JP4146808B2 - Frame reinforcement and its joint structure - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a reinforcing frame reinforcing surface member to be added to the inner surface of an existing beam column frame in order to increase the earthquake resistance of the structure, and a joint structure thereof.

  As a general reinforcement structure for existing buildings that have been judged to be insufficient in earthquake resistance, the internal structure of an existing beam column structure made up of columns and beams is placed inside a rectangular frame member made of steel. There is a reinforcing structure that increases the rigidity and proof strength of an existing building by adding a framed reinforcing frame (frame reinforcing material) provided with a steel brace (frame reinforcing member). Here, the inner surface means a space surrounded by the left and right column members and the upper and lower beam members.

  Conventionally, these reinforced frames with frames have been attached to existing buildings by an anchor method as shown in FIG. The anchor construction method includes (1) an anchor placing step in which anchor bolts 121 are placed on the inner surface of the existing beam column 120 at a predetermined pitch, and (2) studs 112 are provided on the outer circumference of the frame member 111 at predetermined intervals. A surface material arranging step for arranging the framed reinforcing frame 110; (3) a bar arranging step for arranging the spiral reinforcing bar 141 in the space 140 formed between the existing beam column frame 120 and the framed reinforcing frame 110; (4) Forming process for installing the formwork 130 at the joint between the frame member 111 and the existing beam column frame 120. (5) Injecting mortar into the space 140 between the frame member 111 and the existing beam column frame 120. It was performed by the injection | pouring process to perform (for example, refer patent document 1). However, when the anchor bolt 121 is driven, there is a problem that a large noise and vibration are generated, there are many work processes, and the work is complicated and troublesome. Therefore, as a method of attaching a framed reinforcing frame that does not generate noise or vibration to an existing building, a method using an adhesive method (for example, see Patent Document 2) or a method using an attachment fitting (for example, see Patent Document 3) has been developed. It has been put to practical use.

  As shown in FIG. 4B, the former bonding method is performed by injecting an adhesive such as epoxy resin into the beam member of the existing beam column frame 220 or the gap 240 between the column member and the framed reinforcement frame 210, and integrating them. A frame member 211 having an H-shaped steel flange formed on a rectangular outer peripheral surface and an inner peripheral surface is disposed on the inner surface of the existing beam column frame 220 with a predetermined gap 240. After that, the sealing material 230 is applied so as to seal off the gap 240 so that the injected adhesive does not flow out, and the adhesive is injected into the gap 240 to thereby form the frame with the existing beam column frame 220. This is a method for integrating with the attached reinforcing frame 210.

Further, as shown in FIG. 5, the latter mounting method using the mounting hardware is performed by inserting the beam member or the column member of the existing beam column frame 320 into the recess 330 of the U-shaped mounting bracket 312 and bonding them. This is a method of attaching a steel block wall 310 such as a steel block 311 to the mounting bracket 312 after fixing with an agent 340 or the like. A fixing bolt 313 is projected in advance from the mounting bracket 312 as a fixing bracket for the steel block 311. By attaching the steel block 311 to the fixing bolt 313, the steel block wall 310 and the existing steel block 311 are installed. Integration with the beam column frame 320 is possible.
JP 2001-132240 A ([0006]-[0024], FIG. 1) JP 11-71906 A ([0016]-[0019], FIG. 1) JP-A-58-146663 (first page, right column, line 20-page 2, lower left column, second line, FIGS. 2 to 4)

  However, in the existing beam column frame with a narrow beam width, when it is attached by the above-mentioned bonding method, the required bonding area is not secured only on the lower surface of the beam, so shearing between the existing beam column frame and the framed reinforcement frame is not possible. There is a problem that force transmission is not sufficient and sufficient reinforcement cannot be performed. In addition, particularly with respect to the bonding between the upper surface of the frame member and the beam member, self-shrinkage occurs due to the settling or curing of the adhesive itself, which may cause a gap in the joint portion under the beam. .

  In the construction method using one mounting bracket 312, since the beam member is inserted and fixed in the recess 330 formed by the mounting bracket 312, bonding on the side surface of the beam member is also performed, and a predetermined bonding area can be secured. However, it is connected only at two points by fixing bolts 313 between the mounting bracket 312 and the steel block wall 310, and the fixing width x ′ of the fixing points A and A by both bolts 313 and 313 is narrow, There is a problem that the degree of fixation with respect to rotation in the outward direction is low. That is, when a horizontal force at the time of an earthquake is applied to the existing beam column frame 320, there is a possibility that the joint portion by the fixing bolt 313 may be damaged or rotated in an out-of-plane direction to prevent shear resistance.

