JP4968972B2 - Exterior wall construction method and exterior wall structure using horizontal slit material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of constructing an exterior wall having horizontal slit members for earthquake resistance inside a joint part which is formed between a beam and a horizontal joint portion at the bottom end of a non-structural wall in a reinforced concrete building, and also provide an exterior wall structure. <P>SOLUTION: A supporter 20 includes a connection part 22 fitted to a joint bar affixed to the inner surface of a vertical form to form the joint part 9 and a holding part 21 provided to the rear surface side thereof. The first horizontal slit member 7 disposed on the beam 4 side of the lower story is held by the holding part 21 utilizing adhesiveness. In this state, the concrete 4 of the lower story is placed so as to match the upper surface of the first horizontal slit member 7. After the concrete 4 of the lower story is hardened, the second horizontal slit member 8 is disposed on the upper surface of the first horizontal slit member 7, and a concrete which forms the non-structural wall 1 of the upper story is placed. After the concrete 1 is hardened, the vertical form and the joint bar are removed, a backup member 12 is pushed into the connection part 22 of the supporter 20, and a caulking material 13 is charged thereinto. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a method for constructing an outer wall using a horizontal slit material embedded in a joint portion between a lower floor beam portion and an upper floor non-structural wall, which are part of the outer wall of a concrete building, and its The present invention relates to an outer wall structure constructed by the method.

  In recent years, in concrete buildings such as buildings, a method of using a buffer material called a slit material for the purpose of forming a structural slit that becomes a mechanical discontinuity with respect to interlayer displacement at the boundary part such as a column or wall Is spreading. Since this slit material is embedded so as to penetrate the wall or leave a predetermined wall thickness, and the building is divided through the slit material, the shear stress generated in the building when subjected to an external force due to an earthquake By absorbing and relaxing the material with a slit material and blocking its transmission, the building is prevented from shearing and brittle.

  This type of seismic slit material includes a vertical slit material embedded near the boundary between the waist wall or hanging wall of a reinforced concrete building and a column connected to this, as well as the upper floor of the building. There is a horizontal slit material provided between the wall (non-structural wall) and the beam on the lower floor. And as a prior art example using this horizontal slit material, there exists a thing of patent documents 1, for example. Here, a pair of slit members formed in a rectangular cross section are arranged such that rainwater from the outside is present at the boundary between the upper end of the lower floor beam and the lower end of the upper wall of the upper floor that constitute a part of the outer wall. In consideration of intrusion, the outdoor side is used in a state of being arranged in a stepped manner so that the corners of each other face each other so that the outdoor side is lower than the indoor side.

  In the above conventional example, first, a joint rod is nailed horizontally at a predetermined position on the inner surface of the outer mold frame (vertical mold frame), and then the slit material on the lower floor side along the opposite side surface of the joint rod with a headless nail or the like. In this state, concrete is cast up to the upper surface of these, and the lower-level frame is constructed. Next, the upper floor side slit material is placed on the lower floor flooring concrete surface so that the corners of the lower floor floor side abut each other, and concrete is placed on the upper part thereof. The outer wall of the upper floor is constructed. By adopting such a configuration, in the construction of the outer wall of the upper floor, it becomes possible to secure a wide space between the side surface of the upper slit material and the outer mold, and as a result, the filling property of concrete is improved, Cracks at the lower end of the outer wall of the upper floor, which has been a problem until now, are less likely to occur.

Utility Model Registration No. 3056727

  By the way, in order to fix the slit material on the lower floor side to the joint rod, the headless nail is driven from the back side of the slit material so as to reach the outer mold frame through the joint rod while being applied to the joint rod. It is customary. Thereby, when the outer mold is removed, the headless nail is pulled out of the slit material together with the outer mold frame and the joint rod, and only the slit material is left. Since the concrete is cast with the slit material projecting greatly inside the outer mold, the slit material extends along the longitudinal direction so as not to be lifted or displaced due to the pressure of the placed concrete. It is necessary to nail several places. However, since the slit material is only attached to the concrete surface that has been laid, if there are many nailing points, it is dragged by the headless nail when the outer mold is removed, and is pulled out together. In addition, there is still room for improvement in terms of attaching the slit material.

  The present invention has been made in view of the problems of the prior art, and in placing concrete, a construction method for constructing an outer wall by reliably installing a horizontal slit material for earthquake resistance at a predetermined position, and this method. The purpose is to provide an outer wall structure to be constructed.

