JP3851563B2 - Frame reinforcement structure and its construction method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a frame reinforcement structure that increases the rigidity and proof stress of a beam-column frame in an existing building, and a construction method thereof.
[0002]
[Prior art]
For existing buildings that have been judged to be insufficient in earthquake resistance, steel braces with frames and reinforcement walls, which are face materials, will be added to the inner surface of the beam column structure formed from beams and columns. There are generally frame reinforcement structures that increase stiffness and yield strength.
[0003]
For example, as shown in FIG. 4, in the conventional frame reinforcing structure 1 ″, the space between the beam column frame 10 ″ and the frame 21 ″ of the steel brace 20 ″ is filled with the filler 7 ″. In order to sufficiently transmit the shear stress generated in the event of an earthquake or the like between the beam column frame 10 ″ and the steel brace 20 ″, anchor reinforcing bars 8 ″ are driven into the existing frame at predetermined intervals, and the beam A structure is adopted in which the bondability between the column frame 10 ″ and the filler 7 ″ is enhanced. Reference numeral 31 ″ denotes a stud bolt for improving the joining property of the frame 21 ″ and the filler 7 ″, and reference numeral 32 ″ denotes the beam column frame 10 ″ and the steel brace 20 ″. The spiral muscle for preventing the splitting which generate | occur | produces in a junction part is shown.
[0004]
[Problems to be solved by the invention]
However, the conventional frame reinforcing structure 1 '' has the following problems because a large number of anchor reinforcing bars 8 '' are placed on the beam column frame 10 '' of the existing building.
(1) The construction work of the frame reinforcement structure 1 '' is performed while using the existing building, but noise, vibration, and dust are generated when the anchor rebar 8 '' is placed. The impact on the living environment of building users is very large.
Also, a finishing material such as mortar may be applied to the inner surface of the beam column frame 10 ″, but if the finishing material remains, the adhesion and frictional force of the filler 7 ″ will be reduced. Therefore, it is necessary to remove the finishing material, and in this case, noise, vibration, and dust are generated.
(2) When the concrete strength of the beam column frame 10 ″ is low, the anchor reinforcing bar 8 ″ that has been placed cannot exhibit the predetermined shear strength or pullout strength, so the beam column frame 10 ″ and the steel brace 20 ′ 'Stress transfer to and from may be insufficient.
(3) Placing a large number of anchor rebars 8 ″ on the beam column 10 ″ will damage the column or beam to some extent, especially when the cross section of the column or beam is small. Will have a significant impact.
(4) Breathing or bubbles are generated in the filler 7 '' filled in the gap between the beam column frame 10 '' and the steel brace 20 '', and the beam column frame 10 '' and the steel brace 20 'after construction are formed. By forming a gap at the joint of ', the integrity may be impaired, and the adhesion and frictional force may be reduced.
[0005]
The present invention has been made in order to solve the above-mentioned problem, and it is possible to increase the strength and rigidity of the joint portion between the beam column frame and the face material, and to perform the construction with ease. It is an object of the present invention to provide a frame reinforcing structure and a construction method thereof.
[0006]
[Means for Solving the Problems]
In order to solve the above problems, a frame reinforcing structure of the present invention is provided on a frame inner surface of a beam column frame including two columns to be erected and upper and lower beams horizontally disposed on the two columns. A frame reinforcing structure in which a face member is fixed, and a predetermined number of recesses are formed on the inner surface side of the upper and lower beams and at least a part of the two columns constituting the beam column frame, and A connecting member joined to the face material is inserted into the concave portion, and the joint portion between the face material and the beam pillar frame and the concave portion are filled with a solidifying material, whereby the beam The column frame and the face material are integrated.
[0007]
Here, the face material is a member such as a brace and a wall having high rigidity, and it is preferable to use a steel brace with a frame, a reinforced concrete wall, a precast concrete wall, or the like.
In addition, the shape, size, number, etc. of the recesses depend on the required performance at the joint between the face member and the beam column frame, and are determined for the bond force necessary for transmitting the shear force from the beam column frame to the frame member. It is what The concave portion may be provided in at least a part of the upper and lower beams and the two columns constituting the beam column frame, the side surfaces (frame inner surface) of the two columns, the upper surface of the lower beam, or the upper side. You may provide in the lower surface of a beam.
[0008]
In addition, the connecting member is provided to connect the beam column frame and the face material to exert the dowel effect, and it is possible to use a reinforcing bar with a threaded portion or a fully threaded steel bar. It is suitable for performing work.