  The present invention is intended to solve the above-mentioned problems, and while securing a desired adhesion area to the beam member, the shear force between the existing beam column frame and the frame reinforcing surface material is obtained. It is an object of the present invention to propose a frame reinforcing face material capable of reliably transmitting the frame.

  In order to solve the above-mentioned problems, the present invention is installed on the inner surface of an existing beam column structure formed of column members standing on both sides and upper and lower beam members horizontally disposed on the column members on both sides. A frame member formed according to the shape of the inner surface of the existing beam column frame, and a frame reinforcing member for reinforcing the frame member, and is provided on the upper surface of the frame member. Is a frame reinforcing surface material, characterized in that mounting brackets forming recesses for holding the upper beam member are fixed at both ends of the frame member in the out-of-plane direction.

In such a frame reinforcing surface material, a concave portion for holding the beam member is formed on the upper surface of the frame member, so that the area of the lower surface of the beam member can be reduced in bonding the frame reinforcing surface material to the existing beam column frame. In addition, since a part of the side surface of the beam member is also bonded, a desired bonding area can be secured even for an existing beam column frame with a thin beam member. It is possible to reliably perform integration with. In addition, since the attachment of the mounting bracket to the frame member is fixed at the front and rear end portions of the upper surface of the frame member, it is integrated with the frame member to absorb the stress applied to the existing beam column frame and in the out-of-plane direction. Can be prevented.
In addition, if the frame member is provided with a recess reinforcing member for suppressing deformation of the mounting bracket that forms the recess, the pressure due to grouting or some load is applied to the recess. This is preferable because deformation can be prevented.

Further, the structure for joining the frame reinforcing face material to the existing beam column frame is formed by holding the upper beam member by the concave portion and in a joint portion formed between the concave portion and the upper beam member. It is characterized by filling and integrating the filler.
Here, holding means a state in which the upper beam member is inserted into the recess with a predetermined gap, and the upper beam member and the frame reinforcing surface material are integrated by filling the gap with a filler. Is possible. Further, the filler is not limited as long as it can be integrated by hardening after filling the gap between the existing beam column frame and the frame reinforcing face material, and is not limited to mortar or grout. In addition to materials, an epoxy resin adhesive, a urethane resin adhesive, or the like may be used.

  The structure for joining the frame reinforcement face member to the existing beam column frame can be filled with the filler with the joint between the beam member and the concave portion opened at the time of construction. Therefore, the filling material can be filled without any gaps while confirming the filling status of the filling material, so that the existing beam column frame and the frame reinforcing surface material are securely joined and the shear force is transmitted. It becomes possible.

  According to the frame reinforcing face material and the structure of the frame reinforcing face material according to the present invention, the filling of the filler can be easily confirmed and the necessary bonding area can be secured. It is possible to reliably transmit the shearing force between the surface material and the existing beam column structure, and to reliably reinforce the existing building determined to have insufficient earthquake resistance.

  Preferred embodiments of the present invention will be described with reference to the drawings. In the description, the same reference numerals are used for the same elements, and duplicate descriptions are omitted.

<First Embodiment>
In this embodiment, for the purpose of increasing the seismic strength of an existing building, a case will be described in which a framed reinforcing frame, which is a frame reinforcing face material, is installed on the inner surface of each existing beam column frame of the existing building.
FIG. 1 is a perspective view showing the entire framed reinforcing frame 10 according to the present embodiment, and FIG. 2 is a cross-sectional view showing a joint portion between the framed reinforcing frame 10 and the upper beam member 22. In addition, front and rear, right and left in description shall be unified in the direction shown in FIG.

[Constitution]
The existing beam column structure 20 is formed by a column member 21 (only the right column member is shown in FIG. 1) standing upright and left, and upper and lower beam members 22, 23 laid horizontally on the column member 21. Yes. A floor member 24 (only the lower floor member is shown in FIG. 1) is integrally joined to the upper and lower beam members 22 and 23. In the present embodiment, a description will be given of an existing building in which the upper and lower beam members 22 and 23 are thin in the front and rear, and about 1/3 of the thickness of the column member 21.

