JP2008223350A - Method for forming insertion hole in steel member, construction method for wall body, wall body, construction method for column beam frame, column beam frame, and supporting member for form - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for forming an insertion hole in a steel member at an accurate position on an upper face of a beam member in the jointing work for installing an earthquake resisting wall protruding the steel member from its lower face to enable the steel member to be inserted into the insertion hole in the beam member formed by concrete without requiring much labor and time for construction work. <P>SOLUTION: In this method, a supporting member 100 is provided above the beam member, a sheath pipe 110 is removably attached to the supporting member 100 at a position where there is the insertion hole in the supporting member 100, and concrete constituting at least an upper part of the beam member is placed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  In the present invention, the seismic wall in which the steel material protrudes from the lower surface is installed so that the steel material is inserted into the steel material insertion hole provided on the upper surface of the beam member or floor member made of a concrete member. The present invention relates to a technique for joining a seismic wall to a beam member or a floor member by filling grout between steel members.

Conventionally, a seismic wall is installed in a column beam frame such as a reinforced concrete structure, a steel concrete structure, and a reinforced steel concrete structure. However, although these shear walls have high rigidity, their toughness is low, so when shear-type fracture occurs, a sudden decrease in the proof stress occurs. For this reason, for example, Patent Document 1 includes a low-strength portion having a thin wall thickness so that relative displacement in the horizontal direction is likely to occur, and a dowel line penetrating over the low-strength portion. A seismic wall is disclosed in which a gap is provided between the wall and the column.
JP-A-2005-120815

  As a method for joining such a seismic wall and a beam member, dowel bars are embedded in the seismic wall so that it protrudes at an appropriate interval from below, and an insertion hole is provided in the upper part of the beam member. A method is used in which a seismic wall is installed so that dowels are inserted into the holes, and grout is filled between the insertion holes and the dowels.

  Conventionally, such an insertion hole is placed in a position corresponding to the insertion hole with the formwork material formed in a cylindrical shape before placing the concrete constituting the beam member, and after the placed concrete is cured, It was formed by removing the formwork material.

  However, in the above method, the position of the formwork material may be displaced due to the concrete placing pressure during concrete placing, and the position of the insertion hole may be displaced. In addition, the formwork must be removed after the concrete is cured, resulting in poor workability.

  The present invention has been made in view of the above problems, and an object of the present invention is to form an insertion hole for a steel material at an accurate position on the upper surface of the beam member, and further improve workability.

  According to the method for forming a steel material insertion hole of the present invention, a wall body made of a PC member from which a steel material protrudes from the lower surface with an appropriate interval in the width direction, at least the concrete constituting the upper portion is made of on-site concrete, The wall member and the beam member or floor are constructed above the beam member or floor member provided with the steel material insertion hole at a position corresponding to the steel material so that the steel material is inserted into the insertion hole. A method of forming the insertion hole in a joining structure for joining a member, wherein a support member is detachably provided above the beam member or floor member, and a cylindrical member at least one of which is closed is attached to the support member. A member mounting step for removably mounting the support member so that the closed side faces downward at a position corresponding to the insertion hole; and at least an upper portion of the beam member or floor member. Characterized in that it comprises a concreting step of pouring the concrete, the.

  In the method for forming the insertion hole for the steel material, the bottom surface of the cylindrical member is formed with a screw hole having a screw thread on an inner peripheral surface, and is located at a position corresponding to the insertion hole of the support member. The through-hole is formed, and the cylindrical member is formed by inserting a screw member strip provided with a thread on the outer periphery into the through-hole and screwing into the screw hole of the cylindrical member. The member may be removably attached to the support member.

In addition, the cylindrical member may have irregularities on the outer peripheral surface, and the cylindrical member may be a sheath tube. The cylindrical member may be buried in the beam member or floor member.
The beam member or floor member may be formed by placing concrete on the upper portion of the half PC member.

Further, the method of building a wall body of the present invention is a method of building a wall body made of a PC beam member above a beam member or a floor member, and a support member is provided above the beam member or floor member, A member attaching step for removably attaching the cylindrical member closed at least one side to the support member so that the closed side faces downward, and placing concrete constituting at least the upper part of the beam member or floor member A concrete body placing step, a support member removing step for removing the support member from the beam member or floor member and the tubular member, and a wall body comprising a PC member from which a steel material protrudes from the lower surface at an appropriate interval in the width direction. And a wall erection process for erected so that the steel material is inserted into the insertion hole formed by the cylindrical member.
Moreover, the wall body of this invention was constructed | assembled by said method.