Further, the solidifying material may be any material that can be cured after filling and can join the face material and the beam column structure, and is made of a resin such as mortar, concrete and premix type cement grout material, or epoxy resin. It is preferable to use an adhesive or the like.
[0009]
In the frame reinforcing structure of the present invention, the solidified material hardened around the connecting member inserted in the recess and the connecting member are integrated to transmit a shear force between the beam column frame and the face member. For this reason, a shear key is formed, and a connecting member around the solidified material functions as a dowel bar. The shear key enhances the friction effect and the adhesion effect at the joint between the beam column frame and the face material, and exhibits the dowel effect of the connecting member as the displacement at the joint increases. Therefore, according to the present invention, it is possible to ensure the integrity of the beam column frame and the face material by the combined effect of the shear key and the dowel reinforcement, and therefore it is possible to ensure a good shear transmission characteristic even at the final time. .
[0010]
Further, in the frame reinforcing structure, the face material includes a four-frame frame in which H-shaped steel is arranged so as to be in the strong axis direction in the frame surface of the beam column frame, and a diagonal member joined to the four-frame frame. The H-shaped steel in the four-frame frame is divided into a predetermined number and formed on a flange surface facing the frame inner surface of the beam column frame for joining the divided H-shaped steel. The accessory plate and the fixing tool for fixing the accessory plate to the H-shaped steel may also be used as a shear key.
Here, it is preferable to use a splice plate for the accessory plate and a bolt or a rivet for the fixing tool.
[0011]
According to the present invention, a joining plate provided on a flange surface facing a frame inner surface of a beam column frame for joining H-section steel, and a fixing tool for fixing the attachment plate to the H-section steel, Since it forms irregularities and acts as a shear key, the occurrence of displacement on the flange surface is prevented, and it is possible to ensure the integrity of the beam column frame and the face material.
[0012]
Further, in the frame reinforcing structure, the face material includes a four-frame frame and a diagonal member joined to the four-frame frame, and a predetermined surface is provided on a surface facing the frame inner surface of the beam column frame in the four-frame frame. A number of shear keys may be provided.
Here, the shear key can be provided by welding a reinforcing bar, an angle member, a flat bar, or the like to a surface of the quadruple frame frame facing the frame inner surface of the beam column frame at a predetermined interval.
Moreover, there is no restriction | limiting in particular in the shape of a quadrilateral frame frame, H-section steel, I-section steel, a channel-shaped steel, or steel materials with a box-shaped cross section shape etc. can be used.
[0013]
According to the present invention, since a predetermined number of shear keys are provided on the surface facing the frame inner surface of the beam column frame in the four-frame frame, the occurrence of displacement on the surface on which the shear key of the four-frame frame is provided. Thus, the integrity of the beam column frame and the face material can be ensured.
[0014]
Furthermore, the construction method of the frame reinforcing structure according to the present invention includes a surface material on a frame inner surface of a beam column frame including two columns to be erected and upper and lower beams horizontally disposed on the two columns. It is characterized by including the following steps to unite both by fixing, and by employing this construction method, the construction can be easily performed.
(1) A recess drilling step of drilling a predetermined number of recesses on the inner surface side of the frame in at least a part of the upper and lower beams and the two columns constituting the beam column frame.
(2) A face material arrangement step of arranging a face material along the frame inner surface of the beam column frame.
(3) A solidifying material filling step in which a connecting member is inserted into the recess and joined to the face material, and the joint material between the face material and the beam column frame and the recess are filled with a solidifying material.
[0015]
Further, according to the construction method of the frame reinforcing structure of the present invention, a surface material is provided on a frame inner surface of a beam column frame including two columns to be erected and upper and lower beams horizontally disposed on the two columns. It is characterized by including the following steps to unite both by fixing, and by employing this construction method, the construction can be easily performed.
(1) A recess drilling step of drilling a predetermined number of recesses on the inner surface side of the frame in at least a part of the upper and lower beams and the two columns constituting the beam column frame.
(2) A face material arrangement step of arranging a face material along a frame inner surface of the beam column frame while inserting a connecting member, which is previously bonded to the face material, into the recess.
(3) A solidifying material filling step of filling a joint material between the face material and the beam column frame and the concave portion with a solidifying material.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described in detail with reference to the drawings.
In addition, in the following description, the front view refers to a case when viewed from the direction of FIG.
In the description of each embodiment, the same constituent elements are denoted by the same reference numerals, and redundant descriptions are omitted.
