JP2014214514A - Earthquake-resistance strengthening structure of wooden house - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an earthquake-resistance strengthening structure of a wooden house, installable even when there is no existing foundation, advantageous even in terms of cost and in terms of a plan in expansion-reconstruction, and also avoiding risk of preceding breaking of an existing part and a joining part to a new construction strength element.SOLUTION: A reinforcement inside column 2 is provided inside a portal existing column-beam framework body 20 constituted of an existing column 21 and an existing beam 22 on both sides in an existing wooden house. When providing a reinforcement corner column 3 along the existing column 21, a strength element 5 is provided between the existing column 21 and the reinforcement inside column 2 when the reinforcement corner column 3 is not provided between this reinforcement corner column 3 and the reinforcement inside column 2. The upper end of the reinforcement inside column 2 is joined to this reinforcement beam 1 when the reinforcement beam 1 is provided along a lower part of the existing beam 22, and is joined to the existing beam 22 when this reinforcement beam 1 is not provided. The lower end of the reinforcement inside column 2 is not joined to both an existing foundation 24 and an existing sill 23 in the existing wooden house.

Description

  The present invention relates to a seismic reinforcement structure for a wooden house.

  Conventionally, as a seismic reinforcement structure for a wooden house, a structure in which a load bearing element such as a load bearing wall or a ramen frame is added to an existing frame is known. As another example, a load-bearing wall for reinforcement is provided, and the column base joint portion of the internal column constituting the load-bearing wall is joined to the foundation as a structure that loads only shearing force without applying a tensile force. Thus, there has been proposed one in which the bearing wall functions as a ramen frame (Patent Document 1).

JP 2012-052358 A

In the conventional seismic reinforcement structure that adds a load bearing element to an existing shaft assembly, it is necessary to fix the load bearing element to the foundation, and therefore there is a limitation that it can only be installed on an existing foundation. Therefore, it may be necessary to eliminate openings such as windows. Moreover, when there is no existing foundation, it is necessary to increase the foundation, and the cost effectiveness is significantly reduced. Furthermore, it is necessary to arrange the load-bearing elements in a well-balanced manner so that the building is not eccentric, and it may be possible that the load-bearing elements required for seismic reinforcement cannot be added only on the existing foundation.
When the load bearing element is a load bearing wall such as a large wall, a true wall, or a brace, a tensile force acts on the column base joint, a tensile force acts on the anchor bolt through the base, and a bending moment acts on the foundation. When the existing foundation is unreinforced concrete, if a strong bearing wall is installed, there is a risk that joints, anchor bolts, foundations, etc. will break ahead of the bearing wall.

  As described above, in the case of a conventional structure that performs seismic reinforcement of a frame such as a column or a beam, a foundation for fixing a base or a column is necessary, and when there is no existing foundation, it is necessary to provide a new one. Even if there is an existing foundation, it is necessary to reinforce it so that it can withstand the pulling force. For these reasons, there were problems in terms of cost and plans for expansion and reconstruction.

  The object of the present invention is that it can be installed even when there is no existing foundation, which is advantageous in terms of cost and plan for extension and renovation, and there is a risk of pre-destructive destruction of existing parts and joints with respect to newly installed strength elements. It is to provide a seismic reinforcement structure for wooden houses to be avoided.

  The seismic reinforcement structure for a wooden house according to the present invention comprises a reinforcing internal column provided inside a portal-shaped existing column / beam shaft assembly composed of an existing column and an existing beam on both sides of an existing wooden house, When a reinforcing corner column is provided along the column, the load bearing element is provided between the reinforcing corner column and the reinforcing internal column. When the reinforcing corner column is not provided, the load bearing element is provided between the existing column and the reinforcing internal column. And the upper end of the reinforcing internal column is joined to the reinforcing beam when the reinforcing beam is provided along the lower side of the existing beam, and is joined to the existing beam when the reinforcing beam is not provided. The lower end of is not joined to either the existing foundation or the existing foundation in the existing wooden house.

