JP5308012B2 - Reinforcement structure for wall column members - Google Patents

Description

  The present invention relates to a reinforcing structure for a walled column member.

Among existing reinforced concrete structures, there is a high possibility that when a large seismic force is applied, a shear failure occurs in the column member and the structure collapses.
For this reason, there is a case in which a column member of an existing structure is reinforced so that a shear failure does not occur even when a large seismic force is applied. Such reinforcement to existing structures is not only important for preventing the collapse of structures, but also the construction costs due to new remodeling and the society where service is suspended during the period required for remodeling. It is also important to minimize the impact on life.

  2. Description of the Related Art Conventionally, as a method for reinforcing a column member, a method for improving the proof stress of a structure by increasing the thickness of a member by using a concrete-increase method, a steel plate winding method, or the like is generally performed.

  Moreover, in patent document 1, as shown to Fig.7 (a), with respect to the reinforced concrete pillar 110 of a cross section rectangle, the corner pieces 120,120, ... arrange | positioned at each corner | angular part are bolts 130,130, ..., etc. The reinforcement structure which compresses the pillar 110 by tightening by and suppresses the expansion and cracking of the pillar 110 is described.

  However, in the concrete reinforcement method and the steel sheet winding method, the thickness of the member after reinforcement will increase. In some cases, the building limits could not be satisfied.

  Moreover, the reinforcement structure which arrange | positions the reinforcement members 120 and 130 so that the circumference | surroundings of the pillar 110 of patent document 1 may be enclosed is a pillar member with a wall in which structural walls, such as an earthquake-resistant wall and a sleeve wall, were provided integrally. In the case of application, since it is necessary to cut the wall partially, it is necessary to reinforce the cut part and the construction is complicated and the construction cost is expensive.

  Therefore, in Patent Document 2, as shown in FIG. 7 (b), a reinforcing member is inserted in the front-rear direction of the column 210 from one surface side with respect to the existing concrete column 210 whose wall members 211, 211 are connected to the side surfaces. A reinforcing hole is formed in which the shear reinforcing member 220 is inserted into the reinforcing member insertion long hole and the remaining space is filled with a filler such as a grout material to integrate the shear reinforcing member 220 and the column 210 together. A structure is disclosed. Thereby, the shear reinforcement is performed without increasing the member thickness of the existing column 210 and without damaging the wall member 211 connected to the column 210.

JP 2000-34842 A JP 2001-110365 A

However, in the shear reinforcement method, it is necessary to arrange a large number of shear reinforcement members 220 over the entire column member 210 for the purpose of expressing sufficient proof strength against a large shear force generated by a large earthquake or the like. The construction required a long time due to the drilling and filling of the deep holes for inserting the reinforcing members.
On the other hand, some of the structures in service, such as railway structures, cannot be stopped for a long time and can only be reinforced during a limited time such as midnight. There is.

  In addition, since the shear reinforcement method is reinforcement from only one direction, it exhibits sufficient strength against shear failure occurring in the front-rear direction of the column member, but against shear failure occurring in the left-right direction of the column member. In some cases, a sufficient effect may not be obtained, and there is a risk of collapsing when shear fracture occurs in this direction.

  The present invention is intended to solve the above-described problems, and provides a reinforcing structure for an existing wall-mounted column member that can reinforce an existing structure by a short time construction. This is the issue.

In order to solve the above-mentioned problems, a reinforcing structure for a columnar member with a wall according to the present invention includes a column member having a wall member connected to a side surface, and a reinforcing body disposed in a direction intersecting with the vertical bars of the column member. A reinforcing structure of a wall-mounted column member comprising a plurality of anchor members for fixing the reinforcing body, wherein the reinforcing body includes a plurality of strip-shaped members disposed at intervals in the vertical direction. The band-shaped member is fixed to the surface of the column member and the wall member along the corner of the connecting portion between the column member and the wall member, and the vertical distance between the band-shaped members is The reinforcing member is formed in a lattice shape by combining the plurality of strip-shaped members, and has a column fixing portion and a wall fixing portion as the plurality of strip-shaped members. And L-shaped in plan view according to the corners of the column member and the wall member A first L-shaped band-shaped member formed in a plan view, a second L-shaped band-shaped member formed in an L-shape in plan view according to the front and side surfaces of the column member, and the first L-shaped band-shaped member And a straight belt-shaped member that connects the second L-shaped belt-shaped member .