[0017]
[Reinforcement structure]
As shown in FIGS. 1 and 2, the frame reinforcing structure 1 includes a beam column frame 10 of an existing building, and a steel brace 20 (face material) with a frame fixed to the inner surface of the frame.
[0018]
The beam column frame 10 is composed of columns 11 and 12 and beams 13 and 14 of an existing building, and left and right columns 11 and 12 standing upright at predetermined intervals, and beams 13 and 14 horizontally installed vertically. The frame structure is rigidly joined.
A plurality of cylindrical recesses 14a are drilled at a predetermined position near the center of the upper surface of the lower beam 14, and round holes 13a are drilled at a predetermined interval on the lower surface of the upper beam 13. .
In addition, the hole diameter of the recess 14a is preferably 2.5 to 3 times the diameter of the dowel reinforcing bar 5 (connecting member) described later, and the hole depth is preferably about 3 to 4 times that of the dowel reinforcing bar 5. is there.
[0019]
The steel brace 20 is a structural member for increasing the rigidity and proof stress of the beam post frame 10 and is composed of a frame 21 and a diagonal member 27. This frame 21 is formed by forming frame members 22 to 25 made of top and bottom and left and right H-shaped steels as a quadrilateral frame so as to form a mouth shape when viewed from the front.
A through-hole 23b is formed at a predetermined position on the lower flange 23a of the lower frame member 23 in the frame 21 for inserting the dowel reinforcing bar 5 inserted into the recess 14a of the beam column structure 10.
[0020]
The diagonal member 27 is also an H-shaped steel, and is joined between the center portion of the upper frame member 22 forming the frame 21 and the left and right lower corners of the frame 21 and is inverted in front view. It has a V shape.
In the frame 21, stud bolts may be provided by welding at predetermined positions of the frame members 22 to 25 forming the frame 21.
[0021]
In the frame reinforcing structure 1, flanges 22 a to 25 a on the frame inner surface side of the beam column frame 10 of the frame 21 are disposed so as to contact the frame inner surface of the beam column frame 10. The frame members 22 to 25 are arranged in the strong axis direction in the composition plane of the beam column structure 10. The plurality of dowel reinforcing bars 5 that are threaded are inserted into the recesses 14 a of the lower beam 14 in the beam column frame 10 through the plurality of through holes 23 b of the lower frame member 23 in the frame 21. The lower frame member 23 is fixed to the lower flange 23 a by the nut 6. Further, the solidified material 7 is provided in the joint portion 29 between the frame inner surface of the beam column frame 10 and the flanges 22a to 25a on the frame inner surface side of the frame members 22 to 25 forming the steel brace 20, and the recess 14a. Are interposed and filled so that both are integrated.
[0022]
Further, as shown in FIG. 3, the frame reinforcing structure 1 'of the present invention includes frame members 22' to 25 '(reference numeral 21' is a frame) constituting the steel brace 20 'and an H-section steel of an oblique member 27'. May be divided into a predetermined number and joined with splice plates 31 to 35 (attachment plates) and high-strength bolts 36 to 38 (fixing tools) constituting the joint (oblique material). 27 'is provided in a V-shape). The splice plates 31 to 35 provided between both members of the H-shaped steel joint portion formed in a divided manner sandwich both side surfaces of the web 22c ′ and the upper and lower flange surfaces 22a ′ and 22b ′. Each is provided.
Among them, a splice plate 31 provided on the surfaces of the flanges 22a ′ to 25a ′ facing the frame inner surface of the beam column frame 10, and a high-strength bolt 36 for fixing the splice plate 31 to the H-shaped steel are as follows. Concave and convex portions are formed to serve as a shear key. Therefore, the frame reinforcing structure 1 ′ prevents the occurrence of displacement on the flanges 22a ′ to 25a ′ of the H-shaped steel, and ensures the integrity of the beam column frame 10 ′ and the steel brace 20 ′. be able to.
[0023]
In addition, in the H-shaped steel, a steel bar, an angle member, a flat bar, or the like is welded to the flanges 22a ′ to 25a ′ facing the frame inner surface of the beam column frame 10 ′ at a predetermined interval. Generation of displacement on the flanges 22a ′ to 25a ′ of the shape steel is prevented, and the integrity of the beam column frame 10 ′ and the steel brace 20 ′ can be reliably ensured (not shown).
[0024]
[Construction method]
Next, a construction method of the frame reinforcing structure 1 according to the present invention will be described with reference to FIG.
