surface forming (see FIG. 6) and the circumferential surface of the shaft portion 15a.

  The cylindrical member 16 has strength and elasticity necessary for exhibiting the functions intended by the present invention, which will be described later. As a material of the cylindrical member 16, for example, a metal such as a steel material or aluminum can be used. However, it is not necessary to limit the material to the metal as long as it can exhibit the above function, and other materials may be used.

  As shown in FIG. 2, the length of the cylindrical member 16 is increased by the thickness of the reinforcing hardware 1 and the web 2b before the bolt 15 and the nut 7 are clamped by sandwiching the steel beam reinforcing hardware 1 and the web 2b. It is longer than the value. Therefore, when the nut 7 is only lightly screwed to the screw portion 15b of the bolt 15, the end portion 16a of the cylindrical member 16 is slightly exposed to the outside in the axial direction of the gap as shown in FIG. It becomes a state.

  In this state, when the nut 7 is strongly tightened to the threaded portion 15b of the bolt 15, the end portion 16a of the cylindrical member 16 is pushed into the gap and the length of the cylindrical member 16 as shown in FIG. The central portion 16b is swelled outward in the radial direction so that the outer diameter is increased.

  When the cylindrical member 16 is deformed in this way, the outer peripheral surface of the central portion 16b is strongly pressed against the peripheral surfaces of the insertion holes 1b and 2c, and the inner peripheral surfaces at both ends of the cylindrical member 16 are axial portions as a reaction. Since it will be in the state pressed strongly by the surrounding surface of 15a, the cylindrical member 16 functions so that the expansion / contraction and bias | inclination of the said clearance gap may be restrict | limited.

  That is, since the cylindrical member 16 functioning in this way is in the gap, it becomes difficult to widen or shrink the gap, and as a result, the size of the gap depends on each position around the axis of the shaft portion 15a. It is possible to prevent the occurrence of bias that changes.

  In addition, the cylindrical member 16 in this Embodiment is formed in the state where the center part of the length direction is slightly bulging from before even if the force which compresses this in the length direction is not applied. .

  According to the first embodiment of the present invention as described above, the peripheral surfaces of the insertion holes 1b and 2c defined in the respective thicknesses of the steel beam reinforcing hardware 1 and the web 2b and the peripheral surface of the shaft portion 15a. By providing the cylindrical member 16 having the shape and function as described above in the gap between them, if there is no gap between the peripheral surface of the insertion holes 1b and 2c and the peripheral surface of the shaft portion 15a, the same state is obtained. Therefore, expansion / contraction and bias of the gap can be restricted.

  For this reason, when stress due to a load such as an earthquake is applied to the steel beam 2, the contact surface between the reinforcement hardware 1 and the web 2b of the steel beam 2 is slipped by a gap around the bolt shaft portion 15a. Such a thing does not happen.

  Therefore, a resistance force against the stress can be generated immediately from the initial stage when the stress due to a load such as an earthquake is applied to the steel beam 2. That is, a large shearing force acting in a direction perpendicular to the length direction of the shaft portion 15a of the bolt 15 as a reaction force due to the force that the reinforcing metal 1 and the web 2b try to move relative to each other in the opposite directions acts (FIG. 6). Can be generated).

  As described above, since the resistance force to the stress can be generated immediately from the initial stage when the stress due to the load such as an earthquake is applied to the steel beam 2, the deformation of the steel beam 2 due to the stress caused by the load such as an earthquake can be reduced. Further, it is possible to prevent deformation and destruction of the entire structural frame in which the steel beam 2 and the column are assembled.

  Further, according to the present embodiment, the cylindrical member 16 is deformed by forming the central portion of the cylindrical member 16 in a bulging outward direction in the radial direction before the cylindrical member 16 is deformed. It is possible and easy to deform the center part of the length so as to bulge outwardly.

  FIG. 3 is a view referred to for explaining a steel beam reinforcing metal fitting and a construction method thereof according to the second embodiment of the present invention.

  In the first embodiment, the space between the peripheral surfaces of the insertion holes 1b and 2c (see FIG. 6) opened in the respective thicknesses of the steel beam reinforcing hardware 1 and the web 2b and the peripheral surface of the shaft portion 15a. The cylindrical member 16 that is deformed in the gap during the fastening operation of the screw fastening means 25 is provided in this gap, whereas in the second embodiment, the fastening operation of the screw fastening means 25 is performed. This is different in that a cylindrical member 18 (gap change limiting member) is provided in the gap so as to be fitted with almost no gap.

  That is, in the second embodiment, the cylindrical member 18 is provided without a gap in the gap between the circumferential surface of the insertion holes 1b and 2c and the circumferential surface of the shaft portion 15a. Although not deformed unlike the cylindrical member 16 of the first embodiment, when a stress due to a load such as an earthquake is applied to the steel beam 2 after the fastening operation of the screw fastening means 25, the gap is expanded or contracted or biased. It works to limit.

  That is, when such a cylindrical member 18 is in the gap between the circumferential surface of the insertion holes 1b and 2c and the circumferential surface of the shaft portion 15a, it becomes difficult to widen or shrink the gap. As a result, it is possible to prevent a deviation in which the dimension of the gap changes depending on each position around the axis of the shaft portion 15a.

  According to the second embodiment of the present invention, since the cylindrical member 18 is provided without a gap in the gap between the peripheral surface of the insertion holes 1b and 2c and the peripheral surface of the shaft portion 15a, Since the expansion and contraction and the bias of the gap can be limited, a resistance force against the stress can be generated immediately from the beginning when the stress due to the load such as an earthquake is applied to the steel beam 2.