  The frame-equipped reinforcing frame 10 includes a four-round frame member 11 made of a steel frame material, a brace member (frame reinforcement member) 16 that is a steel frame material for reinforcing the frame member 11, and front and rear ends of the frame member 11. The cross section installed in is composed of a rising steel plate (mounting bracket) 15 made of an L-shaped steel plate.

  The frame member 11 is made of H-shaped steel, and is vertically installed on the left and right vertical members 14 and the upper and lower ends of the vertical member 14 so that the flange surface of the H-shaped steel comes into contact with the existing beam column frame 20. The upper and lower horizontal members 12 and 13 are formed in a rectangular shape. Bonded steel plates 17 are attached to the left and right ends of the upper and lower horizontal members 12 and 13 so as to close the opening surface of the H-shaped cross section and have a trapezoidal shape. Note that the width of the flange on the side in contact with the lower beam member 23 of the lower horizontal member 13 is set to a width wider than the front and rear thicknesses of the lower beam member 23 by a predetermined length, so that the framed reinforcing frame 10 and the existing beam column A bonding area required for integration with the frame 20 is secured. Further, the material of the frame member 11 is not limited to the H-shaped steel as long as the proof stress necessary for the frame-equipped reinforcing frame 10 can be expressed.

  As shown in FIG. 2, the upright steel plate 15 is welded to both ends in the front-rear direction (out-of-plane direction) of the upper flange 12 a on the upper beam member 22 side of the upper horizontal member 12. 15 and 15 and the upper surface of the upper flange 12a are configured such that a recess 30 is formed. The rising steel plate 15 has the same thickness as the upper flange 12a, has the same length as the left and right extension of the upper horizontal member 12, and has a height higher than that of the upper surface of the upper horizontal member 12. Desired height that can secure a bonding area required for the integration of the upper beam member 22 and the framed reinforcing frame 10 by adding the bonding area of the raised steel plates 15 and 15 to the bonding surface with the lower surface of the beam member 22 It is comprised from the steel plate which has. Further, the distance between the upper ends of the front and rear rising steel plates 15 is wider than the width of the upper beam member 22 of the existing beam column frame 20, and the upper frame member 20 is installed on the inner surface of the existing beam column frame 20. A predetermined opening 32 is formed between the front and rear of the beam member 22 and the upper end of the raised steel plate 15 (see FIG. 2).

  Between the upper and lower flanges 12a and 12b of the upper horizontal member 12, a rib plate (concave reinforcing member) 15a that suppresses deformation of the rising steel plate 15 is provided with a predetermined interval. In the rib plate 15a, the length of the upper side is the length from the web 12c of the upper horizontal member 12 to the bending point of the raised steel plate 15, and the length of the lower side is the length from the web 12c to the tip of the lower flange 12b. Further, the height is made of a trapezoidal steel plate equivalent to the height of the web 12c.

  In addition, the shape dimension of the upright steel plate 15 is suitably adjusted according to the assumed stress so that the adhesive strength and rigidity necessary for joining the upper beam member 22 and the framed reinforcing frame 10 can be secured. Moreover, the attachment method of the rib plate 15a is not limited, For example, it selects suitably, such as performing by welding joining. Further, the installation interval and the number of locations of the rib plate 15a are set as needed from the relationship between the proof stress of the rising steel plate 15 and the stress applied to the rising steel plate 15.

  The brace member 16 is a member disposed in an oblique direction from one corner of the frame member 11 to the diagonal. Here, the brace member 16 and the frame member 11 are joined by welding. In the present embodiment, the brace member 16 is composed of one H-shaped steel. However, the present invention is not limited to this, and for example, a brace with a damper may be used. In addition, one brace member 16 is disposed diagonally to the frame member 11, but the present invention is not limited to this, and the strength required for the brace member 16 and the installation location of the framed reinforcing frame 10 are not limited thereto. Depending on the purpose of use, a so-called K-type brace method, V-type brace method, X-type brace method, or the like may be used.

  The frame-equipped reinforcing frame 10 holds the upper beam member 22 with a predetermined gap 31 by a recess 30 formed on the upper surface of the upper horizontal member 12 (see FIG. 2), and the lower beam member 23 and the lower side It is also installed between the horizontal member 13 with a predetermined gap. Then, by filling the gaps formed between the framed reinforcement frame 10 and the existing beam column frame 20 with a filler, the framed reinforcement frame 10 and the existing beam column frame 20 are integrated. Yes. Here, the contact portions between the left and right column members 21 and 21 and the left and right vertical members 14 are filled and bonded as necessary.