This construction method is composed of (1) a recess drilling step, (2) a face material arranging step, and (3) a solidifying material filling step.
[0025]
(1) Concave drilling process This process is a process of drilling a plurality of recesses 14a on the upper surface of the lower beam 14 constituting the beam column frame 10, and can be performed by an existing method.
[0026]
(2) Face Material Arrangement Step This step is a step of performing an operation of arranging the steel brace 20 along the frame inner surface of the beam column frame 10.
Specifically, the frame 21 is provided along the frame inner surface of the beam column frame 10, and the work of placing the steel brace 20 on the frame inner surface of the beam column frame 10 is performed by joining the diagonal member 27 to the frame frame 21. Do.
[0027]
(3) Solidifying material filling step In this step, the dowel reinforcing bar 5 is joined to the steel brace 20 by inserting it into the concave portion 14a, and the joint portion 29 and the concave portion between the steel brace 20 and the beam column frame 10 are joined. 29 is a step of performing an operation of filling the solidified material 7 in 29.
Specifically, the dowel reinforcing bar 5 is inserted into the recess 14 a of the lower beam 14 of the beam column frame 10 through the through hole 23 b of the lower frame member 23 in the frame 21, and the nut 6 is inserted into the lower flange 23 a of the lower frame member 23. Let it settle.
Then, a formwork (not shown) is installed around the joints 29 of the beam pillar frame 10 and the steel brace 20, and the joints 29 and the recesses 14a are filled with the solidifying material 7 to integrate them.
Thereafter, curing is performed for a predetermined period, and the work is completed by removing the mold.
[0028]
In the face material arranging step, a steel brace to which a predetermined number of stud bolts (connecting members) are welded in advance is used, and the steel frame is installed along the inner surface of the beam column frame while inserting the stud bolt into the recess. After the braces are arranged, in the solidifying material filling step, the solidifying material can be filled in the joints between the steel braces and the beam column frame.
[0029]
As described above, in the frame reinforcing structure 1 of the present invention, the solidified material 7 hardened around the dowel reinforcing bar 5 inserted in the recess 14a and the dowel reinforcing bar 5 are integrated, and the beam column frame 10 and the steel brace 20 are integrated. A shear key is formed to transmit a shear force between the two. The shear key enhances the friction effect and the adhesion effect at the joint between the beam column frame 10 and the steel brace 20, and the dowel effect of the dowel reinforcing bar 5 is exhibited as the displacement at the joint increases. Therefore, according to the present invention, the combined effect of the shear key and the dowel reinforcing bar 5 can ensure the integrity of the beam column frame 10 and the steel brace 20, so that good shear transmission characteristics can be ensured even at the end. can do.
Therefore, it is not necessary to remove the finishing material even when the finishing material is applied to the inner surface of the beam column frame 10 without placing anchor reinforcing bars, so noise, vibration, and dust are generated during work. Can be prevented and work can be performed while using an existing building. In addition, since it is not necessary to remove the finishing material, waste generated with the work can be reduced.
[0030]
In addition, since a large number of anchor reinforcing bars are not placed, it is possible to prevent damage to the inner surface of the existing beam column frame, and it is possible to shorten the construction period and reduce the work cost.
In addition, since a recess 14a is formed in the lower beam 14 of the beam column frame 10 and the dowel reinforcing bar 5 is inserted into the recess 14a, the work can be performed. Can greatly improve the performance.
Further, since the frame members 22 to 25 constituting the frame 21 of the steel brace 20 are arranged in the strong axial direction in the frame of the beam column frame 10, the in-plane rigidity of the frame 21 is increased and deformation is reduced. be able to. Accordingly, in a state where the beam column frame 10 and the steel brace 20 are joined, it is possible to prevent the two from separating due to the deformation of the frame 21. As a result, the shear transmission performance at the joint between the beam column frame 10 and the steel brace 20 can be enhanced.
[0031]
In the frame reinforcing structure 1 of the present invention, the face material added to the frame inner surface of the beam column frame 10 is not limited to the steel brace 20 of the above embodiment, but is a reinforced concrete earthquake resistant wall (hereinafter referred to as “ It is possible to use “RC seismic wall” (not shown).
For example, when providing an RC earthquake-resistant wall, it can be performed by the following construction procedure.
First, dowel reinforcing bars are temporarily fixed in the recesses of the beam column frame, and a solidifying material injection hose is disposed in the recesses.
Next, the RC seismic wall is laid out in a normal procedure, and a formwork is installed around the RC wall to place concrete.
