JP4413167B2 - Reinforced structure of steel reinforced concrete structure and its construction method - Google Patents

Description

  The present invention relates to a reinforcing structure for a beam through hole made of steel reinforced concrete (SRC) constructed by including a steel frame and a reinforcing bar in the concrete, and a method for its construction.

  As shown in FIG. 6, a beam 20 provided between a pair of adjacent columns 10 and 10 is provided with a gap in the length direction, and the beam 20 is arranged in the front-rear direction (width direction in the figure). A plurality of through-holes 14 are formed, and such through-holes 14 can be used to pass air-conditioning facilities of buildings, pipes and ducts (not shown) of water supply / drainage facilities, and the like. .

  When the through-hole 14 is formed in the beam 20 in this way, the strength of the beam 20 is thereby reduced, and thus the reduced strength needs to be reinforced. In this way, the reduced strength of the beam 20 is reinforced. A conventional reinforcing structure of a steel reinforced concrete structure material will be described below with reference to the drawings (see Non-Patent Document 1).

  FIGS. 7 to 9 show a cross section of a steel reinforced concrete (SRC) beam 20. In the concrete 22 of the beam 20, in addition to the steel frame 24, reinforcing bars such as a beam main bar and a reinforcing bar are included. However, in order to prevent the drawings from becoming complicated, the reinforcing bars such as the beam main bars and the reinforcing bars are omitted in these drawings, and only the steel frame 24 is displayed.

  The beam 20 is provided by including a steel frame 24 using H-shaped steel in a concrete 22. In FIG. 7, a square steel plate 26 as shown in FIG. 8 is attached to both the front and back surfaces of the plate-like web 24a, which is displayed so as to extend in the vertical direction at the center in the left-right direction in the figure. The steel plate 26 is integrally fixed to the web 24a by welding the weld M on the entire circumference.

  As shown in FIG. 7, holes of the same diameter communicating with each other are provided in the central portions of the web 24a of the steel frame 24 and the steel plate 26, and the holes penetrate through the concrete 22 over its entire length. A steel pipe 28 is inserted. As shown in the figure, the steel pipe 28 is fixed around the holes of the two steel plates 26 by welding the welded portion M on the outer peripheral surface of the central portion in the length direction.

In the concrete 22 at a position slightly apart in the axial direction (left and right direction in the figure) of the steel pipe 28 from each surface of the two steel plates 26 attached to the front and back surfaces of the web 24a shown in FIG. As shown in the drawing, a plurality of opening reinforcing bars 27 are arranged so as to surround the steel pipe 28 at a distance slightly outward from the steel pipe 28. Four opening reinforcing bars 27 are arranged in a cross beam shape, and one opening reinforcing steel bar 27 is arranged obliquely at four corners of the cross beam.
“Structural Steel Design Standards and Explanations” (1998 edition)

  However, in the conventional reinforcing structure of a steel reinforced concrete structure, the steel plates 26 are welded to both the front and back surfaces of the web 24a of the steel frame 24 in order to reinforce the strength reduction due to the through holes 14 of the beam 20. Further, since the steel pipe 28 of the beam 20 extending over the entire width of the concrete 22 is inserted into the hole of the web 24a and the steel plate 26 and the steel pipe 28 is joined to the steel plate 26 by welding, the web 24a of the steel frame 24, There were many welding locations between the steel plate 26 and the steel pipe 28.

  For this reason, there has been a problem that the construction of the reinforcing structure of the steel-framed reinforced concrete structural material takes a great number of construction steps and construction time, resulting in a significant construction cost increase.

  Further, in the conventional reinforcing structure of steel reinforced concrete structural material, since the welding between the web 24a of the steel frame 24 and the steel plate 26 and the steel pipe 28 is performed in the factory, as shown in FIG. Both ends of the steel beam 24 protrude outward beyond the width of the flange 24c of the steel frame 24, and the bulky steel beam member must be transported to the site. There was a problem that the transfer operation could not be performed efficiently.

  Therefore, in view of the above problems, the present invention can significantly reduce the construction cost by reducing the number of welding construction sites, and efficiently carry out the work of conveying steel beam members from the factory to the site. It is an object of the present invention to provide a reinforcing structure for a steel reinforced concrete structure material and a construction method thereof.