  According to this configuration, the lower end of the reinforced internal column is not joined to any of the existing foundation and the existing foundation, and the existing column / beam shaft assembly is converted into a so-called frame-shaped ramen by the reinforced internal column and the load-bearing element. Can be reinforced as a frame. Therefore, even if there is no existing foundation, it can be installed, and there is no need for additional striking of the foundation, which is advantageous in terms of cost and plan for extension and reconstruction. In addition, the risk of a preceding failure of the existing column / beam shaft assembly and joint is avoided with respect to the newly installed load bearing element.

In the present invention, a reinforcing base is provided with one end joined to the lower end of the reinforcing internal column and the other end extending to the existing column side, and the reinforcing base is either an existing foundation or an existing base in the existing wooden house. In addition, the reinforcing base may be joined to the reinforcing corner pillar when the reinforcing corner pillar is provided along the inside of the existing pillar, and to the existing pillar when the reinforcing corner pillar is not provided. good.
In the case of this configuration, the shearing force applied to the reinforced internal column can be transmitted to the reinforced corner column and the existing column via the reinforced foundation, and a further seismic reinforcement effect can be obtained.

  In the present invention, the load bearing element is a face material, and the load bearing element includes the reinforcing internal column and the existing column, which is another shaft member, the reinforcing corner column, the existing beam, the reinforcing beam, and the base. It is good also as what constitutes a bearing wall. When the bearing wall has the face material as a bearing element, the above-mentioned reinforcement of the cane type can be effectively performed.

  The seismic reinforcement structure for a wooden house according to the present invention comprises a reinforcing internal column provided inside a portal-shaped existing column / beam shaft assembly composed of an existing column and an existing beam on both sides of an existing wooden house, When a reinforcing corner column is provided along the column, the load bearing element is provided between the reinforcing corner column and the reinforcing internal column. When the reinforcing corner column is not provided, the load bearing element is provided between the existing column and the reinforcing internal column. And the upper end of the reinforcing internal column is joined to the reinforcing beam when the reinforcing beam is provided along the lower side of the existing beam, and is joined to the existing beam when the reinforcing beam is not provided. The lower end of the non-joint to the existing foundation and the existing foundation in the existing wooden house can be installed even when there is no existing foundation, which is advantageous in terms of cost and plan for expansion and renovation, In addition, the existing parts and joints will be broken ahead of the new strength element. Fear of is avoided.

It is a front view of the earthquake-proof reinforcement structure of the wooden house which concerns on 1st Embodiment of this invention. It is a front view which shows each example of the strength element in the seismic reinforcement structure. It is a front view which shows the detail of each junction part in the seismic reinforcement structure. It is explanatory drawing which shows the frame model of the seismic reinforcement structure. It is a front view of the earthquake-proof reinforcement structure of the wooden house which concerns on other embodiment of this invention. It is a front view of the earthquake-proof reinforcement structure of the wooden house which concerns on further another embodiment of this invention. It is a front view of the earthquake-proof reinforcement structure of the wooden house which concerns on further another embodiment of this invention. It is a front view of the earthquake-proof reinforcement structure of the wooden house which concerns on further another embodiment of this invention. It is a front view of the earthquake-proof reinforcement structure of the wooden house which concerns on further another embodiment of this invention.

  A first embodiment of the present invention will be described with reference to FIGS. The seismic reinforcement structure of the wooden house of this embodiment is constituted by a newly installed reinforcing beam 1, a reinforcing inner column 2, a pair of reinforcing corner columns 3, 3, a reinforcing base 4, and a load bearing element 5, and the existing structure of the frame structure. It is provided inside a portal-shaped existing column / beam shaft assembly 20 composed of the existing columns 21 and 21 and the existing beams 22 on both sides in the wooden house. The lower ends of the existing pillars 21 and 21 on both sides are joined to the existing base 23 provided along the longitudinal direction on the existing foundation 24 made of a cloth foundation. The existing foundation 23 is parallel to the existing beam 22. The new reinforcing beam 1 is a bending reinforcing beam. The reinforcing beam 1, the reinforcing inner column 2, the reinforcing corner column 3, the reinforcing base 4 and the load bearing element 5 are all made of wood, but steel or the like may be used.

