JP4982352B2 - Reinforcement structure for joint between wall and floor or beam, construction method for joint between wall and floor or beam, reinforcement method for joint between wall and floor or beam - Google Patents

Description

  The present invention relates to a structure and method for reinforcing a joint between a slab or beam in which a reinforcing bar or steel material is embedded so as to extend in a horizontal direction and a concrete wall in which an H-shaped steel is embedded so as to extend in a vertical direction, and the joining thereof. It is related with the construction method of a department.

  Conventionally, underground walls such as SC continuous walls and steel continuous walls are joined to slabs and beams of buildings and the underground walls are used as a part of the building. In such a case, the underground wall and the slab or beam are integrated by fixing the end of the reinforcing bar embedded in the slab or beam of the building to the H-shaped steel flange embedded in the underground wall. I was letting.

  As described above, when reinforcing bars or steel frames are fixed to the H-shaped steel slab or the beam-side flange, the tensile force acts on the flange toward the slab or the beam, but the H-shaped steel flange has a slab or beam-side surface. Only cover concrete exists. For this reason, the tensile force is resisted only by the deformation resistance of the flange, and the flange may be deformed.

  Thus, for example, Patent Document 1 describes a configuration in which a plurality of rod-shaped reinforcing members are attached so as to connect both flanges of H-shaped steel (steel sheet pile having an H-shaped cross section). According to such a configuration, a part of the load acting on the flange on the slab or the beam side is transmitted to the other flange, and the tensile force can be resisted by both flanges and the concrete between these flanges. Can be suppressed.

Japanese Patent No. 2673634

  However, in the configuration described in Patent Document 1, when the underground wall having a narrow interval between the embedded H-shaped steels is constructed, if the reinforcing member is attached so as to connect the two flanges of the H-shaped steel as described above, It becomes difficult to insert a tremely pipe between reinforcing members attached to adjacent H-shaped steels, and the workability of placing concrete is impaired.

  The present invention has been made in view of the above-described problems, and the deformation generated in the H-shaped steel at the joint portion between the concrete wall embedded with the H-shaped steel and the slab or the beam without impairing the workability of placing concrete. It aims at enabling it to control.

  In the reinforcing structure of the joint between the wall and the floor or the beam according to the present invention, the reinforcing bar or the steel frame of the floor or the beam is connected to one flange of the H-shaped steel embedded in the concrete wall so as to extend in the vertical direction. A reinforcing structure for reinforcing a joint portion between a concrete wall and a floor or a beam, wherein a reinforcing member is connected between both flanges of the H-shaped steel, and the reinforcing member has at least an intermediate portion thereof It is characterized by being curved so as to be closer to the web of the H-shaped steel than the connecting portion with one flange.

In the reinforcing structure of the joint portion between the wall and the floor or the beam, the reinforcing member may be formed by bending a rod-shaped member.
Moreover, in the reinforcement structure of the junction part of said wall and a floor or a beam, the one or several said reinforcement member may be provided in the position corresponding to the said one or several said reinforcement or steel frame. Further, one reinforcing member is provided corresponding to one reinforcing bar or steel frame, and the connection position of the reinforcing member to the flange to which the reinforcing bar or steel frame is connected is the connection position of the reinforcing bar or steel frame. It may be the same position on both sides.
The wall may be an underground wall.

  A method for constructing a joint between a wall and a floor or a beam according to the present invention is a method for constructing a joint between a wall and a floor or a beam having the above-described reinforcing structure, and the reinforcing member is attached to both the H-shaped steels. The underground wall is constructed so that the H-shaped steel with the reinforcing member attached is embedded so as to extend between the flanges, and the concrete on the surface of the underground wall on the slab or beam side is suspended. , Exposing at least part of the outer surface of the slab or beam-side flange of the H-shaped steel, connecting the end of the reinforcing bar or steel frame to the exposed outer surface of the flange, and burying the reinforcing bar or steel frame The slab or beam is constructed as described above.

  Further, according to the method of reinforcing a joint portion between a wall and a floor or a beam according to the present invention, a reinforcing bar or a steel frame of a floor or a beam is connected to one flange of an H-shaped steel embedded in a concrete wall so as to extend vertically. A method of reinforcing a joint portion between a concrete wall and a floor or a beam, the intermediate portion of which is between the flanges of the H-shaped steel than the connection portion with at least one flange. A reinforcing member that is curved so as to approach the H-shaped steel web is connected.