  The column beam frame construction method of the present invention is a method of building a column beam frame having a wall made of a PC member in the frame, and is a column member for building a column member constituting the column beam frame. A supporting member is provided above the lower beam member that constitutes the column beam frame, and the cylindrical member that is blocked at least one can be detached from the supporting member so that the closed side faces downward. A member attaching step for attaching to the concrete, a concrete placing step for placing concrete constituting at least the upper part of the lower beam member, a support member removing step for removing the support member from the lower beam member and the tubular member, A wall-building process in which a wall made of a PC member from which the steel material protrudes from the lower surface with an appropriate interval in the width direction is built so that the steel material is inserted into the insertion hole formed by the tubular member; Above Characterized in that it comprises a and an upper beam member constructing step of constructing the upper beam member such that said connected the wall above the body.

  Moreover, the column beam frame of the present invention is constructed by the column beam frame building method described above.

  Further, the support member of the formwork of the present invention comprises a wall body made of a PC member from which the steel material protrudes from the lower surface with an appropriate interval in the width direction, and at least the concrete constituting the upper portion is made of on-site concrete, Above the beam member or floor member in which the insertion hole for the steel material is provided at a position corresponding to the steel material, the steel material is installed so as to be inserted into the insertion hole, and between the insertion hole and the steel material. A support member used for forming the insertion hole when constructing the beam member or floor member in a joint structure for joining the wall body and the beam member or floor member by filling a grout, When placing concrete that constitutes at least the upper part of the beam member or the floor member, the concrete is disposed so as to be removable above the beam member or the floor member, and at least one of the positions corresponding to the insertion hole. There wherein the can be attached removably is closed tubular member.

  According to the present invention, by fixing the tubular member with the support member, the tubular member does not move even when placing concrete, so the steel material insertion hole can be formed at an accurate position. . Moreover, since it is not necessary to remove a cylindrical member after hardening of concrete, workability | operativity can be improved.

Hereinafter, an embodiment of a method for forming a steel material insertion hole of the present invention will be described in detail with reference to the drawings.
FIG. 1 shows a column beam frame 10 to which a seismic wall 1 is attached, (A) is a front view, (B) is an enlarged view of a part I in (A), and (C) is a II-II ′ sectional view. It is. As shown in the figure, the seismic wall 1 is connected so as to be connected to the upper beam member 4 and the lower beam member 2 constituting the column beam frame 10 and to be provided with a gap with the column member 3. Has been. The lower beam member 2 is constructed by placing concrete on the upper portion of the half PC beam member, and a dowel reinforcement insertion hole 21 is provided on the upper surface of the member at an appropriate interval.

The seismic wall 1 is made of a PC member, and a slit 11 extending horizontally in the lower part of the member is provided over the entire length of the wall, and the upper dowel bars 13 and the lower part so as to protrude vertically from the upper and lower surfaces, respectively. The dowels 12 are embedded. A partial slit 14 is provided in an adjacent portion of the lower dowel bar 12.
The lower dowel bar 12 penetrates the slit 11 up and down, and the lower end reaches the insertion hole 21 provided on the upper surface of the lower beam member 2. Grout is filled between the insertion hole 21 and the lower dowel bar 12 so that the lower dowel bar 12 is integrated with the lower beam member 2, and the lower part of the seismic wall 1 and the lower beam member 2 Are joined. Further, the upper dowel bar 13 is jointed to a reinforcing bar 42 in the upper beam member 4 by a mechanical joint 41 embedded in the upper beam member 4, whereby the upper part of the earthquake-resistant wall 1 is connected to the upper beam member 4. It is joined to.

  When shear deformation occurs between the upper beam member 4 and the lower beam member 2 due to earthquake motion or the like, a shear load acts on the earthquake resistant wall 1. In the portion corresponding to the slit 11 of the earthquake resistant wall 1 against this shear load, only the lower dowel bar 12 resists. When the shear load exceeds a predetermined magnitude, the lower dowels 12 cause shear deformation. However, since the partial slits 14 are provided adjacent to the lower dowels 12 as described above, Concrete will not be destroyed. Therefore, the seismic wall 1 can be deformed while maintaining the horizontal strength without destroying the seismic wall 1. The seismic wall 1 also functions as a seismic control wall because the lower dowels 12 deform while absorbing energy.

Hereinafter, a method of constructing the column beam frame 10 in which the earthquake-resistant wall 1 is attached in such a frame will be described.
FIG. 2 is a diagram for explaining a method of constructing a column beam frame with a seismic wall attached in the frame.
First, the earthquake-resistant wall 1 is manufactured in advance at a prefab factory or the like.
Next, as shown in FIG. 2A, the half PC member 22 is installed, and concrete is placed on the upper portion and the joint portion of the half PC member 22 to construct the lower beam member 2. At this time, an insertion hole 21 is provided in accordance with the position of the lower dowel muscle 12. A method for forming the insertion hole 21 in the lower beam member 2 will be described later.