  The filling material is injected into the concave portion 30 from the opening 32 formed between the upper end of the upright steel plate 15 and the upper beam member 22. This is performed until the filler rises to a predetermined position on the side surface of the beam member 22. On the other hand, the filler is injected into the gap between the frame-equipped reinforcing frame 10 and the left and right column members 21 and 21 and the lower beam member 23 so that a mold frame (not shown) for filling the filler is closed to close the gap. It is done after installing before and after. At this time, the mold is provided with an air vent hole on the upper side, and filling is completed when the filler flows out from the air vent hole. Here, the material of the filler to be filled in the gap is not limited. For example, an adhesive such as an epoxy resin, a cement-type filler, or a combination of these is selected and used. And

[Action and effect]
The framed reinforcing frame 10 according to the present invention has a concave portion 30 formed in the upper portion in advance, and a gap 31 between the upper beam member 22 and the upper horizontal member 12 is formed in order to inject the filler using the concave portion 30. Since it is not necessary to seal and the labor of the formwork can be saved, the construction period can be shortened.

  Further, regarding the injection of the filler into the gap 31 between the upper beam member 22 and the upper horizontal member 12, the filler is injected from above by the weight of the filler, and filled to a predetermined height on the front and rear side surfaces of the upper beam member 22. Since it is performed until the material rises, it is possible to reliably fill the upper beam member 22 directly below.

  Moreover, since the opening part 32 is formed between the side surface of the upper beam member 22 and the upright steel plate 15 at the time of the filling material injection operation, the filling can be surely performed while checking the filling state. . Therefore, it is not necessary to confirm the filling by a hitting sound investigation, and it is possible to save time and noise from the hitting sound. Therefore, it is also effective for the reinforcement work of the building in service.

  In addition, for an existing building where the thickness of the beam is thin and the required adhesion area cannot be ensured only by the lower surface of the beam, in order to inject the filler to a predetermined position on the side surface of the upper beam member 22, A desired bonding area can be secured.

  In addition, since the concave portion 30 is also constructed by welding the upright steel plates 15 to both ends of the upper flange 12a of the upper horizontal member 12 of the conventional framed reinforcing frame 10, the framed reinforcing frame 10 is manufactured. It is possible to manufacture without requiring special trouble. With this configuration, since the upper flange 12a and the front and rear raised steel plates 15 are integrated and directly joined to the upper beam member 22, the concave portion 30 has the existing beam column frame 20 and the framed reinforcing frame 10 Various stresses generated in the joint portion can be directly transmitted to the frame-equipped reinforcing frame 10 without being concentrated on a part of the concave portion 30. Further, since the rising steel plate 15 is welded at the fixing points A and A at both ends of the upper flange 12a, the fixing width x of both the fixing points A and A is relatively wide, and rotation in the out-of-plane direction (front-rear direction). The degree of fixation with respect to is high.

  Further, the framed reinforcing frame 10 holds the upper beam member 22 by the upright steel plates 15 erected before and after the upper surface of the upper horizontal member 12, so the framed reinforcing frame 10 and the existing beam column frame 20. Even before the integration is established, the rising steel plate 15 prevents the framed reinforcing frame 10 from falling down, and safety is ensured.

  Furthermore, since the rib plate 15a that suppresses the deformation of the rising steel plate 15 is provided, even when a large load is applied to the rising steel plate 15, the rib plate 15a absorbs the stress applied to the rising steel plate 15. There is no deformation, and the framed reinforcing frame 10 and the existing beam column frame 20 are not separated. Therefore, for example, even when a stress is applied to the upper end of the rising steel plate 15 that spreads back and forth around the joint with the flange 12a by injection of a filler, the lower portion of the rising steel plate 15 is formed by the rib plate 15a. Because it supports, it can be suppressed. In addition, the shape of the rib plate 15a is not limited to a trapezoid, and for example, if the shape can cover the front and back of the rising steel plate 15, the deformation of the rising steel plate 15 can be further suppressed. It may be set as appropriate according to the situation. Further, as a reinforcement of the rising steel plate 15, a triangular rib 15 b made of a triangular steel plate may be disposed inside the corner portion of the rising steel plate 15. With this configuration, the rising steel plate 15 is moved back and forth. The triangular ribs 15b also serve as a shear key, and can prevent slipping on the surface of the frame member 11 while suppressing the spreading.

<Second Embodiment>
FIG. 3 is a side view showing a joint portion between a framed reinforcing frame and a beam member according to the second embodiment.