  The reinforcing beam 1 is provided between the existing columns 21 and 21 on both sides along the lower side of the existing beam 22. The pair of reinforcing corner columns 3, 3 are provided along the existing columns 21, 21 on both sides, and the upper ends thereof are joined to the reinforcing beam 1 and the lower ends are joined to the existing base 23, respectively. The upper end of the reinforcing corner column 3 is joined to the reinforcing beam 1 via a joining bracket made of a chevron plate 16, for example, as shown in FIG. The trunk portion of the reinforcing corner column 3 is joined to the existing column 21 by a fixing tool including a lag screw 17 as shown in FIGS. 3 (A) and 3 (C), for example. The reinforcing corner column 3 functions as a reinforcing member that transmits the force applied to the reinforcing beam 1 to the existing column 21.

  The reinforcing internal column 2 is disposed inside the existing column / beam shaft assembly 20, and the upper end thereof is joined to the reinforcing beam 1. The upper end of the reinforcing internal column 2 is joined to the reinforcing beam 1 via an L-shaped reinforcing metal 18 as shown in FIG. The lower end of the reinforcing internal pillar 2 is not joined to any of the existing foundation 24 and the existing base 23 in the existing wooden house. That is, the lower end of the reinforcing internal pillar 2 is joined to one end of the reinforcing base 4 that is not joined to either the existing foundation 24 or the existing base 23. The other end of the reinforcing base 4 extends toward the one existing column 21 and is joined to one reinforcing corner column 3 provided along the existing column 21. The lower end of the reinforcing internal column 2 is joined to the reinforcing base 4 via a joint metal made of a chevron plate 16, for example, as shown in FIG. For example, as shown in FIG. 3C, the other end of the reinforcing base 4 is joined to the reinforcing corner column 3 via a joint metal made of a chevron plate 16.

  The strength element 5 is provided between the one reinforcing corner column 3 and the reinforcing inner column 2. The load-bearing wall 15 is formed by the load-bearing element 5, the reinforcing inner column 2, and the existing column 21, the reinforcing corner column 3, the existing beam 21, the reinforcing beam 1, and the reinforcing base 4, which are other shaft members. Composed. The proof stress element 5 consists of a face material or a brace. Each example of the load bearing element 5 is shown in FIGS.

  FIG. 2A shows an example of a large wall bearing wall 15A. In this example, a load bearing element 5A made of a face material is provided so that the reinforcing corner column 3 and the reinforcing inner column 2 are hidden together. With this strength element 5A, the reinforcing inner column 2, and the existing column 21, the reinforcing corner column 3, the existing beam 21, the reinforcing beam 1, and the reinforcing base 4 which are other shaft members, a large wall strength A wall 15A is formed. The upper and lower sides of the load bearing element 5 </ b> A made of the face material are joined to the receiving members 6 </ b> A and 6 </ b> B provided between the reinforcing corner column 3 and the reinforcing inner column 2 along the reinforcing beam 1 and the reinforcing base 4.

  FIG. 2B shows an example of a true wall bearing wall 15B. In this example, a load bearing element 5B made of a face material is provided so that the reinforcing corner pillar 3 and the reinforcing inner pillar 2 are both exposed. The load-bearing element 5B, the reinforcing internal pillar 2, and the other shaft member constitute a true wall bearing wall 15B. Also in this case, the upper and lower sides of the load bearing element 5B made of the face material are respectively provided on the receiving members 6A and 6B provided between the reinforcing corner column 3 and the reinforcing inner column 2 along the reinforcing beam 1 and the reinforcing base 4, respectively. Be joined.