According to such a reinforcing structure of the walled column member, the reinforcement is provided by arranging the reinforcing body having a plurality of strip-like members at intervals in the vertical direction. The construction can be performed in a shorter time than the conventional reinforcing structure.
In addition, the installation of the reinforcing body does not require a large number of deep holes in the column member, and therefore it can be performed by simple construction.
Furthermore, the reinforcing body is disposed along the corner (entrance corner) of the connecting portion between the column member and the wall member, that is, the reinforcing body is disposed across the column member and the wall member, thereby acting stress. Reinforcing effect to disperse can be expected.

Further, the vertical spacing of the reinforcing bodies is, member thickness less magnitude der because of the pillar member, even when the shear fracture has occurred, to prevent conceive out of the main reinforcement of the pillar member that Do and is possible.

Incidentally, before Symbol reinforcing body, and a pillar fixing portion and the wall fixing part, it is provided with a belt-shaped member formed in plan view L-shape in accordance with the corner between the wall member and the pillar member In addition, a rib plate standing upright to be orthogonal to the belt-like member may be provided.

  Moreover, if the length of the said wall fixing | fixed part is below the member thickness of the said column member, since the size of a reinforcement body is attained, ensuring the function as a reinforcement body, workability | operativity improves.

  In addition, if the plurality of anchor materials are arranged at intervals up to about half of the member thickness of the column member or the wall member at the maximum, even if shear failure occurs, the belt-shaped member made of the anchor material Can be maintained.

  Further, if the embedded length of the anchor material is not less than 15 times the diameter of the anchor material, it is possible to suppress the progress of oblique cracks by the anchor material even when shear fracture occurs. Is preferable.

  According to the reinforcing structure for a wall-mounted column member of the present invention, it is possible to reinforce an existing structure by a short time construction.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the 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>
A first embodiment (reference embodiment) will be described with reference to FIGS.
As shown in FIG. 1, the reinforcing structure 1 for a wall-mounted column member according to the first embodiment is arranged along a column member 10 having wall members 11 and 11 connected to the side surfaces and the surface of the column member 10. , And a plurality of anchor members 30, 30,... For fixing the reinforcing body 20. The reinforcing body 20 according to the first embodiment is composed of a plurality of strip-shaped members 21, 21,... Arranged horizontally with a distance P1 therebetween in the vertical direction.

As shown in FIG. 1, the column member 10 is formed in a rectangular cross section, and is arranged in a state in which the vertical bars (main bars) R, R,... It is a reinforced concrete member that has been reinforced.
Wall members 11 and 11 are integrally connected to the left and right side surfaces of the column member 10.
Here, the front-rear and left-right directions in the first embodiment are unified to the directions shown in FIG.

  As shown in FIG. 2, the band-shaped member 21 is configured to include a U-shaped column fixing portion 22 and linear wall fixing portions 23 and 23 by bending a flat steel plate. It is disposed across the column member 10 and the wall members 11 and 11 so as to follow the surface of the corner (entrance corner) of the connecting portion with the wall member 11. Further, as shown in FIG. 1, the belt-like member 21 is provided in a plurality of stages so as to be horizontal and spaced apart from each other in the vertical direction.

An interval P1 between the belt-like members 21 in the vertical direction (a distance from the center to the center of the belt-like members 21 and 21 arranged above and below) is configured to be equal to or less than the member thickness T1 of the column member 10. Here, the member thickness T <b> 1 of the column member 10 in this embodiment refers to the thickness of the column member 10 in the front-rear direction, that is, the thickness of the column member 10 in the direction orthogonal to the wall member 11.
Note that the vertical interval P1 between the belt-like members 21 is such that the column member 10 retains its own weight before the earthquake, even if abrupt failure occurs due to shear failure, and the column member 10 has a sudden interval. The thickness of the column member 10 is set to be equal to or less than the member thickness T <b> 1 so that the reinforcement can be performed to prevent the collapse.