  According to the present invention, the tensile force acting on the flange of the H-shaped steel from the rebar or steel frame of the beam or slab is transmitted to the reinforcing member. When the tensile force acts on the reinforcing member, the reinforcing member tends to be deformed. However, since the deformation is restricted by the supporting pressure of the surrounding concrete, the tensile force is transmitted as an axial force and transmitted to the other flange. Thereby, it can resist with respect to the tensile force which acts from the reinforcement or steel frame of a beam or a slab with both flanges and the concrete between these flanges, and can suppress the deformation which arises in H-shaped steel. Furthermore, since the middle of the reinforcing member is curved so as to approach the web, it does not become an obstacle when inserting the tremy pipe when placing concrete, and workability is not impaired.

Hereinafter, an embodiment of a reinforcing structure for a joint portion between a wall and a beam or a slab according to the present invention will be described in detail with reference to the drawings, taking as an example a case where the structure is applied to a joint portion between a slab and an underground wall.
FIG. 1 is a view showing a joint structure 10 between an underground wall 20 and a slab 30 to which a reinforcing method of the present embodiment is applied, in which (A) is a horizontal sectional view and (B) is a vertical direction. It is sectional drawing. As shown in the figure, the underground wall 20 is a steel-concrete underground wall in which an H-shaped steel 21 is embedded in a concrete 25 so as to extend in the vertical direction. In addition to being used as a retaining wall, after the building is completed, it will be used as the main wall of the building. The slab 30 is a reinforced concrete slab in which a plurality of slab bars 32 are embedded in the concrete 31.

  As shown in FIG. 1, the joining structure 10 between the underground wall 20 and the slab 30 is such that the slab bar 32 constituting the slab 30 has an outer surface of the flange 23 on the slab 30 side of the H-shaped steel 21 constituting the underground wall 20. And a reinforcing member 40 is attached between the flanges 22 and 23 of the H-shaped steel 21 embedded in the underground wall 20.

  As the reinforcing member 40, a reinforcing bar having the same diameter as the slab bar 32 constituting the slab 30 is used. One end of the reinforcing member 40 is welded and connected to the position on the inner surface of the flange 23 where the outer surface slab bar 32 is connected to the front and back, and the other end is the ground side of the H-shaped steel 21 ( That is, it is welded to the inner surface of the flange 22 on the side opposite to the side to which the slab 30 is connected. Further, the intermediate portion of the reinforcing member 40 is curved toward the web 24 side of the H-shaped steel 21. As will be described later, when a tensile force is transmitted from the slab bar 32 and the reinforcing member 40 is deformed so as to extend linearly by the tensile force, the concrete 25 constituting the underground wall 20 deforms this deformation. to bound. In this case, the curvature of the reinforcing member 40 is such that the tensile force acting on the reinforcing member 40 and the bearing strength of the concrete 25 constituting the underground wall 20 are such that the concrete 25 is not destroyed by the supporting pressure acting from the reinforcing member 40. It is determined based on the relationship.

  When a load is applied to the slab 30, a tensile force is applied to the slab bar 32, and this tensile force is transmitted to the flange 23 of the H-shaped steel 21. The tensile force transmitted to the flange 23 acts on the reinforcing member 40. At that time, the reinforcing member 40 tries to be deformed so as to extend linearly (that is, the intermediate portion is separated from the web 24), but a supporting pressure acts from the surrounding concrete 25 so as to resist the deformation, Since the deformation of the reinforcing member 40 is restrained, the reinforcing member 40 is kept in a curved shape. For this reason, the tensile force which acted on the reinforcement member 40 is transmitted to the reinforcement member 40 as an axial force, and is transmitted to the flange 22 on the natural ground side. Thereby, both flanges 22 and 23 and the concrete 25 between these flanges 22 and 23 can be integrally resisted against the tensile force transmitted from the slab reinforcement 32, and the deformation | transformation which arises in the flange 23 is suppressed. Can do.

The joint structure 10 between the underground wall 20 and the slab 30 can be constructed as follows.
First, the ground is excavated along the outer periphery of the building to form an excavation hole, and the H-shaped steel 21 to which the reinforcing member 40 is attached is built in the excavation hole. Then, as shown in FIG. 2, the tremy pipe 50 is inserted between the adjacent H-shaped steels 21 in the excavation hole, and the concrete 25 is placed through the tremy pipe 50. As described above, since the reinforcing member 40 has a shape in which the intermediate portion is curved toward the web 24, the reinforcing member 40 does not interfere when the tremy tube 50 is inserted between the adjacent H-shaped steels 21, and is smooth. It is possible to perform concrete placement work. And the underground wall 20 is constructed | assembled because the cast concrete 25 hardens | cures.