FIG. 2 (C) shows an example in which a load bearing element 5C composed of one muscle crossing is provided. The load bearing wall 15C is configured by the load bearing element 5C, the reinforcing internal pillar 2, and the other shaft member.
FIG. 2 (D) shows an example in which a load bearing element 5D composed of straddling braces is provided. The load-bearing wall 15D is configured by the load-bearing element 5D, the reinforcing internal pillar 2, and the other shaft member.

  According to the seismic reinforcement structure having the above-described structure, the lower end of the reinforcing internal column 2 is not joined to the existing base 23 and the existing foundation 24. Therefore, when the portion of the bearing wall 15 is replaced with braces, a cane type ramen as shown in FIG. It can be framed as a frame. In other words, the seismic reinforcement structure of this wooden house can constitute a ramen frame as shown in the figure, and the tensile force acting on the column base is reduced compared to the case where a bearing wall with four sides joined to the shaft member is provided. can do. In a wooden house, large-wall bearing walls and true-wall bearing walls are generally modeled by replacing braces when modeling and structural analysis.

As a specific example, for example, instead of the bearing wall 15 in the seismic reinforcement structure having the above-described configuration, a case where a bearing wall in which the lower end of the reinforcing internal column 2 in the bearing wall 15 is joined to the existing base 23 or the existing foundation 24 is provided. Consider the following moment balance formula.
PH = TL (1)
However, P: Seismic force H: Height of the existing column / beam shaft assembly 20 T: Tensile force acting on the column base of the existing column 21 L: Span At this time, H = 2730 mm, the width dimension of the bearing wall = 910 mm In this case, T = 3P. That is, in this case, the span L in the expression (1) is the width dimension of the bearing wall.

On the other hand, in the seismic reinforcement structure of this embodiment that constitutes a cane type ramen frame as shown in FIG. 4, assuming that H = 2730 mm and the span between both existing columns 21 and 21 = 3640 mm,
T = 0.75P.
That is, in this case, the span L in the formula (1) is a span between the two existing columns 21 and 21. As a result, the span L in the equation (1) can be expanded and the column base is affected more in the case where the earthquake-proof reinforcement is performed with the earthquake-resistant reinforcement structure that constitutes the cane type ramen frame as in this embodiment. It can be seen that the tensile force T can be reduced.
Therefore, according to this embodiment, with respect to the newly installed strength element 5 (5A to 5D), the risk of preceding destruction of existing parts and joints is avoided.

  Moreover, in this seismic reinforcement structure of a wooden house, since the lower end of the reinforced internal pillar 2 provided with the load bearing element 5 is not joined to the existing base 23 and the existing foundation 24, a cane-shaped ramen frame is formed. Even if the existing foundation 24 is not provided inside the column / beam shaft assembly 20, seismic reinforcement can be performed. For this reason, it can be applied without being restricted by the existing foundation 24, and there is no need for additional striking of the foundation, which is advantageous in terms of cost and plan for extension and renovation. In other words, the seismic reinforcement can be performed by the seismic reinforcement structure that can be easily configured on site. In addition, since a large bending moment acts on the existing beam 22 in the cane type ramen frame, the reinforcement of the existing beam 22 is achieved by providing the reinforcing beam 1 along the existing beam 22 as in this embodiment. Can do.

  Further, since the lower end of the reinforcing internal column 2 is not joined to the existing base 23 and the existing foundation 24, the counterweight borne by the reinforcing corner column 3 is increased, and the effect of reducing the tensile force acting on the column base is increased. To do.

  Furthermore, in this embodiment, since the reinforcing beam 1 is provided along the lower side of the existing beam 22, an effect of reducing the deflection of the upper floor is also obtained. However, if the existing beam 22 has sufficient bending rigidity and proof strength, a sufficient seismic reinforcement effect can be obtained without providing the reinforcing beam 1.

  Moreover, in this embodiment, since the reinforcement base 4 which one end is joined to the lower end of the reinforcement internal pillar 2 and the other end extends to the existing pillar 21 side is provided, the shear force applied to the reinforcement internal pillar 2 is applied to the reinforcement corner pillar. 3 can be transmitted, and a further seismic reinforcement effect can be obtained.