In order to solve the above problems, the reinforcing structure of the steel reinforced concrete structure material according to the present invention is:
In a steel-framed reinforced concrete structure material in which a building structure material is constituted by a steel-framed reinforced concrete in which a steel frame having a flange portion and a reinforcing bar are encapsulated in the concrete, and through holes are formed in the width direction of the structural material,
A fitting part fitted into a hole provided in the steel frame is welded to the steel frame, and a steel frame reinforcing member having a shaft hole having a diameter substantially equal to or smaller than the diameter of the through hole,
A first thin-walled cylindrical member that is integrally provided only by fitting into the shaft hole of the steel frame reinforcing member, and whose axial length is shorter than the width of the flange portion of the steel frame; It is composed of a second thin-walled cylinder member that is slidably fitted and connected to the first thin-walled cylinder member along its axis , and functions as a concrete formwork of a through-hole formed in the structural material. Or a thin-walled cylinder member formed of a material having nonflammability and water resistance,
An opening reinforcing reinforcing bar included in the concrete is provided so as to surround the periphery of the thin-walled cylindrical member of the through hole.

    Further, in the reinforcing structure of a steel reinforced concrete structure material according to the present invention, the steel reinforcing member has a ring shape, and in a plane perpendicular to the axis of the through hole, a circle, an ellipse, a polygon, or a shape close thereto. It is characterized by being formed.

  Further, in the reinforcing structure for steel reinforced concrete structural material according to the present invention, the steel reinforcing member has a thin flange portion on the outer periphery thereof, and an inclined portion is formed in the fitting portion in an axial cross section thereof. It is characterized by.

Moreover, in order to solve the above-mentioned problem, the construction method of the reinforcing structure of the steel reinforced concrete structure material according to the present invention is:
In a steel-framed reinforced concrete structure material in which a building structure material is constituted by a steel-framed reinforced concrete in which a steel frame having a flange portion and a reinforcing bar are encapsulated in the concrete, and through holes are formed in the width direction of the structural material,
A fitting part fitted into a hole provided in the steel frame is welded to the steel frame, and a steel frame reinforcing member having a shaft hole having a diameter substantially equal to or smaller than the diameter of the through hole,
A first thin-walled cylindrical member that is integrally provided only by fitting into the shaft hole of the steel frame reinforcing member, and whose axial length is shorter than the width of the flange portion of the steel frame; It is composed of a second thin-walled cylinder member that is slidably fitted and connected to the first thin-walled cylinder member along its axis , and functions as a concrete formwork of a through-hole formed in the structural material. Or a thin-walled cylinder member formed of a material having nonflammability and water resistance,
A method of constructing a reinforcing structure of a steel-framed reinforced concrete structure material comprising an opening reinforcing steel bar enclosed in concrete so as to surround the thin-walled cylindrical member of the through hole,
The thin-walled cylinder member functioning as a concrete mold for the through-hole is attached to the steel reinforcing member in advance before placing the concrete, and does not need to be removed after the concrete is hardened.

  According to such a reinforcing structure of a steel reinforced concrete structure material of the present invention and its construction method, the construction cost is greatly reduced by reducing the number of construction steps and the construction time by reducing the number of construction sites for welding. In addition, it is possible to efficiently carry the steel beam member used for the steel reinforced concrete structural beam from the factory to the site.

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.
FIG. 1 to FIG. 5 are diagrams referred to for explaining a reinforcing structure of a steel reinforced concrete structure material according to an embodiment of the present invention and a construction method thereof. The same parts as those in the prior art will be described using the same reference numerals.

  FIG. 1 is a view showing a cross section of a beam 30 as a building structure material made of steel reinforced concrete (SRC) formed by placing concrete 22 in a concrete formwork 35. The steel-framed reinforced concrete beam 30 is provided with a steel frame 24 and a reinforcing bar 25 such as a beam main bar 25a and a reinforcing bar 25b disposed around the steel frame 24 in the concrete 22.