  For this reason, the deformation of the steel beam 2 due to the stress caused by the load such as an earthquake can be prevented, and further, the deformation of the structural frame in which the steel beam 2 and the column are assembled and the destruction of the entire structural frame can be prevented. it can.

  In the above-described embodiment, the case where the steel beam reinforcing hardware 1 formed of metal is fixed to the web 2b as a member for reinforcing the web 2b of the steel beam 2 in which the through holes 3 are formed is described. Any other material such as fiber reinforced plastic or fiber reinforced concrete may be used as such a reinforcing member instead of metal as long as it has the above strength.

Moreover, in the said embodiment, although the case where the through-hole 3 and the steel beam reinforcement metal fitting 1 etc. were formed in circular shape was demonstrated, they may be what was formed in what shape other than circular shape. Needless to say, it is good.

It is sectional drawing which shows the state which provided the cylindrical member 16 which concerns on the 1st Embodiment of this invention, and fixed the steel beam reinforcement metal fitting to the web. It is sectional drawing which shows the cylindrical member 16 in the state before it will be in the state in FIG. 1, ie, before the fastening operation | movement of the screw fastening means 25 is completed. It is sectional drawing which shows the state which provided the cylindrical member 18 which concerns on the 2nd Embodiment of this invention, and fixed the steel beam reinforcement metal fitting to the web. It is sectional drawing which shows the state which fixed the conventional steel beam reinforcement metal fitting to the web. It is the AA arrow directional view of the steel beam reinforcement metal fitting and web in FIG. FIG. 5 is an enlarged cross-sectional view around a bolt 15 in FIG. 4. It is an expanded sectional view which shows the changed state of the volt | bolt 15 periphery in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Steel beam reinforcement 1a Center hole 1b Bolt insertion hole 2 Steel beam 2a Flange 2b Web 2c Bolt insertion hole 3 Through hole 7 Nut 10 Washer 15 Bolt 15a Shaft part 15b Bolt screw part 16 Cylindrical member 18 Cylindrical member 25 Screw fastening means

Claims (6)

A steel beam reinforcing hardware for reinforcing a through hole formed in a steel beam web,
A shaft portion of a screw fastening means that is attached to the edge of the web around the through-hole, has a center hole, and coaxially penetrates the thickness of the web and the reinforcement hardware to fasten the web and the reinforcement hardware. An insertion hole through which is inserted is formed,
A gap change limiting member capable of limiting expansion and contraction and bias of the gap even when stress is applied to the steel beam in the gap between the circumferential surface forming the insertion hole and the circumferential surface of the shaft portion. A steel beam reinforcing metal fitting is provided , wherein a cylindrical member that deforms in the gap by the fastening operation of the screw fastening means is used as the gap change limiting member . 2. The steel beam reinforcing hardware according to claim 1 , wherein the cylindrical member is deformed so that a substantially central portion in the length direction bulges outward in a radial direction. The steel beam reinforcing metal fitting according to claim 2 , wherein the cylindrical member is formed by bulging a substantially central portion in the length direction outward in the radial direction in advance. A steel beam reinforcing hardware for reinforcing a through hole formed in a steel beam web,
A shaft portion of a screw fastening means that is attached to the edge of the web around the through-hole, has a center hole, and coaxially penetrates the thickness of the web and the reinforcement hardware to fasten the web and the reinforcement hardware. An insertion hole through which is inserted is formed,
A gap change limiting member capable of limiting expansion and contraction and bias of the gap even when stress is applied to the steel beam in the gap between the circumferential surface forming the insertion hole and the circumferential surface of the shaft portion. Provided ,
A steel beam reinforcing metal fitting, wherein the gap change limiting member is a cylindrical member that fits into the gap almost without gap by the fastening operation of the screw fastening means . A method for constructing a steel beam reinforcing hardware that reinforces a through-hole formed in a steel beam web,
The steel beam reinforcing hardware is attached to the edge of the web around the through hole, a center hole is formed, and the web and the reinforcing hardware are fastened coaxially through the thickness of the web and the reinforcing hardware. An insertion hole through which the shaft portion of the screw fastening means to be inserted is formed,
A gap change limiting member capable of limiting expansion and contraction and bias of the gap even when stress is applied to the steel beam in the gap between the circumferential surface forming the insertion hole and the circumferential surface of the shaft portion. setting only, Examples gap change restriction member, the construction method of the steel beam reinforcement hardware, which comprises using a cylindrical member so as to deform in the gap by engagement operation of the screw fastening means. A method for constructing a steel beam reinforcing hardware that reinforces a through-hole formed in a steel beam web,
The steel beam reinforcing hardware is attached to the edge of the web around the through hole, a center hole is formed, and the web and the reinforcing hardware are fastened coaxially through the thickness of the web and the reinforcing hardware. An insertion hole through which the shaft portion of the screw fastening means to be inserted is formed,
A gap change limiting member capable of limiting expansion and contraction and bias of the gap even when stress is applied to the steel beam in the gap between the circumferential surface forming the insertion hole and the circumferential surface of the shaft portion. setting only, Examples gap change restriction member, substantially no gap construction method for steel beam reinforcement hardware, which comprises using a cylindrical member to fit in the gap by engagement operation of the screw fastening means.

Images