  FIG. 5 shows another embodiment of the present invention. In the seismic reinforcement structure for a wooden house, in the embodiment shown in FIGS. 1 to 4, the reinforcing beam 1 along the existing beam 21 and the reinforcing corner columns 3 and 3 on both sides along the existing columns 21 and 21 are omitted. ing. That is, the upper end of the reinforcing internal column 2 is joined to the existing beam 22, and the other end of the reinforcing base 4 is joined to the existing column 21. Other configurations are the same as those of the embodiment shown in FIGS.

  When the existing beam 22 and the existing column 21 have sufficient rigidity and strength, even if the reinforcing beam 1 and the reinforcing corner columns 3 and 3 are omitted in this way, a sufficient seismic reinforcing effect can be obtained. Other effects are the same as in the previous embodiment.

  FIG. 6 shows still another embodiment of the present invention. In the vibration-proof reinforcement structure for a wooden house, in the embodiment shown in FIGS. 1 to 4, the existing pillar / beam shaft assembly 20 is provided across two existing foundations 24 and 24 extending in parallel to each other. Yes. That is, the seismic reinforcement structure of this example is provided across the section where the existing foundation 24 and the existing base 23 are not installed. Other configurations and operational effects are substantially the same as those of the embodiment shown in FIGS.

  FIG. 7 shows still another embodiment of the present invention. In the vibration-proof reinforcement structure of the wooden house, in the embodiment shown in FIG. 6, the reinforcing beam 1 along the existing beam 22 and the reinforcing corner columns 3 and 3 on both sides along the existing columns 21 and 21 are omitted. Other configurations are the same as those of the embodiment shown in FIG.

  When the existing beam 22 and the existing column 21 have sufficient rigidity and strength, even if the reinforcing beam 1 and the reinforcing corner columns 3 and 3 are omitted in this way, a sufficient seismic reinforcing effect can be obtained. Other effects are the same as those of the embodiment of FIG.

  FIG. 8 shows still another embodiment of the present invention. In the seismic reinforcement structure for a wooden house, in the embodiment shown in FIG. 6, a new reinforcing truss 7 is provided between the existing beam 22 and the reinforcing beam 1 provided below the existing beam 22. Yes. Other configurations are the same as those of the embodiment shown in FIG.

  Thus, by providing the truss 7 between the existing beam 22 and the reinforcing beam 1, the existing beam 22 can be bent and reinforced more strongly, and the seismic reinforcement effect can be increased. Other effects are the same as those of the embodiment of FIG.

  FIG. 9 shows still another embodiment of the present invention. In the embodiment shown in FIG. 6, the seismic reinforcement structure for a wooden house includes the load bearing element 15, the reinforcing inner pillar 2, and the bearing wall 15 configured with other shaft members only on the one existing pillar 21 side. It is also provided on the other existing pillar 21 side, and the other configuration is the same as that of the embodiment of FIG.

  Thus, when the load-bearing wall 15 comprised with the load-bearing element 5, the reinforcement internal pillar 2, and another shaft member is provided in the both sides inside the existing pillar-beam shaft assembly 20, the existing beam 22 is provided. The bending moment (deflection) applied to can be reduced, and the seismic reinforcement effect can be further enhanced. Other effects are the same as those of the embodiment of FIG.

Next, the configurations and the characteristics of the effects according to the above embodiments are summarized and shown below.
[Configuration features]
-Reinforcing the existing column / beam shaft assembly 20 with the internal column 2 serving as a ramen frame 2, the load-bearing element 5, and the joint type, etc., improves the structural strength and provides an earthquake-proof reinforcement effect.
・ The ramen frame is not a rigid joint, but is a cane type that can be easily constructed on site.
-Do not fix the column base of the reinforced internal column 2 to the existing base so that it becomes a cane type.
In the case of a true wall bearing wall and a large wall bearing wall, it is preferable to provide a reinforcing base 4 for transmitting a shearing force acting on the reinforcing internal column 2 to the existing column 21.
-Since a large bending moment acts on the existing beam 22 in a cane type | mold, it is preferable to provide the reinforcement beam 1 for bending reinforcement as needed.
When the reinforcing beam 1 for bending reinforcement is provided, the corner post 3 is reinforced as necessary in order to transmit the force of the reinforcing beam 1 to the existing column 21.
The strength element 5 can be applied to both sides of the existing column / beam shaft assembly 20 to reduce the bending moment and bending of the beam.