  In the present embodiment, as shown in FIG. 3A, the column fixing part 22 and the wall fixing parts 23 and 23 are integrally formed as the band member 21, but the configuration of the band member 21 is limited. It can be set as appropriate. For example, as shown in FIG. 3B, the reinforcing member 21 ′ may be configured by combining L-shaped belt-like members 23 ′ and 23 ′ and a U-shaped belt-like member 22 ′. As shown in FIG. 3C, the reinforcing member 20 ″ may be configured by combining L-shaped strip members 22 ″, 22 ″, 23 ″, 23 ″.

As shown in FIG. 2, the column fixing portion 22 is a portion along the surface of the column member 10, and in this embodiment, surrounds from one corner of the column member 10 and the wall member 11 to the other corner. A portion formed in a U-shape corresponds to this. Note that the shape of the column fixing portion is not limited, and it is sufficient that the column fixing portion has a length equal to or greater than the bar arrangement pitch of the vertical bars (main bars) R.
The wall fixing portion 23 is a linear portion formed with a length equal to or less than the member thickness T of the column member 10 and is fixed to the wall member 11.

The belt-like member 21 is pressure-bonded to the surfaces of the column member 10 and the wall member 11 by a plurality of anchor members 30, 30,... Arranged at a predetermined interval a1.
As shown in FIG. 3A, anchor holes 24, 24,... Are formed in the belt-like member 21 in advance at the same interval as the bar arrangement pitch of the vertical bars R1 of the column member 10. The pitch of the anchor holes 24 is not limited as long as it is not more than half the thickness of the column member 10 or the wall member 11. That is, the interval between the anchor holes 24 formed in the column fixing portion 22 is equal to or less than half the member thickness T1 of the column member 10, and the interval between the anchor holes 24 formed in the wall fixing portion 23 is equal to the member thickness T2 ( (See FIG. 2).

  In addition, the anchor hole 24 is formed on the column member 10 and the wall member 11 so as not to damage the main bars (vertical bars R and the like) arranged in the column member 10 and the wall member 11 due to the construction of the anchor material 30. It is assumed that the anchor material 30 is formed at a position where it does not come into contact with the longitudinal bars R or the like based on the arrangement chart at the time of construction and the information on the nondestructive test. Furthermore, the anchor hole 24 may be formed on site depending on the arrangement of the anchor material 30.

  As the anchor material 30, a commonly used anchor pin is used, and as shown in FIG. 2, as shown in FIG. 2, the vertical bars (main bars) in which the interval a1 between the anchor materials 30 is arranged in the wall structure 10. It arrange | positions so that it may become the space | interval same as the space | interval of R. Such an anchor material 30 may be appropriately selected from known anchor pins such as a mechanical anchor pin, a resin-bonded anchor pin, and a resin-bonded mechanical anchor pin.

  Here, the interval a1 of the anchor member 30 is “if the rod member requires a shear-reinforced steel material for calculation, the stirrup interval is ½ times the effective height of the member and 300 mm or less. The distance a1 between the anchor members 30 also having a function as a shear reinforcement body of the column member 10 is determined based on the description of the guideline “Must be specified” (from the Japan Standards for Concrete Structures Structural Performance Review). 10 or the wall thickness of the wall member 11 is set to be less than half of the member thicknesses T1 and T2, and the shear reinforcement strength by the anchor material 30 is also performed.

The embedded length of the anchor material 30 is 15 times or more the diameter of the anchor material 30 and more than twice the covering thickness of the vertical bars (main bars) R, and the member thickness T1 of the column member 10 or the wall member 11 It is set to 1/2 or less of T2.
Here, the embedding length of the anchor material 30 is set to be not less than twice the covering thickness so that the tip of the anchor material 30 is disposed inside the covering thickness, and “when subjected to bending and shearing” The anchor embedding length is set to 15φ or more ”(“ Guide for Post-construction Anchor Method Design and Construction ”, Railway Technical Research Institute). The embedding length of the anchor material 30 is not limited to this.