Next, the underground wall 20 is used as a retaining wall, and a portion corresponding to the underground part of the ground building is excavated.
Next, the underground part of the building is constructed using the underground wall 20 as a part of the building. When constructing the slab 30 to be joined to the underground wall 20, the concrete 25 of the portion to which the slab reinforcement 32 of the underground wall 20 is connected is hung and the outer surface of the flange 23 of the H-shaped steel 21 is exposed. Let The slab bar 32 is welded to the outer surface of the flange 23 so as to coincide with the position where the reinforcing member 40 on the inner surface of the flange 23 is connected, and the slab 30 is embedded so as to embed the slab bar 32. Build up.

The joint structure 10 of the underground wall 20 and the slab 30 is constructed by the above process.
According to the present embodiment, since the reinforcing member 40 having a shape curved toward the web 24 side in the middle is attached between both flanges 22 and 23 of the H-shaped steel 21 embedded in the underground wall 20, When placing the concrete 25 constituting the underground wall 20, it does not become an obstacle when inserting the tremy pipe 50 between the H-shaped steel 21, and the workability is not impaired.

  Moreover, since the reinforcement structure of this embodiment consists only of the reinforcement member 40 attached between the flanges 22 and 23, there are also few labor of welding and it can hold down the cost concerning material cost and welding.

  By the way, as a method of reinforcing the joint portion between the wall and the slab, as shown in FIG. 3, the reinforcing steel plate 140 is attached along the web 124 of the H-shaped steel 121 embedded in the underground wall 120, and this reinforcing It is also conceivable to attach plate-shaped diagonal members 141 and 142 so as to connect the steel plate 140 and both flanges 122 and 123. Even in such a configuration, the tensile force acting on the flange 123 is transmitted to the flange 122 via the diagonal members 141 and 142 and the reinforcing steel plate 140, so both flanges 122 and 123 and the concrete between them are applied to the tensile force. It can resist by 125 and can suppress the deformation | transformation which arises in the flange 123. FIG.

  However, in the reinforcing method shown in FIG. 3, the tensile force transmitted from the slab bar 132 is transmitted as a local load to the diagonal member 142 via the flange 123, and is transmitted to the diagonal member 142 and the steel plate 140 when transmitted through the diagonal member 142. It is gradually diffused toward the mountain side. For this reason, a large stress locally acts on a portion corresponding to the vicinity of the portion where the diagonal member 142 located on the slab 130 side or the slab bar 132 of the steel plate 140 is connected. For this reason, when designing the diagonal member 142 and the steel plate 140, it has to be designed so as not to yield at a portion where stress is concentrated in this way, which takes time and effort. In addition, as the diagonal member 142 and the steel plate 140, a steel material having a thickness that does not cause yield at a portion where the stress is maximum is used, and a portion having a low stress has a proof stress more than necessary. This was the cause of an increase in the amount of steel required for reinforcement. On the other hand, according to the present embodiment, since the tensile force is transmitted by the axial force of the reinforcing member 40 as described above, the stress is substantially constant in the cross section of the reinforcing member 40, the design is easy, and the reinforcement The amount of the steel material of the member 40 can be minimized, and the cost can be reduced.

  In the present embodiment, the reinforcing member 40 is welded and connected so that the portion where the end portion of the reinforcing member 40 is connected to the flange 23 and the portion where the slab bar 32 is connected coincide with each other. It is not always necessary to match the location where the end of the reinforcing member 40 is connected with the location where the slab bar 32 is connected. However, if the portion where the end of the reinforcing member 40 is connected and the portion where the slab bar 32 is connected are separated, stress acts between the portion of the flange 23 where the reinforcing member 40 and the slab bar 32 are connected. Therefore, it is preferable to match the location where the end of the reinforcing member 40 is connected to the location where the slab bar 32 is connected.

  In the present embodiment, as shown in FIG. 1, both joint positions of the reinforcing member 40 and the flanges 22 and 23 are substantially the same distance from the web 24. The distance from the position may be different. For example, the end of the reinforcing member 40 on the natural ground side may be welded to the vicinity of the web 24 of the flange 22. In such a case, as shown in FIG. However, the reinforcing member 60 formed linearly can be used.

  In the present embodiment, the reinforcing member 40 made of a reinforcing bar having the same diameter as that of the slab bar 32 is provided corresponding to each slab bar 32. However, the present invention is not limited to this. A reinforcing member having a diameter larger than that of the slab bar may be connected to a position corresponding to the vicinity of the center, and a plurality of reinforcing members having a diameter smaller than that of the slab bar may be provided at a corresponding position with respect to one slab bar. It is good also as a structure.