And a solidification material is inject | poured into the unfilled location where concrete filling is inadequate, and the said recessed part (injection of the solidified material to a recessed part is performed with the said hose).
[0032]
Further, in the above case, the RC earthquake-resistant wall can be added to the inner surface of the beam column frame 10 by an existing method using a precast concrete member (may be divided and formed).
[0033]
As mentioned above, although an example about a suitable embodiment was explained about the present invention, the present invention is not restricted to the embodiment concerned, and a design change is possible suitably in the range which does not deviate from the meaning of the present invention. In particular, it is needless to say that the shapes, dimensions, materials (materials), etc. of the beam column frame, the face material, the connecting member, and the solidifying material need to be appropriately determined according to the situation at the construction site.
[0034]
【The invention's effect】
According to the frame reinforcing structure of the present invention, the strength and rigidity of the joint between the beam column frame and the face material are increased and securely bonded, thereby sufficiently transmitting shear stress generated during an earthquake or the like. It becomes possible and construction can be easily performed.
[Brief description of the drawings]
FIG. 1 is a front sectional view showing a frame reinforcing structure of the present invention.
FIG. 2 is a cross-sectional view taken along the line XX in FIG.
FIG. 3 is a front sectional view showing another embodiment of the frame reinforcing structure of the present invention.
FIG. 4 is a side sectional view showing a conventional frame reinforcing structure.
[Explanation of symbols]
1,1 'Frame reinforcement structure 5 Dowel reinforcement (connecting member)
6 Nut 7 Solidified material 10 Beam column frame 11, 12 Column 13, 14 Beam 14a Recess 20, 20 'Steel brace (face material)
21, 21 ′ Frames 22 to 25, 22 ′ to 25 ′ Frame members 22 a to 25 a, 22 a ′ to 25 a ′ Flange 27, 27 ′ Diagonal materials 31 to 35 Splice plate (attachment plate)
36-38 High-strength bolt (fixing tool)

Claims (5)

A frame reinforcing structure in which a face material is fixed to a frame inner surface of a beam column frame including two columns to be erected and upper and lower beams horizontally disposed on the two columns,
A predetermined number of recesses are formed on the inner surface side of the upper and lower beams and at least a part of the two columns constituting the beam column frame, and the recess is joined to the face material. A connecting member is inserted,
A frame reinforcing structure characterized in that the beam column frame and the face material are integrated by filling the joints and the recesses between the face material and the beam column frame with a solidifying material. The face material includes a four-frame frame in which H-shaped steel is arranged so as to be in the strong axial direction of the beam column frame, and a diagonal member joined to the four-frame frame,
While forming the H-section steel in the four-frame framework by dividing it into a predetermined number,
A joining plate provided on a flange surface facing the inner surface of the frame of the beam column frame for joining the H-shaped steel formed separately, and a fixing tool for fixing the accessory plate to the H-shaped steel The frame reinforcing structure according to claim 1, wherein the frame is also used as a shear key. The face material includes a quadrilateral frame and a diagonal member joined to the quadruple frame,
The frame reinforcing structure according to claim 1, wherein a predetermined number of shear keys are provided on a surface of the four-frame frame facing a frame inner surface of the beam column frame. The followings are integrated by fixing the face material to the inner surface of the frame of the beam column frame comprising two columns to be erected and the upper and lower beams horizontally disposed on the two columns. A method for constructing a frame reinforcement structure, comprising a step.
(1) A recess drilling step of drilling a predetermined number of recesses on the inner surface side of the frame in at least a part of the upper and lower beams and the two columns constituting the beam column frame.
(2) A face material arrangement step of arranging a face material along the frame inner surface of the beam column frame.
(3) A connecting member is inserted into the recess and joined to the face material;
A solidifying material filling step of filling a joint material between the face material and the beam column frame and the concave portion with a solidifying material; The followings are integrated by fixing the face material to the inner surface of the frame of the beam column frame comprising two columns to be erected and the upper and lower beams horizontally disposed on the two columns. A method for constructing a frame reinforcement structure, comprising a step.
(1) A recess drilling step of drilling a predetermined number of recesses on the inner surface side of the frame in at least a part of the upper and lower beams and the two columns constituting the beam column frame.
(2) A face material arrangement step of arranging a face material along a frame inner surface of the beam column frame while inserting a connecting member, which is previously bonded to the face material, into the recess.
(3) A solidifying material filling step of filling a joint material between the face material and the beam column frame and the concave portion with a solidifying material.

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