  As described above, according to the reinforcing structure 1 according to the first embodiment, the members of the column member 10 in the vertical direction against the oblique cracks generated along the vertical bars (main bars) R in the upper and lower portions of the column member 10. The plurality of strip-shaped members 21, 21,... Arranged at intervals equal to or less than the thickness T1 suppress the progress of cracks, thereby preventing the column member 10 from rapidly collapsing.

  Moreover, since the strip | belt-shaped member 21 is being fixed by the anchor material 30,30, ... arrange | positioned by the same spacing as the reinforcement pitch of the vertical reinforcement (principal reinforcement) R, when a shear failure arises in the column member 10, It is possible to suppress the protrusion of the longitudinal (main) muscle R.

  Further, since the embedding length of the anchor member 30 for fixing the belt-like member 21 is more than twice the covering thickness of the column member 10, even when oblique cracking or the like occurs in the column member 10 due to shear failure, The anchor member 30 is prevented from abruptly breaking due to the fixing force, and the column member 10 is prevented from rapidly collapsing.

Moreover, since the embedding length of the anchor member 30 is 1/2 or less of the member thickness T1 or T2 of the column member 10 or the wall member 11, the anchor member 30 can be installed without requiring deep drilling. Excellent workability.
Moreover, since positioning of the anchor material 30 is performed using the anchor hole 24 previously formed in the band-shaped member 21 using the band-shaped member 21 as a ruler, the workability is excellent.

  Therefore, according to the reinforcing structure 1 according to the first embodiment, the existing walled column member 10 can be reinforced in a short time. Even for a certain structure, the safety of the user can be ensured by a short construction. In other words, even if shear failure occurs in the column member 10, it is possible to suppress the progress of abrupt failure, so that by preventing the column member 10 from collapsing suddenly, the user's It is possible to ensure safety.

  Further, according to the reinforcing structure 1, even when a shear failure occurs due to a large stress acting due to a large earthquake or the like, the structure can be secured so that, for example, a time sufficient for a user to evacuate can be secured. It is possible to construct a reinforcing structure capable of preventing the object from being quickly collapsed in a short time. Therefore, depending on the use situation of existing structures, it is not necessary to build a reinforced structure that expresses sufficient proof strength against the stress assumed in a large earthquake, etc. It can be suitably used when reinforcement is required.

In addition, the reinforcing structure 1 has a simple construction in which the relatively light belt-like member 21 is fixed by the anchor material 30, and thus has excellent workability and low material costs. In addition, since the handling of the members is easy, it is possible to save labor and improve safety during construction.
In addition, since a large number of holes and grout injection are not required, it is possible to minimize adverse effects on the surrounding environment such as noise and dust. Also, it doesn't pollute the site.

  The band-shaped member 21 may be attached to the walled column member 10 by embedding (driving) the anchor material 30 with the band-shaped member 21 installed on the surfaces of the column member 10 and the wall member 11. Alternatively, after the anchor member 30 is embedded in the column member 10 and the wall member 11, the belt-like member 21 may be fixed to the head of the anchor member 30.

In the first embodiment, a flat steel plate is used as the belt-like member 21, but the material constituting the belt-like member 21 is not limited. For example, a steel plate having a U-shaped cross section is used. Alternatively, a known material such as a steel plate having an L-shaped cross section or a square steel pipe may be selected and used.
Moreover, when using a square steel pipe as the strip | belt-shaped member 21, you may fill the inside of a square steel pipe with fillers, such as mortar and concrete.

  In the first embodiment, the belt-like member 21 is arranged horizontally. However, the belt-like member 21 is not necessarily arranged horizontally as long as the belt-like member 21 is arranged so as to intersect with the vertical bars (main bars) R. It does not need to be provided, and may be disposed obliquely.

<Second Embodiment>
Next, the second embodiment will be referred to with reference to FIG.
As shown in FIG. 4, the reinforcing structure 2 for a wall-mounted column member according to the second embodiment includes a column member 10 having wall members 11, 11 connected to the side surfaces, and the column member 10 and the wall members 11, 11. Is provided with a plurality of anchor members 30, 30,... For fixing the reinforcing body 20.

