JP6449115B2 - Seismic structure and earthquake resistance method - Google Patents

Description

  The present invention relates to an earthquake resistant structure and an earthquake resistant method.

  Currently, there are many seismic isolation repairs to install seismic isolation devices such as laminated rubber in existing buildings. In the seismic isolation renovation work, in order to install the seismic isolation device, the ground below the existing building may be excavated or the supporting piles may be cut, but in that case it is necessary to take measures against the earthquake of the existing building .

  As a countermeasure against such an earthquake, a temporary earthquake-resistant wall 111 as shown in FIG. 7 may be provided before installing the seismic isolation device. In the example of FIG. 7, the mat slab 109 is constructed on the ground 101 that has been dug below the floor slab 103 and the foundation beam 105 of the existing building, and the earthquake resistant wall 111 is provided on the mat slab 109.

  A slit 112 is formed between the earthquake resistant wall 111 and the foundation beam 105, and the plate 113 is disposed so as to straddle the slit 112. The plate 113 is attached to each of the earthquake resistant wall 111 and the foundation beam 105. The plate 113 is attached by passing a bolt 113b through the elongated hole 113a in the vertical direction and screwing the bolt 113b to a nut (not shown) provided on the earthquake resistant wall 111 or the foundation beam 105.

  The slit 112 prevents the earthquake resistant wall 111 from bearing the vertical load of the existing building. Until the seismic isolation device is installed, the existing building is supported by a jack (not shown). However, because of the slit 112, the vertical load of the existing building will be affected by the seismic wall even when jacking down after the seismic isolation device is installed. It does not join 111, and the earthquake-resistant wall 111 does not crack.

  As an example of other seismic isolation work, Patent Document 1 discloses that a specific lower floor pillar is removed and a bearing device is installed instead, and the concrete on the side wall is crushed into a slit shape. It is described that a vertical bar is exposed and the lower end thereof is cut, and the lower end of the vertical bar is inserted into a steel pipe provided on the lower surface of the slit so as to function as a damper against horizontal vibration.

Japanese Patent Laid-Open No. 9-235889

  The seismic wall 111 shown in FIG. 7 takes time and labor for mounting the plate 113 using bolts 113b and the like. In addition, in order to deal with vibrations in two directions orthogonal to each other on a plane, it is necessary to install a seismic wall in each of the two directions, which causes the construction period to be extended. There is also a problem that the cost of the plate 113, the bolt 113b, etc. is increased and the construction cost is increased.

  In addition, in the method of Patent Document 1, the vertical load applied to the column is temporarily transferred to the wall. There was also.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide an earthquake-resistant structure that can be easily constructed and can shorten the construction period and the construction cost.

  According to a first aspect of the present invention for achieving the above object, a wall is provided between the upper structure and the lower structure, and a separation portion is provided between the wall and the upper structure or the lower structure. However, one end of the steel material is embedded in the wall body, and the other end is disposed through the separation portion so as to be embedded in the upper structure or the lower structure, and the steel material is inclined with respect to the vertical direction. It is an earthquake resistant structure characterized by

  According to a second aspect of the present invention, a wall body is provided between the upper structure and the lower structure, a separation portion is provided at a position where the wall body is vertically divided, and the steel material has one end of the steel material at the upper wall body. The seismic structure is characterized in that it is embedded and disposed through the separation portion so that the other end is embedded in the lower wall body, and the steel material is disposed inclined with respect to the vertical direction. .

  When the plane is viewed, it is desirable that the steel material is disposed to be inclined with respect to the longitudinal direction of the wall body. It is also desirable that the plurality of steel materials are arranged so as to intersect when viewed from the plane. Furthermore, it is also desirable that the plurality of steel materials are arranged so as to intersect when the side surface is viewed.

  3rd invention has the process (a) which provides a wall body between an upper structure and a lower structure, In the said process (a), it separates between the said wall body and the said upper structure, or the said lower structure. The steel material is disposed through the separation portion such that one end of the steel material is embedded in the wall body and the other end is embedded in the upper structure or the lower structure. It is an earthquake-proofing method characterized by being arranged inclining with respect to a direction.

  4th invention has the process (a) which provides a wall body between an upper structure and a lower structure, and in the above-mentioned process (a), a separation part is provided in a position which divides the wall body up and down, A steel material is disposed through the separation portion such that one end of the steel material is embedded in the upper wall body and the other end is embedded in the lower wall body, and the steel material is inclined with respect to the vertical direction. It is a seismic improvement method characterized by being arranged.

  After the earthquake-proofing of the existing building by the step (a), the method further includes a step (b) of installing a seismic isolation device, supporting the existing building by the seismic isolation device, and removing the wall body. desirable.