  A fitting portion of a steel reinforcing member 32 is fitted into a hole 24b (see FIG. 2) penetrating the web 24a of the steel frame 24 included in the concrete 22 of the beam 30, and this steel reinforcing member 32 is fitted. As shown in FIG. 2, the part is integrally fixed to the web 24 a of the steel frame 24 by welding the welded part M.

  The steel frame reinforcing member 32 is formed of forged steel manufactured by forging using a steel material or cast steel manufactured by casting. Further, as shown in FIG. 2, the shaft of the fitting portion of the steel reinforcing member 32 having a thin flange portion 32c on its outer periphery and having a fitting portion that fits into the hole 24b of the web 24a of the steel frame 24. An inclined portion 32a is formed in the cross section in the direction.

  Therefore, as shown in FIG. 2, a gap having a groove angle θ is formed between the peripheral surface of the hole 24b of the web 24a of the steel frame 24 and the inclined portion 32a that is the fitting portion of the steel frame reinforcing member 32. Therefore, as shown in FIG. 1, the steel frame reinforcing member 32 has a trapezoidal cross section in the axial direction. And welding is performed to the welding part M in the clearance gap of the groove angle (theta). The steel reinforcing member 32 is formed to have a thickness larger than the thickness of the web 24a of the steel frame 24.

  Further, as shown in FIG. 4, the steel frame reinforcing member 32 is formed in a circular shape on a plane orthogonal to the axis thereof. As shown in FIG. 2, the steel reinforcing member 32 is formed with a shaft hole 32b having a smaller diameter than the hole 24b of the web 24a. As shown in FIGS. 1 and 3, a thin cylindrical member 33 (a thin cylindrical member, a first thin cylindrical member) is fitted into the shaft hole 32b. The thin cylindrical member 33 is made of metal or a material having at least nonflammability and water resistance.

  Spiral steel pipes 37 (thin cylinder members, second thin cylinder members) as shown in FIG. 3 are fitted to both ends of the thin cylindrical member 33 so as to be slidable in the axial direction with respect to the thin cylindrical member 33 and connected. is doing. Therefore, by sliding the spiral steel pipe 37 in the axial direction with respect to the thin-walled cylindrical member 33, the end of the spiral steel pipe 37 opposite to the steel reinforcing member 32 is brought into contact with the inner surface of the concrete formwork 35 without a gap. Can be made.

  The spiral steel pipe 37 is formed by winding a strip-shaped thin steel plate in a spiral shape and joining the adjacent side parts thereof, and the joined part is joined by caulking, soldering, or the like. It has a high strength as.

  The end of the spiral steel pipe 37 opposite to the steel reinforcing member 32 is closed by a lid member 39 as shown in FIG. 3, and the steel steel reinforcing member is slightly closed from the end of the spiral steel pipe 37 closed by the lid member 39. As shown in FIG. 1, opening reinforcing bars 29 a and 29 b (concrete reinforcing bars) for reinforcing the concrete 22 are arranged around the position near 32.

In addition to the conventional opening reinforcing bar 27 shown in FIG. 9, the opening reinforcing bar is integrally formed like the opening reinforcing bar 29 shown in FIG. It has been known.
Such an opening reinforcing bar 29 is attached to a reinforcing bar such as a barb 25b by a wire or the like, but can also be directly attached and fixed to a spiral steel pipe 37 of a thin cylindrical member.

  When constructing the beam 30 as such a steel-framed reinforced concrete structural material, concrete is placed in a concrete form 35 for forming the beam 30. In one embodiment of the present invention, the concrete is placed. Before the placement, a thin cylindrical member 33 is provided in the shaft hole 32b of the steel frame reinforcing member 32 in advance.

  Along with this thin cylindrical member 33, spiral steel pipes 37 that are slidable in the axial direction with respect to this thin cylindrical member 33 are provided so as to be fitted to both ends of the thin cylindrical member 33, and these thin cylindrical member 33 and spiral steel pipe are provided. 37 has a function as a concrete mold for forming the through hole 14 of the beam 30 together with the concrete mold 35.