Next, as shown in FIG. 2 (B), PC column members are built on both sides of the earthquake-resistant wall 1 to construct the column members 3. In addition, the column member 3 may be constructed by placing reinforcements and concrete on site, and this step may be performed after a step of installing the earthquake-resistant wall 1 described later.
Next, as shown in FIG. 2C, the insertion hole 21 of the lower beam member 2 is filled with the grout 15, and the lower dowel bar 12 protruding from the lower surface of the earthquake-resistant wall 1 is inserted into the insertion hole 21. As shown, the earthquake-resistant wall 1 is built above the lower beam member 2.

Next, as shown in FIG. 2 (D), the upper beam member 4 in which the mechanical joint 41 is embedded so that the reinforcing bar insertion opening is exposed on the lower surface is connected to the upper dowel bar protruding above the earthquake-resistant wall 1. 13 is inserted so as to be inserted into the mechanical joint 41. And the earthquake-resistant wall 1 and the upper beam member 4 are connected by filling the mechanical joint 41 with grout.
The gap between the earthquake-resistant wall 1 and the lower beam member 2 and the upper beam member 4 may be filled with grout.
Through the above steps, the column beam frame 10 in which the earthquake-resistant wall 1 is provided in the frame can be constructed.
When the seismic wall 1 is also provided at the same position on the upper floor, if the upper beam member 4 is used as the lower beam member, it is constructed in the same process as in FIGS. 2 (A) to (D) above. Good.

  As described in the section of the prior art, the insertion hole 21 of the dowel bar provided on the upper surface of the lower beam member 2 is conventionally inserted into the insertion hole 21 before placing the concrete constituting the lower beam member 2. A cylindrical formwork was installed at a position corresponding to this, and after the cast concrete was hardened, it was formed by removing the formwork.

  However, when placing concrete, this formwork moves, and the position of the insertion hole 21 is displaced, so that the earthquake resistant wall 1 may not be installed. In addition, each form has to be removed one by one, and there is a problem that construction takes time.

  Therefore, in this embodiment, as shown in FIG. 3 and FIG. 4, when the lower beam member 2 is constructed by placing concrete on the upper portion and the joint portion of the half PC member 22, the insertion hole of the dowel bar 21. Concrete is cast in a position corresponding to 21 while the sheath tube 110 is supported by the support member 100, and the sheath tube 110 is buried so as to be exposed on the concrete surface, thereby forming a dowel reinforcement insertion hole 21. did.

Hereinafter, a method for forming the dowel reinforcement insertion hole 21 will be described in detail with reference to FIGS. 3 and 4.
3 and 4 are views showing a state in which the support member 100 that supports the sheath tube 110 is installed, FIG. 3 is a perspective view, and FIG. 4A is a cross-sectional view in the width direction of the lower beam member 2. (B) is a sectional view in the length direction of the lower beam member 2. As shown in the figure, the support member 100 has a long bolt 103 and a through-hole through which the long bolt 103 passes, and a first angle fixed to the long bolt 103 by a nut 104 attached to the long bolt 103. Material 105, second angle member 106 that is in contact with the lower side of first angle member 105 and extends in the length direction of beam member 2, and welded or bolted to second angle member 106 And the third angle member 107 formed. A slab bolt 101 having a long nut 102 attached to the upper end is welded to the slab bars 51 of the slab 5 on both sides of the lower beam member 2, and the long bolt 103 is screwed to the long nut 102. It is supported by combining. In addition, what is necessary is just to connect the dimension cutting bolt 101 not only to the slab reinforcement 51 but to an appropriate member.

  The third angle member 107 is provided with a bolt insertion hole 107 </ b> A through which a bolt can be inserted in accordance with the position of the insertion hole 21. The height of the third angle member 107 can be adjusted as appropriate by adjusting the mounting position of the nut 104 that fixes the first angle member 105.

  The sheath tube 110 is a cylindrical member having an uneven surface and a closed bottom surface. At the center of the bottom surface of the sheath tube 110, a hole 110A having a thread on the inner peripheral surface is provided. The sheath tube 110 penetrates the long bolt 108 through the bolt insertion hole 107A of the third angle member 107. And fixed to the third angle member 107 by being screwed into the hole 110A on the bottom surface. With this configuration, the sheath tube 110 can be fixed in accordance with the position of the insertion hole 21.