The reinforcing body 20 is a member formed in a lattice shape by combining a plurality of strip-shaped members 21, 21,... Formed by bending a flat steel plate, and includes a front surface and left and right side surfaces of the column member 10. It is formed so as to cover.
Here, the vertical interval P1 between the strip-shaped members 21, 21,... (The distance from the center to the center of the strip-shaped members 21, 21 disposed above and below) is equal to or less than the member thickness T1 of the column member 10. It is configured as follows. Here, the member thickness T <b> 1 of the column member 10 in this embodiment refers to the thickness of the column member 10 in the front-rear direction, that is, the thickness of the column member 10 in the direction orthogonal to the wall member 11.

As shown in FIGS. 4A and 4B, the reinforcing body 20 is a member having a column fixing portion 22 and a wall fixing portion 23 and formed in an L shape in plan view. And an L-shaped band member 25 disposed at a corner formed by the wall member 11.
Further, a plurality of L-shaped band members 27, 27,... Are also arranged at the corners between the front surface and the side surface of the column member 10. Further, the L-shaped strip members 25 and 27 are connected to each other by a plurality of straight strip members 26, 26,... Disposed obliquely on the surface of the column member 10.

  The L-shaped belt members 25 and 27 and the straight belt member 26 are connected to each other by being fixed by an anchor member 30 inserted through the overlapped portion in a state of being overlapped with each other.

  Here, each of the belt-like members 25, 26, 27 is formed to have a length that is at least larger than the bar arrangement interval of the vertical bars (main bars) R.

In the second embodiment, the reinforcing body 20 is configured in a lattice shape by combining the L-shaped strip members 25 and 27 and the straight strip member 26. However, the reinforcing member 20 is formed according to the shape of the columnar member 10 with the wall. Alternatively, the belt-like members may be combined to form a lattice. Moreover, the connection method of each strip | belt-shaped member 25,26,27 is not limited.
In the second embodiment, the L-shaped band members 25 and 27 are arranged horizontally, but the L-shaped band members 25 and 27 may be arranged obliquely.

  In addition, since the configuration of the reinforcing structure 2 according to the second embodiment is the same as that of the reinforcing structure 1 shown in the first embodiment, detailed description thereof is omitted.

  As described above, according to the reinforcing structure 2 according to the second embodiment, since the reinforcing member 20 formed in a lattice shape covers the surface of the column member 10 in a plane, shear failure occurs in the column member. Even so, the progress of destruction can be suppressed and rapid collapse can be prevented.

Moreover, compared with the conventional reinforcement structure covered with a steel plate, since reduction of material cost and improvement of workability can be aimed at, it is suitable.
In addition, since the effect by the reinforcement structure 2 which concerns on 2nd Embodiment is the same as that of the reinforcement structure 1 shown in 1st Embodiment, detailed description is abbreviate | omitted.

<Third Embodiment>
Next, a third embodiment (reference embodiment) will be described with reference to FIG.
As shown in FIG. 5, the reinforcing structure 3 for a wall-mounted column member according to the third embodiment includes a column member 10 having wall members 11, 11 connected to the side surfaces, and the column member 10 and the wall members 11, 11. And a plurality of anchor members 30, 30,... For fixing the reinforcing body 20 to the column member 10 and the wall members 11, 11.

  As shown in FIGS. 5A and 5B, the reinforcing body 20 includes a column fixing portion 22 and a wall fixing portion 23, and a plan view L corresponding to the corner portions of the column member 10 and the wall member 11. A plurality of strip-shaped members 21 formed in a letter shape, and rib plates 28, 28 fixed to the respective strip-shaped members 21 so as to be orthogonal to the column fixing portions 22 and the wall fixing portions 23 in order to reinforce the strip-shaped members 21; , Is composed of.

  As shown in FIG. 5A, the belt-like member 21 is arranged such that the vertical interval P1 between the belt-like members 21 is the member thickness T1 of the column member 10 (see FIG. 5B). Yes.

The column fixing portion 22 of the belt-like member 21 is formed to have the same length as the thickness of the side surface of the column member 10 (the length obtained by subtracting the member thickness T2 of the wall member 11 from the member thickness T1 of the column member 10). In this state, the front end of the column member 10 coincides with the front surface of the column member 10.
The wall fixing portion 23 is a linear portion formed with a length equal to or less than the member thickness T of the column member 10 and is fixed to the wall member 11.