[Functional features]
-By setting the reinforcing internal column 2 to which the load bearing element 5 (5A to 5D) is attached to the existing base, a foundation on which the existing base is bonded becomes unnecessary.
-By setting the reinforced internal column 2 to which the load bearing element 5 (5A to 5D) is attached to the existing base, a ramen frame can be constructed, and it acts on the column base due to the span effect of the ramen frame compared to the load bearing wall. The tensile force to be reduced can be reduced.
-By adopting a structure in which the reinforced internal column 2 to which the load bearing element 5 (5A to 5D) is attached is not joined to the existing base, the counterweight borne by the reinforced corner column 3 is increased, and the tensile force acting on the column base is reduced. To increase the effect.
・ Because the structure does not require a foundation, it is not subject to placement restrictions due to existing foundations.
-The effect of reducing the bending of the upper floor can be obtained by bending and reinforcing the existing beam (reinforcement beam 1).
-The beam (reinforcing beam 1) that bends and reinforces the existing beam can be composed of not only general beams but also trusses and overlapping beams.
If the existing beam 22 has sufficient bending rigidity and strength, the seismic reinforcement effect can be obtained without the reinforcing beam 1 for bending reinforcement.
-As the load-bearing element 5, all of large walls, true walls, and braces can be applied. In this case, the shearing force can be transmitted to the reinforcing corner column 3 by providing the reinforcing base 4.

DESCRIPTION OF SYMBOLS 1 ... Reinforcement beam 2 ... Reinforcement inner pillar 3 ... Reinforcement corner pillar 4 ... Reinforcement base 5,5A, 5B, 5C, 5D ... Strength bearing element 15, 15A, 15B, 15C, 15D ... Bearing wall 20 ... Existing pillar and beam shaft Body 21 ... Existing pillar 22 ... Existing beam 23 ... Existing foundation 24 ... Existing foundation

Claims (3)

When a reinforced internal column is provided inside a portal-shaped existing column / beam shaft assembly composed of existing columns and beams on both sides in an existing wooden house, and a reinforced corner column is provided along the existing column Is provided between the reinforced corner column and the reinforced internal column, if the reinforced corner column is not provided, a strength element is provided between the existing column and the reinforced internal column,
The upper end of the reinforcing internal column is joined to the reinforcing beam when the reinforcing beam is provided along the lower side of the existing beam, and to the existing beam when the reinforcing beam is not provided,
The lower end of the reinforced internal column is not joined to any of the existing foundation and existing foundation in the existing wooden house,
Seismic reinforcement structure for wooden houses. The seismic reinforcement structure for a wooden house according to claim 1, wherein a reinforcing base is provided with one end joined to the lower end of the reinforcing internal column and the other end extending toward the existing column.
In the case where the reinforcing foundation is not joined to any of the existing foundation and the existing foundation in the existing wooden house, and the reinforcing foundation is provided with a reinforcing corner column along the inside of the existing column, the reinforcing corner is provided. When this reinforcing corner column is not provided on the column, it is joined to the existing column,
Seismic reinforcement structure for wooden houses.   3. The seismic reinforcement structure for a wooden house according to claim 1, wherein the load-bearing element is a face material, and the load-bearing element is the reinforcing internal column, the existing column that is another shaft member, and the reinforcement. A seismic reinforcement structure for a wooden house that forms a bearing wall together with a corner pillar, the existing beam, the reinforcing beam, and the base.

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