  As shown in FIG. 3, the framed reinforcing frame 10 ′ according to the second embodiment includes a rising steel material (mounting bracket) 15 ′ having a U-shaped cross section on the upper flange 12 a of the upper horizontal member 12, By installing so that the opening surface faces upward, the recess 30 is formed and the upper beam member 22 can be held.

  Here, the raised steel material 15 ′ is welded to both ends of the upper flange 12 a in the front-rear direction (out-of-plane direction) and is firmly integrated with the frame member 11. Therefore, since the rising steel plate 15 ′ is supported by the surface of the upper flange 12a, the stress applied to the concave portion 30 due to an earthquake or the like is absorbed by the surface of the upper flange 12a and transmitted to the framed reinforcing frame 10 ′. The existing beam column 20 can be reinforced.

  In addition, since the other structure of frame reinforcement frame 10 'concerning 2nd Embodiment and the joining structure to the existing beam pillar frame 20 are the same as that of 1st Embodiment, detailed description is abbreviate | omitted. Further, the operation and effect of the framed reinforcing frame 10 'according to the second embodiment and the joint structure thereof are also the same as those in the first embodiment, and thus detailed description thereof is omitted.

Heretofore, examples of preferred embodiments have been described for the present invention. However, the present invention is not limited to the above-described embodiment, and the design of each of the above-described components can be appropriately changed without departing from the spirit of the present invention.
For example, in the present embodiment, a framed reinforcing frame having a brace member is used as a frame reinforcing surface material. However, the present invention is not limited to this. For example, the frame reinforcing surface material is formed by an iron plate panel. Needless to say, the structure of the frame reinforcing face material such as forming is appropriately determined according to the situation.

In addition, the concave portion is formed for the entire extension of the upper horizontal member. However, the concave portion is partially formed if the strength necessary for adhesion between the framed reinforcing frame and the existing beam column frame can be expressed. It is good.
In addition, the upper beam member is formed with a recess in the upper horizontal member and the framed reinforcing frame is attached. However, if necessary, the left and right vertical members and the lower horizontal member are formed with recesses to form a column member. It is also possible to hold and bond the lower beam member.

  Furthermore, in the present embodiment, the frame member is a rectangle formed by the upper and lower horizontal members and the left and right vertical members. However, the shape of the frame member is not limited to the rectangle. For example, it is appropriately formed according to the shape of the existing beam column frame such as a shape having a haunch.

It is a perspective view showing the whole framed reinforcement frame concerning a 1st embodiment. It is a side view which shows the junction part of the reinforcement frame with a frame which concerns on 1st Embodiment, and a beam member. It is a side view which shows the junction part of the reinforcement frame with a frame concerning 2nd Embodiment, and a beam member. It is sectional drawing which shows the attachment condition to the existing beam column frame of the conventional framed reinforcement frame, (a) shows an anchor construction method, (b) shows an adhesion construction method. It is sectional drawing which shows the attachment condition to the existing beam pillar frame of the conventional steel block wall.

Explanation of symbols

10 Reinforced frame with frame (face material for frame reinforcement)
11 Frame member 12 Upper horizontal member 15 Rising steel plate (mounting bracket)
15a Rib plate (recessed reinforcing member)
16 Brace member (frame reinforcement member)
20 Existing beam column structure 21 Column member 22 Upper beam member 23 Lower beam member 30 Concave portion 31 Gap 32 Opening portion

Claims (3)

A frame reinforcing surface material installed on the inner surface of an existing beam column structure formed of column members standing on both sides and upper and lower beam members horizontally disposed on both side column members,
A frame member formed in accordance with the inner surface shape of the existing beam column structure, and a frame reinforcing member for reinforcing the frame member,
A frame reinforcing surface material, characterized in that, on the upper surface of the frame member, mounting brackets that form recesses for holding the upper beam member are fixed at both ends in the out-of-plane direction of the frame member. .   2. The frame reinforcing face material according to claim 1, wherein the frame member is provided with a recessed portion reinforcing member for suppressing deformation of the mounting bracket forming the recessed portion. The joint structure between the existing beam column frame and the frame reinforcing face material according to claim 1 or 2 installed on an inner surface of the existing beam column frame,
The frame reinforcing surface material is characterized in that the upper beam member is held by the concave portion, and a gap formed between the concave portion and the upper beam member is filled and integrated. Junction structure.

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