  In order to solve the above problems, the outer wall construction method using the horizontal slit material according to the present invention is such that the joint rod and the first slit material are elongated between the predetermined positions on the inner surface of the vertical frame. The first slit member is held in a straight line by a support tool interposed in the direction and fixed in a horizontal state on the joint rod side, and concrete is placed up to the upper surface position of the first slit member, and the outer wall of the lower floor After the construction, the second slit material is placed along the first slit material, and the outer wall of the upper floor is constructed by placing concrete on the top, and then the vertical formwork and joint rod are removed It is characterized by this.

  According to such a configuration, the first slit material (horizontal slit material) held on the support by appropriate means such as adhesive is supported on the other end surface side of the joint rod fixed to the inner surface of the vertical formwork. Since it is attached via a tool, it is securely fixed to the joint rod, and does not rise or shift due to the concrete pouring pressure, and its mounting work is easy. Further, when the mold is removed, the first slit member is reliably left on the concrete side together with the support. Furthermore, when a slit material made of a material that is easily deformed, such as a foam material, is fixed to the joint rod with a nail as it is, the unfixed non-fixed portion is pushed upward by the concrete and curved upward, and is linear. However, according to the present invention, since the first slit member is held by the holding portion of the support member over its entire length, the first slit member is not deformed by the concrete placing pressure, and is straight. Can be installed. Therefore, the slit width necessary for the structure can be reliably ensured for the outer wall portion. The fixing strength of the first slit member can be increased by driving a headless nail from the side surface opposite to the joint rod to the joint rod.

  As the support used in the above construction method, a support provided with a holding part protruding in a horizontal state on the back side of the joint rod is suitable. In this case, in order to hold the first slit material in the holding portion, it is possible to adopt appropriate means such as sticking with an adhesive tape, use of an adhesive, or forming into a groove shape and inserting into the inside thereof. it can. Moreover, what is necessary is just to select the optimal thing according to the shape etc. as a raw material of a support tool, such as a synthetic resin and a metal. In addition, the 1st slit material which the support tool used by this invention makes object, and the 2nd slit material which comprises this 1st slit material and comprises a horizontal slit material are moderate with respect to compressive force. Any material may be used as long as the volume decreases. Specific examples include, for example, a calcium silicate plate, a calcium carbonate foamed material, and a foamed polymer material typified by foamed polyethylene, but of course not limited thereto. .

  Furthermore, you may provide an anchor part of an appropriate shape in a support tool. In this case, the anchor part greatly resists the pulling force applied to the support and the first slit member when removing the vertical formwork, so that it depends only on the adhesion to the concrete surface. The fixing strength is significantly increased as compared with the above, and it can be surely prevented that they are pulled out together with the joint rod.

  Further, in the present invention, the first slit material provided with a plurality of through-holes penetrating in the vertical direction at predetermined intervals along the longitudinal direction is an object, and in addition to the above configuration, the first slit is formed in the holding portion of the support tool. You may provide the hole connected to the through-hole of material. In this case, since these holes play a role of venting the air when placing the concrete, air accumulates on the back side of the first slit material projecting in the horizontal direction with respect to the vertical formwork. The concrete filling property is improved. Furthermore, by appropriately selecting the size and arrangement of these holes, it is possible to fill the holes with concrete and to expect an anchor effect.

  The construction method of the outer wall using the horizontal slit material by this invention is the inside of the joint part formed in the horizontal joint part of the beam which makes a part of outer wall of a lower floor, and the outer wall (unstructured wall) lower end side of an upper floor. In embedding one of the pair of horizontal slit members (first slit member), a joint rod on the inner surface of the vertical form forming the joint portion and a first slit member installed on the lower floor side Since the first slit material is held in a straight line by a support interposed between the two along the longitudinal direction and fixed on the joint rod side, it floats to the horizontal slit material when placing concrete It can be securely held at a predetermined position without causing any misalignment, and is not pulled out during demolding and is reliably left on the concrete side. Therefore, the slit width necessary for the structure can be reliably ensured for the outer wall portion.

  Furthermore, when an appropriately shaped anchor portion is provided on the support, even when a nail is used in combination to increase the fixing strength to the joint rod, together with the joint rod when removing the vertical formwork They can be surely prevented from exiting. Further, a horizontal slit member provided with a plurality of through-holes penetrating in the vertical direction at predetermined intervals along the longitudinal direction may be targeted, and the holding portion of the support having the above-described configuration may be provided with holes communicating with the through-holes. Good. In this case, since these holes play a role of removing air, air hardly stays on the back side of the horizontal slit member and the like, and the concrete filling property is improved. Furthermore, by appropriately selecting the size and arrangement of the holes, the hole is filled with concrete, and an anchor effect can be expected.