  After fixing the sheath tube 110 with the support member 100, the concrete which comprises the upper part of the beam member 2 and the slab 5 is poured to the height shown with the broken line in the figure. At this time, since the sheath tube 110 is fixed by the support member 100, the position of the sheath tube 110 can be prevented from being displaced due to the concrete placing pressure.

  After the cast concrete is hardened, the long bolt 108 for fixing the sheath tube 110 is removed, the long bolt 103 screwed with the long nut 102 is removed, and the support member 100 is removed. The sheath tube 110 is left as it is embedded in the concrete.

  Through the above steps, the sheath tube 110 is buried so as to open on the upper surface at a position corresponding to the insertion hole 21 of the lower beam member, and the hole formed by the sheath tube 110 is used as the insertion hole 21. Can do. The support member 100 can be used when an insertion hole for another beam member is formed after the sheath tube 110 is removed.

  Here, even if the lower dowel muscle 12 is inserted into the sheath tube 110 and the grout 15 is filled between the sheath tube 110 and the lower dowel muscle 12 as described above, the shear force is applied to the earthquake resistant wall 1 due to seismic motion or the like. Acts, the force moves in the direction of pulling out the lower dowel 12 from the grout 15 by horizontally moving above the slit 11 of the earthquake resistant wall 1. On the other hand, since the sheath tube 110 has irregularities on the surface, the load can be transmitted between the concrete constituting the lower beam member 2 and the grout 15 filled in the sheath tube 110, so The pulling force acting on the dowel muscle 12 can be resisted. For this reason, the grout 15 is not separated from the concrete constituting the lower beam member 2, and the deterioration of the structural performance due to the cross-sectional defect of the beam member accompanying the separation of the grout 15 can be prevented.

  As described above, according to the method for forming the insertion hole of the present embodiment, the concrete is placed in a state in which the sheath tube 110 is fixed to the position corresponding to the insertion hole 21 by the support member 100. Holes 21 can be formed. In addition, since it is not necessary to remove the sheath tube 110 from the concrete constituting the lower beam member 2, labor can be reduced.

In this embodiment, the sheath tube 110 is left on the concrete constituting the lower beam member. However, the present invention is not limited to this and may be removed after the concrete is hardened.
In the present embodiment, the sheath tube 110 is embedded. However, the present invention is not limited to this, and a configuration in which a member having irregularities around the periphery is also embedded. Further, in the case where a sufficient adhesion force can be ensured between the concrete constituting the lower beam member 2 and the grout filled in the insertion hole 21, the surrounding unevenness may not be provided.

  Further, in the present embodiment, the case where the beam member is constructed by placing concrete above the half PC member 22 has been described as an example. However, the present invention is not limited to this. As shown in FIG. 5, as shown in FIG. 5, the support member 100 is installed on the formwork 120 used when placing the concrete constituting the slab. The sheath tube 110 can be fixed.

  Moreover, although this embodiment demonstrated as an example the case where the earthquake-resistant wall 1 was provided with the slit 11 extended in the horizontal direction in the lower part of a member, not only this but the appropriate height slit 11 of a member shall be provided. Moreover, it is good also as a structure which provides the slit 11 in different height. Moreover, it is good also as a structure which replaces with the slit 11 and provides the low intensity | strength site | part with thin wall thickness so that it may extend in a horizontal direction.

  Furthermore, in this embodiment, although the case where the earthquake-resistant wall 1 provided with the slit 11 extended in a horizontal direction was installed in the column beam frame 10, it is not limited to this, and includes a PC member in which a steel material protrudes from the lower surface, It can be applied to any wall body joined to the lower beam member by inserting a steel material into the insertion hole opened on the upper surface of the lower beam member and filling the grout between the insertion hole and the steel material. .

  Moreover, although this embodiment demonstrated the case where the earthquake-resistant wall 1 was constructed | assembled on the beam member 2 below the column beam frame 10, it uses not only this but also when constructing the earthquake-resistant wall 1 on a flat slab. be able to.