  As described above, when the thin-walled cylindrical member 33 and the spiral steel pipe 37 are disposed in advance at a position where the through-hole 14 is desired to be formed, and fluidized concrete is placed in the concrete mold 35, the thin-walled cylindrical member is formed after the concrete is hardened. The inner peripheral surfaces of the member 33 and the spiral steel pipe 37 form the through hole 14.

  Further, even though the thin cylindrical member 33 and the spiral steel pipe 37 have a function as a concrete mold, they are not removed after the concrete is hardened, and are left as a part of the beam 30 as they are.

  According to such a reinforcing structure of a steel reinforced concrete structure material and an execution method thereof according to an embodiment of the present invention, the number of welding work places does not increase as in the prior art. Since the construction time can be reduced, the construction cost can be greatly reduced.

  That is, the steel reinforcing member 32 provided on the web 24a of the steel frame 24 is formed of the forged steel or cast steel, and the thickness thereof can be formed to a thickness larger than the thickness of the web 24a. Have. For this reason, the strength of the web 24a and hence the strength of the steel frame 24 and the beam 30 are sufficiently reinforced without using the two steel plates 26 and the steel pipes 28 provided on the front and back of the web 24a of the steel frame 24 as used conventionally. can do.

  Further, as shown in FIG. 2, the place where welding is performed is mainly the position of the welded portion M between the web 24a of the steel frame 24 and the steel reinforcing member 32. Therefore, it is possible to reduce the number of welding construction points as compared with the conventional technique. As a result, it is possible to reduce the construction man-hours and construction time of the steel-framed reinforced concrete structural material, so that the construction cost can be significantly reduced.

  Further, since the reinforcing reinforcing bar 29 is included in the concrete 22 so as to surround the through hole 14, the concrete 22 around the through hole 14 can be reinforced even if the through hole 14 is formed in the concrete 22.

  Further, the thin-walled cylindrical member 33 of the steel beam member composed of the steel frame 24, the steel-frame reinforcing member 32, and the thin-walled cylindrical member 33 integrally assembled in the factory has a length shorter than the width of the flange 24c of the steel frame 24. Therefore, the thin cylindrical member 33 does not protrude beyond the width of the flange 24c of the steel frame 24 to be bulky. For this reason, since the steel beam member in such a bulky state is not transported from the factory to the site, the work of transporting the steel beam member can be performed efficiently.

  In addition, a paper tube may be used as a concrete mold for the through-hole 14, but since it is made of paper, it may burn, so it must be removed after the concrete has hardened. There is a problem of expansion and deformation. On the other hand, since the thin cylindrical member 33 and the spiral steel pipe 37 in the embodiment of the present invention are made of metal or at least a material having nonflammability and water resistance, there is no such problem.

  In the embodiment, the thin cylindrical member 33 and the spiral steel pipe 37 are cylindrical members having a circular cross section. However, a cylindrical member having an elliptical shape or a rectangular shape other than a circular cross section may be used. .

  Moreover, in the said embodiment, since the 2nd cylinder member 37 is slidably fitted and attached to the 1st cylinder member 33 attached in the axial hole 32b of the steel frame reinforcement member 32, the steel reinforced concrete structure material is attached. In the construction, prior to the construction of the reinforcing bar and the concrete formwork, the steel frame in a state in which the opening reinforcing reinforcement 29 formed integrally in advance on the second cylindrical member 37 is slid and pushed into the steel frame 24 side. Since the opening reinforcing member 29 does not interfere with the construction of the reinforcing bars 25 and the concrete formwork, the work on the construction site can be performed efficiently.

  In the embodiment, the circular steel reinforcing member 32 is used on the surface orthogonal to the axis, but the shape is almost circular, elliptical or similar, or 3 to 8 octagonal. It is also possible to use a steel reinforcing member having another shape such as a square shape.

  In the above embodiment, H-shaped steel is used for the steel frame 24. However, the steel frame 24 is not necessarily limited to the H-type, and any other cross-sectional shape steel frame may be used.