  In the present invention, a separation portion is provided between the wall body and the upper structure or the lower structure, or at a position where the wall body is vertically divided, and an oblique direction inclined with respect to the vertical direction through the separation portion is provided. Steel is provided. The seismic structure of the present invention can be easily constructed without the need for fixing bolts, leading to a shortened construction period, and the costs for plates, bolts, etc. can be reduced and the construction costs can be reduced. In addition, steel materials in an oblique direction convert compressive stress into partial bending and do not transmit vertical loads directly in the vertical direction. It can be suitably secured.

  In addition, by inclining the steel material with respect to the longitudinal direction of the wall body even on a plane, an effect can be expected in both the longitudinal direction and the direction orthogonal to the plane with one wall body. Therefore, it is not necessary to install a seismic wall along each direction, and the construction period can be further shortened and the construction cost can be reduced. Further, by arranging a plurality of steel materials so as to intersect each other on the plane and side surfaces, an earthquake-resistant structure can be constructed in a space-saving manner, and the construction period can be shortened and the construction cost can be reduced as described above.

  In addition, in the seismic isolation renovation work, the above-mentioned seismic structure is formed as a seismic countermeasure for existing buildings before the seismic isolation equipment is installed, and the wall body etc. is removed after the seismic isolation equipment is installed, so that the present invention is under seismic isolation repair work. It can be applied as an earthquake countermeasure with temporary walls.

  According to the present invention, it is possible to provide an earthquake-resistant structure that can be easily constructed and can shorten the construction period and reduce the construction cost.

The figure explaining the earthquake resistance method of this embodiment The figure explaining the earthquake resistance method of this embodiment The figure explaining the earthquake resistance method of this embodiment The figure which shows arrangement | positioning of the steel material 13 The figure which shows the earthquake-resistant walls 23a and 23b The figure which shows arrangement | positioning of the steel material 13 The figure which shows the temporary seismic wall 111

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  1-3 is a figure explaining the earthquake-proofing method which concerns on embodiment of this invention. In the present embodiment, an example will be described in which seismic countermeasures for an existing building are performed using a temporary seismic wall until the seismic isolation device is installed in the seismic isolation repair work in which the seismic isolation device is installed in the existing building.

  That is, in this embodiment, as the seismic isolation repair work for the existing building, first, the floor slab 3 and the ground 1 below the foundation beam 5 shown in FIG. 1 (a) are excavated, as shown in FIG. 1 (b). A work space 6 is formed below the existing building. This space functions as a seismic isolation layer by installing a seismic isolation device to be described later. Reference numeral 7 in FIG. 1B denotes a support pile of an existing building, and the foundation beam 5 is provided along each of two directions (X direction and Y direction) orthogonal to each other on a plane.

  Then, as shown in FIG.1 (c), the support pile 7 is cut | disconnected and removed, and the jack 8 is arrange | positioned instead and the vertical load of the existing building is supported. Further, a mat slab 11 is constructed on the ground 1, and at this time, a plurality of oblique stripes 13 are arranged at positions corresponding to a later-described earthquake resistant wall of the mat slab 11. The oblique line 13 is provided so that one end is embedded in the mat slab 11 and the other end protrudes above the mat slab 11. A steel material such as a reinforcing bar is used as the oblique line 13.

  Then, as shown in FIG. 2 (a), a formwork 17 for forming a seismic wall and a reinforcing beam to be described later is installed below the foundation beam 5, and post-construction is performed at a position corresponding to the reinforcement beam of the foundation beam 5. Anchor 21 is driven. In addition, a beam stand is provided with a pipe or the like (not shown) and beam reinforcement (not shown) of the reinforcing beam is performed in advance. Sand 15 is spread between the mat slab 11 and the formwork 17. The thickness of the sand 15 is determined according to the width of the slit described later, and is, for example, about 60 to 100 mm, but is not limited thereto.

  Concrete is slowly placed in the mold 17 so that the sand 15 does not move, and after the strength of the concrete is developed, the sand 15 is removed by blowing off with air or the like, and the mold 17 is removed. Thereby, as shown in FIG.2 (b), the reinforcement beam 25 and the earthquake-resistant wall 23 are formed, the earthquake-resistant structure 20 is constructed | assembled, and earthquake resistance of the existing building is performed.

  The reinforcing beam 25 (upper structure) is a reinforcing beam member provided along the longitudinal direction of the foundation beam 5 below the foundation beam 5. The earthquake resistant wall 23 is a wall for earthquake countermeasures provided below the reinforcing beam 25 along the longitudinal direction of the reinforcing beam 25 (longitudinal direction of the foundation beam 5). A horizontal slit 24 is provided as a separation portion between the earthquake resistant wall 23 and the mat slab 11 (lower structure). The oblique stripes 13 are arranged through the slits 24, and both ends are embedded in the mat slab 11 and the earthquake resistant wall 23, respectively.