The column beam frame to which the earthquake-resistant wall was attached is shown, (A) is a front view, (B) is an enlarged view of the part I in (A), (C) is II-II 'sectional drawing. It is a figure for demonstrating the method to construct | assemble the column beam frame with which the earthquake-resistant wall was attached in the frame. It is a perspective view which shows a mode that the supporting member which supports a sheath pipe | tube was installed. It is a figure which shows a mode that the support member which supports a sheath pipe | tube was installed, (A) is sectional drawing of the width direction of a lower beam member, (B) is sectional drawing of the length direction of a lower beam member. . It is a figure which shows the structure of the supporting member in the case of constructing | assembling a beam member by placing concrete on the spot.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Earthquake-resistant wall 2 Lower beam member 3 Column member 4 Upper beam member 5 Slab 10 Column beam frame 11 Slit 12 Lower dowel reinforcement 13 Upper dowel reinforcement 14 Partial slit 15 Grout 21 (Dowel reinforcement) insertion hole 22 Half PC Member 41 Mechanical joint 42 Reinforcing bar 51 Slab bar 100 Support member 101 Cutting bolt 102 Long nut 103 Long bolt 104 Nut 105 First angle member 106 Second angle member 107 Third angle member 107A Bolt insertion hole 108 Long Bolt 110 sheath tube 110A hole 120 formwork

Claims (11)

A wall made of a PC member from which the steel material protrudes from the lower surface with an appropriate interval in the width direction, at least the concrete constituting the upper portion is made of in-situ concrete, and the insertion hole for the steel material at a position corresponding to the steel material on the upper surface The insertion hole in the joint structure for joining the wall body and the beam member or floor member by building the steel material so that the steel material is inserted into the insertion hole above the beam member or floor member provided with A forming method comprising:
A support member is detachably provided above the beam member or floor member, and at least one of the cylindrical members is closed at a position corresponding to the insertion hole of the support member so that the closed side faces downward. A member attaching step for detachably attaching to the support member;
A concrete placing step for placing concrete constituting at least the upper part of the beam member or floor member, and a method for forming a steel material insertion hole. A screw hole having a screw thread on the inner peripheral surface is formed on the bottom surface of the cylindrical member,
A through hole is formed at a position corresponding to the insertion hole of the support member,
The cylindrical member is removably attached to the support member by inserting a screw member strip provided with a thread on the outer periphery into the through-hole and screwing it into the threaded hole of the cylindrical member. The method for forming a steel material insertion hole according to claim 1.   The method for forming a steel material insertion hole according to claim 1 or 2, wherein the cylindrical member has irregularities on an outer peripheral surface.   4. The method for forming a steel material insertion hole according to claim 3, wherein the cylindrical member is a sheath tube.   The method for forming a steel material insertion hole according to any one of claims 1 to 4, wherein the cylindrical member is buried in the beam member or floor member.   6. The method for forming a steel material insertion hole according to claim 1, wherein the beam member or the floor member is formed by placing concrete on an upper portion of the half PC member. A method for constructing a wall made of a PC beam member above a beam member or a floor member,
A member attachment step of providing a support member above the beam member or floor member, and removably attaching the cylindrical member, at least one of which is closed, to the support member so that the closed side faces downward;
A concrete placing step for placing concrete constituting at least the upper part of the beam member or floor member;
A support member removing step of removing the support member from the beam member or floor member and the tubular member;
A wall-building process in which a wall made of a PC member from which the steel material protrudes from the lower surface with an appropriate interval in the width direction is built so that the steel material is inserted into the insertion hole formed by the tubular member;
A method for constructing a wall, comprising:   A wall body constructed by the wall body construction method according to claim 7. A method of constructing a column beam frame with a wall made of PC members in the frame,
A column member construction step of constructing a column member constituting the column beam frame;
A member attachment for providing a support member above a lower beam member constituting the column beam frame and detachably attaching a cylindrical member closed at least one to the support member so that the closed side faces downward. Process,
A concrete placing step for placing concrete constituting at least the upper part of the lower beam member;
A support member removing step of removing the support member from the lower beam member and the cylindrical member;
A wall-building process in which a wall made of a PC member from which the steel material protrudes from the lower surface with an appropriate interval in the width direction is built so that the steel material is inserted into the insertion hole formed by the tubular member;
An upper beam member construction step of constructing an upper beam member so as to be connected to the wall body above the wall body, and a method for constructing a column beam frame.   A column beam frame comprising a wall in the frame, wherein the column beam frame is built by the column beam frame building method according to claim 9. A wall made of a PC member from which the steel material protrudes from the lower surface with an appropriate interval in the width direction, at least the concrete constituting the upper portion is made of in-situ concrete, and the insertion hole for the steel material at a position corresponding to the steel material on the upper surface The wall member and the beam are formed by placing the steel material so as to be inserted into the insertion hole above the beam member or floor member provided with a grouting, and filling a grout between the insertion hole and the steel material. A support member used for forming the insertion hole when constructing the beam member or floor member in a joining structure for joining a member or a floor member,
A cylindrical member that is detachably installed above the beam member or floor member and at least one of which is closed at a position corresponding to the insertion hole when placing concrete constituting at least the beam member or floor member. A support member for a formwork, which can be removably attached.