The belt-like member 21 is pressure-bonded to the surfaces of the column member 10 and the wall member 11 by a plurality of anchor members 30, 30,... Arranged at a predetermined interval a1.
Anchor holes are formed in the belt-like member 20 in advance at the same interval as the bar arrangement pitch of the vertical bars R of the column member 10. The pitch of the anchor holes is not limited as long as it is not more than half the thickness of the column member 10 or the wall member 11.

  As shown in FIGS. 5A and 5B, the rib plate 28 is a plate material formed in a trapezoidal shape, and is integrally fixed to the belt-like member 21 while standing on the belt-like member 21.

  The method for fixing the rib plate 28 to the belt-like member 21 is not limited, and may be performed by welding, for example.

  In addition, since the configuration of the reinforcing structure 3 according to the third embodiment is the same as the configuration of the reinforcing structure 1 shown in the first embodiment, detailed description thereof is omitted.

  As mentioned above, according to the reinforcement structure which concerns on 3rd Embodiment, it is comprised only by arrange | positioning the reinforcement body 20 in the corner | angular part of the column member 10 and the wall member 11 at intervals with a predetermined pitch. Therefore, since the construction is easy and the construction can be performed in a short time, it can be suitably employed for a structure in service with time constraints.

  Since the operational effect of the reinforcing structure 3 according to the other third embodiment is the same as that of the reinforcing structure 1 shown in the first embodiment, detailed description thereof is omitted.

The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and it goes without saying that the above-described constituent elements can be appropriately changed in design without departing from the spirit of the present invention.
For example, in each of the above embodiments, the case where the reinforcing structure is configured only on the front side of the column member 10 has been described. However, when the wall member 11 is connected to the middle portion in the front-rear direction of the column member, FIG. As shown in a) and (b), reinforcing members 20 may be provided on the front side and the rear side of the wall member for reinforcement.

It is a perspective view which shows the outline of the reinforcement structure of the columnar member with a wall which concerns on 1st Embodiment. Sectional drawing of the reinforcement structure of the column member with a wall shown in FIG. 1 is shown. (A) is a perspective view which shows the reinforcement body shown in FIG. 1, Comprising: (b) And (c) is a modification of the reinforcement body of (a). It is a figure which shows the outline of the reinforcement structure of the pillar member with a wall which concerns on 2nd Embodiment, (a) is a perspective view, (b) is sectional drawing. It is a figure which shows the outline of the reinforcement structure of the pillar member with a wall concerning 3rd Embodiment, (a) is a perspective view, (b) is sectional drawing. (A) And (b) is sectional drawing which shows the modification of the reinforcement structure of the column member with a wall concerning this invention. (A) And (b) is sectional drawing which shows the reinforcement structure of the conventional column member.

Explanation of symbols

1, 2, 3 Reinforcement structure 10 Column member 11 Wall member 20 Reinforcement body 21 Strip member 22 Column fixing portion 23 Wall fixing portion 28 Rib plate 30 Anchor material R Vertical bar

Claims (1)

A column member having a wall member connected to the side surface;
A reinforcing body disposed in a direction intersecting with the vertical bars of the column member;
A plurality of anchor members for fixing the reinforcing body, and a reinforcing structure for a pillar member with a wall comprising:
The reinforcing body is provided with a plurality of belt-like members arranged at intervals in the vertical direction;
The band-shaped member is fixed to the surface of the column member and the wall member along the corner of the connection portion between the column member and the wall member,
An interval in the vertical direction between the band-shaped members is a size equal to or less than a member thickness of the column member,
The reinforcing body is formed in a lattice shape by combining the plurality of belt-shaped members ,
As the plurality of belt-shaped member, and a pillar fixing portion and the wall fixing part, a first L-shaped strip member formed in plan view L-shape in accordance with the corner between the wall member and the pillar member ,
A second L-shaped band-shaped member formed in an L shape in plan view according to the front and side surfaces of the column member;
A reinforcing structure for a columnar member with a wall, comprising: a straight belt-shaped member that connects the first L-shaped belt-shaped member and the second L-shaped belt-shaped member.

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