  FIG. 4 is a diagram simply showing the arrangement of the oblique stripes 13 and shows a perspective view, a plan view, and a side view of the arrangement range of the oblique stripes 13.

  As shown in FIG. 4, in the present embodiment, the oblique stripes 13 are arranged so as to be inclined three-dimensionally. That is, when the plane is viewed, each oblique line 13 is arranged to be inclined with respect to the longitudinal direction (left and right direction in the figure) of the seismic wall 23, and when viewed from the side, each oblique line 13 is in the vertical direction. It is inclined with respect to.

  In the present embodiment, a plurality of oblique lines 13 are arranged to intersect each other. That is, when the plane is viewed, a plurality of (two in the illustrated example) diagonal stripes 13 are arranged so as to intersect in an X shape. It is arranged to intersect in a letter shape.

  Return to explanation of seismic isolation repair work. In this embodiment, after construction of the seismic structure 20, as shown in FIG. 2C, the laminated rubber 9 (the seismic isolation device) and the capital part 10 are placed between the mat slab 11 and the foundation beam 5 at the position of the support pile 7. Provide.

  Thereafter, when the jackdown is performed, the vertical load of the existing building is supported by the laminated rubber 9 through the capital portion 10, so that the jack 8 is removed and the remaining reinforcement beam 25 is removed as shown in FIG. Forming part. The width of the slit 24 is determined so that the earthquake-resistant wall 23 does not contact the mat slab 11 when jacking down.

  Finally, as shown in FIG. 3B, the seismic wall 23 and the oblique stripe 13 are removed. At this time, the boundary between the reinforcing beam 25 and the earthquake-resistant wall 23 is cut with a wire saw or the like, and the oblique line 13 is cut at the position of the slit 24 by gas cutting or the like.

  Thus, in the present embodiment, the slit 24 is provided between the earthquake-resistant wall 23 and the mat slab 11, and the oblique line 13 is provided so as to pass through the slit 24. The seismic structure 20 of the present embodiment can be easily constructed without the need for fixing bolts, leading to a shortened construction period, reducing the cost of steel materials such as plates, bolts, etc., and reducing the construction cost. The oblique muscle 13 converts the compressive stress into a partial bend and does not directly transmit the vertical load in the vertical direction. Therefore, it is easy to design and construct without transmitting stress that is not originally assumed to each member. The building's safety can be suitably ensured by exhibiting an earthquake resistance effect against shaking.

  Further, in the present embodiment, the oblique stripes 13 are inclined with respect to the longitudinal direction of the earthquake-resistant wall 23 even in a plane, and have a three-dimensional inclination, so that one earthquake-resistant wall 23 is used in the longitudinal direction of the earthquake-resistant wall 23. And the effect can be expected in both directions (X direction, Y direction) perpendicular to the plane. Therefore, it is not necessary to install seismic walls along each of the X and Y directions, and the construction period can be further reduced and the construction cost can be reduced. In addition, by arranging a plurality of oblique stripes 13 so as to intersect each other on a plane or a side surface, the earthquake-resistant structure 20 can be constructed in a space-saving manner, and the construction period and the construction cost can be reduced in the same manner as described above.

  In this embodiment, the reinforcing beam 25 is provided as part of the seismic isolation repair work, and the construction period can be shortened by constructing the earthquake-resistant wall 23 integrally with the reinforcing beam 25. However, the reinforcing beam 25 can be omitted, and the upper structure of the earthquake resistant wall 23 is not limited to the reinforcing beam 25, and the lower structure is not limited to the mat slab 11. What is the upper structure or the lower structure of the earthquake-resistant wall 25 depends on the structure of the building, the purpose and method of the seismic isolation repair work. Further, the seismic isolation device is not limited to the laminated rubber 9, and for example, a sliding bearing can be used.

  In the present embodiment, the seismic structure 20 is formed as an earthquake countermeasure for the existing building before the installation of the laminated rubber 9 in the seismic isolation work, and the earthquake resistant wall 23 and the like are removed after the installation of the laminated rubber 9, thereby removing the earthquake resistant structure 20. Can be applied as an earthquake countermeasure by the temporary seismic wall 23 during the seismic isolation repair work.

  However, in some cases, it is possible to leave the earthquake-resistant wall 23 as the permanent earthquake-resistant structure 20 without removing it. Moreover, the earthquake-resistant structure 20 is constructed at the time of new construction of a building and can be applied as an earthquake-resistant structure of a new building.