It is sectional drawing of the beam 30 which shows the reinforcement structure of the steel frame reinforced concrete structure material which concerns on one embodiment of this invention. 2 is a partial enlarged cross-sectional view showing a welded portion M of a gap having a groove angle θ between a web 24a of a steel frame 24 of a beam 30 and a steel reinforcing member 32 in FIG. FIG. 3 is an exploded side sectional view showing a steel frame reinforcing member 32, a thin cylindrical member 33, a spiral steel pipe 37, a lid member 39, and an opening reinforcing bar 29 of the beam 30 in FIG. It is the IV-IV arrow directional view of the steel frame reinforcement member 32 in FIG. It is a VV arrow directional view of the opening reinforcement bar 29 in FIG. It is a partially broken front view which shows the beam 20 provided between the pillars 10 and 10 as the conventional steel frame reinforced concrete structural material. It is the sectional view on the AA line of the beam 20 in FIG. It is the BB sectional view taken on the beam 20 in FIG. It is CC sectional view taken on the line of the beam 20 in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Column 14 Through-hole 20 Beam 22 Concrete 24 Steel 24a Web 24b Hole 25 Reinforcement 25a Beam main reinforcement 25b Reinforcement 26 Steel plate 27 Opening reinforcement reinforcing rod 28 Steel pipe 29, 29a, 29b Opening reinforcement reinforcing rod 30 Beam 32 Steel reinforcing member 32a Inclined part 32b Hole 33 Thin-walled cylindrical member 37 Spiral steel pipe 39 Cover member M Welded part θ Groove angle

Claims (4)

In a steel-framed reinforced concrete structure material in which a building structure material is constituted by a steel-framed reinforced concrete in which a steel frame having a flange portion and a reinforcing bar are encapsulated in the concrete, and through holes are formed in the width direction of the structural material,
A fitting part fitted into a hole provided in the steel frame is welded to the steel frame, and a steel frame reinforcing member having a shaft hole having a diameter substantially equal to or smaller than the diameter of the through hole,
A first thin-walled cylindrical member that is integrally provided only by fitting into the shaft hole of the steel frame reinforcing member, and whose axial length is shorter than the width of the flange portion of the steel frame; It is composed of a second thin-walled cylinder member that is slidably fitted and connected to the first thin-walled cylinder member along its axis , and functions as a concrete formwork of a through-hole formed in the structural material. Or a thin-walled cylinder member formed of a material having nonflammability and water resistance,
A reinforcing structure for a steel reinforced concrete structure material comprising: an opening reinforcing steel bar embedded in concrete so as to surround the thin cylindrical member of the through hole.   The steel frame reinforcing member has a ring shape, and is formed in a circular shape, an elliptical shape, a polygonal shape, or a shape close to these in a plane orthogonal to the axis of the through hole. Reinforced structure of the steel-framed reinforced concrete structure described.   The said steel frame reinforcing member has a thin flange part in the outer periphery, and the inclined part was formed in the fitting part in the cross section of the axial direction, The Claim 1 or Claim 2 characterized by the above-mentioned. Reinforced structure of steel reinforced concrete structure material. In a steel-framed reinforced concrete structure material in which a building structure material is constituted by a steel-framed reinforced concrete in which a steel frame having a flange portion and a reinforcing bar are encapsulated in the concrete, and through holes are formed in the width direction of the structural material,
A fitting part fitted into a hole provided in the steel frame is welded to the steel frame, and a steel frame reinforcing member having a shaft hole having a diameter substantially equal to or smaller than the diameter of the through hole,
A first thin-walled cylindrical member that is integrally provided only by fitting into the shaft hole of the steel frame reinforcing member, and whose axial length is shorter than the width of the flange portion of the steel frame; It is composed of a second thin-walled cylinder member that is slidably fitted and connected to the first thin-walled cylinder member along its axis , and functions as a concrete formwork of a through-hole formed in the structural material. Or a thin-walled cylinder member formed of a material having nonflammability and water resistance,
A method of constructing a reinforcing structure of a steel-framed reinforced concrete structure material comprising an opening reinforcing steel bar enclosed in concrete so as to surround the thin-walled cylindrical member of the through hole,
The thin-walled cylinder member functioning as a concrete mold for the through hole is attached to the steel reinforcing member in advance before placing the concrete, and does not need to be removed after the concrete is hardened. Construction method.

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