  Moreover, in this embodiment, although the case where the slab 30 by which the slab reinforcement 32 was embed | buried in the concrete 31 and the underground wall 20 was joined was demonstrated, not only this but an underground wall and the underground part of a building The present invention can also be applied when joining a beam. In this case, the beam bars may be welded to the H-shaped steel of the underground wall. Furthermore, the present invention can also be applied to the case where a slab or beam in which steel material is embedded and a ground wall are joined. In this case, the steel material may be welded to the H-shaped steel of the ground wall.

  In the present embodiment, the reinforcing bar is used as the reinforcing member. However, the present invention is not limited to this, and a steel plate that is curved toward the web side at the intermediate portion may be used.

  Furthermore, although this embodiment demonstrated the case where the underground wall 20 and the underground slab 30 of a building were joined, not only this but the wall by which H-shaped steel is embed | buried under the concrete in the ground floor of a building, The present invention can also be applied to a case where a building beam or slab is joined. Even in such a case, there is a possibility that the flange may be deformed when the beam or slab reinforcement is welded to the flange of the H-shaped steel beam or slab side embedded in the wall, and the flanges are connected. If a rod-shaped reinforcing member is attached to the hose, the hose of the pump car interferes with the reinforcing member when the concrete constituting the wall is placed, so that workability is impaired. On the other hand, by applying the present invention, the deformation of the flange can be prevented, and when placing concrete, the hose of the pump car can be smoothly inserted between the H-shaped steels. Will not be damaged.

It is a figure which shows the junction structure of the underground wall and slab of this embodiment, Comprising: (A) is a horizontal sectional view, (B) is a vertical sectional view. It is a vertical sectional view of an underground wall showing a state where a tremy pipe is inserted and concrete is placed. It is a figure which shows the joining structure of the conventional underground wall and slab. It is a figure which shows the reinforcement structure using the reinforcement member by which the natural ground side was formed in the linear form from the intermediate part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Junction part 20 Underground wall 21 H-shape steel 22 Flange 23 (Soil side) Flange 24 (Slab side) Flange 24 Web 25 Concrete 30 Slab 31 Concrete 32 Slab reinforcement 40 Reinforcement member 50 Toremy tube

Claims (7)

Reinforce the joint between the concrete wall and the floor or beam, in which the reinforcing bar or steel frame of the floor or beam is connected to one flange of the H-shaped steel embedded in the concrete wall so as to extend vertically. A reinforcing structure,
A reinforcing member is connected between both flanges of the H-shaped steel, and the reinforcing member is curved so that an intermediate portion thereof is closer to the web of the H-shaped steel than a connecting portion with at least one of the flanges. Reinforcement structure of the joint between the wall and the floor or beam characterized by   2. The reinforcing structure of a joint portion between a wall and a floor or a beam according to claim 1, wherein the reinforcing member is formed by bending a rod-shaped member. A reinforcement structure for a joint between a wall and a floor or a beam according to claim 2,
One or a plurality of the reinforcing members are provided at positions corresponding to the one or a plurality of the reinforcing bars or steel frames. A reinforcing structure of a joint portion between a wall and a floor or a beam according to claim 3,
One reinforcing member is provided corresponding to one reinforcing bar or steel frame, and the connection position of the reinforcing member to the flange on the side to which the reinforcing bar or steel frame is connected is the same as the connection position of the reinforcing bar or steel frame. A reinforcing structure for a joint between a wall and a floor or a beam, characterized by being in the same position.   The reinforcing structure for a joint portion between a wall and a floor or a beam according to any one of claims 1 to 4, wherein the wall is an underground wall. A method for constructing a joint portion between a wall having a reinforcing structure according to claim 5 and a floor or a beam,
The reinforcing member is attached so as to span between both flanges of the H-shaped steel,
The underground wall is constructed so that the H-shaped steel with the reinforcing member attached is embedded,
The concrete of the surface on the slab or beam side of the underground wall is suspended, and at least a part of the outer surface of the flange of the slab or beam side of the H-shaped steel is exposed,
Connecting the end of the rebar or steel frame to the outer surface of the exposed flange;
A method for constructing a joint between a wall and a floor or a beam, wherein the slab or the beam is constructed so that the reinforcing bar or the steel frame is embedded. Reinforce the joint between the concrete wall and the floor or beam, in which the reinforcing bar or steel frame of the floor or beam is connected to one flange of the H-shaped steel embedded in the concrete wall so as to extend vertically. A method,
A wall and a floor characterized by connecting a reinforcing member that is curved so that the intermediate portion thereof is closer to the H-shaped steel web than the connecting portion with at least one of the flanges across the flanges of the H-shaped steel. Or the reinforcement method of the junction part with a beam.

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