  In addition, although the slit 24 is provided between the mat slab 11 and the earthquake-resistant wall 23 in the present embodiment, the earthquake-resistant wall 23a is provided on the mat slab 11 as shown in the earthquake-resistant structure 20a in FIG. A slit 24 may be formed between the beam 25 and the earthquake resistant wall 23a. The oblique line 13 is disposed through the slit 24, and both ends thereof are embedded in the reinforcing beam 25 and the earthquake-resistant wall 23a, respectively.

  Moreover, as shown in the earthquake-resistant structure 20b of FIG.5 (b), you may provide the slit 24 in the position which divides | segments the earthquake-resistant wall 23b up and down. The lower earthquake-resistant wall 23 b is provided on the mat slab 11, and the upper earthquake-resistant wall 23 b is provided below the reinforcing beam 25. The oblique line 13 is arranged through the slit 24 as described above, and both end portions thereof are embedded in the upper and lower earthquake-resistant walls 23b.

  In addition, the arrangement of the oblique stripes 13 is not limited to that described in the present embodiment. For example, FIGS. 6A to 6C are other examples of the arrangement of the oblique stripes 13, and the arrangement of the oblique stripes 13 is shown in the same perspective view, plan view, and side view as FIG.

  For example, in the example of FIG. 6A, when the plane is viewed, two oblique lines 13 are arranged so as to intersect in an X shape as in FIG. When viewed, they are arranged side by side in a substantially straight line without intersecting. In the example of FIG. 6B, when the plane and the side are viewed, three or more (four in the illustrated example) oblique stripes 13 are arranged to intersect. In the example of FIG. 6C, when the side is viewed, two oblique lines 13 are arranged so as to intersect in an X shape, but these oblique lines 13 intersect when viewed from the plane. Instead, they are arranged in a substantially C shape.

  Such an arrangement of the oblique stripes 13 can provide substantially the same effect as the arrangement example of FIG. How to arrange the oblique lines 13 can be determined as appropriate in consideration of the seismic effect, workability, construction cost, and the like.

  As mentioned above, although embodiment of this invention was described referring an accompanying drawing, the technical scope of this invention is not influenced by embodiment mentioned above. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

1, 101; Ground 3, 103; Floor slab 5, 105; Foundation beam 7; Support pile 8; Jack 9; Laminated rubber 10; Capital part 11, 109; 20a, 20b; Seismic structure 21; Post-installed anchors 23, 23a, 23b, 111; Seismic walls 24, 112; Slit 25; Reinforcement beam 113; Plate 113a;

Claims (8)

A wall is provided between the upper structure and the lower structure,
A separation portion is provided between the wall body and the upper structure or the lower structure,
Steel material is disposed through the separation portion such that one end of the steel material is embedded in the wall body and the other end is embedded in the upper structure or the lower structure,
An earthquake-resistant structure, wherein the steel material is disposed to be inclined with respect to the vertical direction. A wall is provided between the upper structure and the lower structure,
A separation portion is provided at a position where the wall body is vertically divided,
Steel material is disposed through the separation portion such that one end of the steel material is embedded in the upper wall body and the other end is embedded in the lower wall body,
An earthquake-resistant structure, wherein the steel material is disposed to be inclined with respect to the vertical direction.   The earthquake-resistant structure according to claim 1 or 2, wherein the steel material is disposed so as to be inclined with respect to a longitudinal direction of the wall body when viewed from a plane.   The earthquake-resistant structure according to any one of claims 1 to 3, wherein the steel materials are arranged so as to intersect when the plane is viewed.   The earthquake-resistant structure according to any one of claims 1 to 4, wherein when viewed from the side, the plurality of steel materials are arranged so as to intersect with each other. A step (a) of providing a wall between the upper structure and the lower structure;
In the step (a),
A separation portion is provided between the wall body and the upper structure or the lower structure,
Steel material is disposed through the separation portion such that one end of the steel material is embedded in the wall body and the other end is embedded in the upper structure or the lower structure,
The steel material is arranged to be inclined with respect to the vertical direction. A step (a) of providing a wall between the upper structure and the lower structure;
In the step (a),
A separation portion is provided at a position where the wall body is vertically divided,
Steel material is disposed through the separation portion such that one end of the steel material is embedded in the upper wall body and the other end is embedded in the lower wall body,
The steel material is arranged to be inclined with respect to the vertical direction.   The method further includes the step (b) of installing the seismic isolation device after supporting the existing building by the step (a), supporting the existing building by the seismic isolation device, and removing the wall body. The earthquake resistance method according to claim 6 or 7, wherein the method is earthquake resistant.

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