It is a whole figure of the outer wall structure which shows the application state of a horizontal slit material. It is a longitudinal cross-sectional view of the outer wall structure shown in FIG. It is a perspective view of the support tool for horizontal slit materials used by this invention. FIG. 3 is an enlarged cross-sectional view of the vicinity of a horizontal joint portion between an outer wall and a beam in FIG. 2. It is a perspective view which shows the installation state of the support tool used by this invention. It is a perspective view which shows the other example of the support tool used by this invention. It is a perspective view which shows the other example of the support tool used by this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 and FIG. 2 are an overall view and a longitudinal sectional view showing an application state of a horizontal slit material for earthquake resistance targeted for a support used in the present invention in a concrete building. In FIG. 1, an outer wall 1 that is a non-structural wall is surrounded by columns 2 and 2 on both sides, a beam 3 and a beam 4 on a lower floor, and a vertical slit member 5 is interposed between the outer wall 1 and the columns 2 and 2. However, the horizontal slit material 6 mentioned later is provided between the beams 4 of the lower floor. In this case, as shown in FIG. 2, the horizontal slit member 6 includes a first slit member 7 disposed on the beam 4 side of the lower floor and a second slit disposed on the lower end side of the outer wall 1 of the upper floor. The support 20 made of the material 8 and used in the present invention is embedded in the joint portion 9 along the longitudinal direction together with the first slit material 7.

  FIG. 3 is a perspective view in which a part of the support 20 is cut and enlarged. The illustrated support 20 is made of a synthetic resin such as polyvinyl chloride, and shares a holding section 21 having an L-shaped cross section for holding the first slit member 7 and a rising wall 21 a of the holding section 21. The connecting portion 22 having a substantially U-shaped cross section provided on the back side of the lever is the basic configuration. And this connection part 22 is used for fitting with the joint rod mentioned later in the case of installation. Furthermore, in this embodiment, the anchor portion 23 is integrally formed obliquely below the horizontal portion 21b of the holding portion 21, and the horizontal portion 21b is provided with a hole 24. A plurality of the holes 24 are provided at predetermined intervals along the longitudinal direction of the support tool 20 as a whole.

4 is an enlarged cross-sectional view of the vicinity of the horizontal joint on the lower end side of the outer wall 1 on the upper floor and the upper side of the beam 4 on the lower floor in FIG. Here, the first slit material 7 is made of a material having moderate elasticity such as foamed polyethylene, and only one of them is formed in a trapezoidal shape with an inclined cross section, and a through hole 7a penetrating in the vertical direction is formed in the longitudinal direction. A plurality are provided along. And in a state fixed to the holding portion 21 of the support tool 20 used in the present invention, a longitudinal position inside the joint portion 9 formed at a predetermined position, that is, an upper end portion of the outer surface of the beam 4 on the lower floor forming a part of the outer wall. It is arranged along the direction. Further, the second slit material 8 is between one slit material main body 8b having an inclined surface 8a on the joint portion 9 side and the other slit material main body 8c formed in the rectangular cross section with the same width, An incombustible material 8d such as rock wool is provided, and these are sandwiched from two surfaces by two resin cloth tapes (not shown). The slit material bodies 8b and 8c are both made of foamed polyethylene. And it is juxtaposed on the upper surface of said 1st slit material 7 in the inclined side edge part containing this inclined surface 8a. The angle of the inclined surface 8a is optimally 45 degrees, but is not necessarily limited to this angle, and can be changed as appropriate according to use conditions and the like, and the inclined surface 8a is inclined in a curved shape. Even in the case of the curved surface, there is no great difference in the effect of preventing the occurrence of cracks in the outer wall 1. Incidentally, when the angle of the inclined surface 8a in the second slit member 8 having the width W is 45 degrees, the width ω and the thickness L of the first slit member 7 can be expressed by the following relational expressions, respectively.
ω ≧ W
L ≧ √2W
Further, in this embodiment, an anchor reinforcing bar 10 is embedded through the second slit member 8 between the outer wall 1 of the upper floor and the beam 4 of the lower floor, so that the upper surface side cuts the adhesion of concrete. The bottomed cylindrical plastic cover 11 is covered. Further, the inside of the connecting portion 22 of the support 20 after the joint rod is removed is filled with the caulking 13 material via the backup material 12. In addition, if a water-stopping material such as a butyl rubber sheet is provided on the bottom surface portion adjacent to the inclined surface 8a of the second slit material 8 and the first slit material 7, the waterproof property at the joint portion is further improved.

Next, the construction method of the slit material which concerns on this invention using the said support tool 20 is demonstrated based on FIG. 5 and FIG. First, the joint rod 15 is horizontally fixed to a predetermined position (a position corresponding to the joint portion 9 in FIG. 2 or 4) of the vertical mold (outer mold) 14 with a nail or the like. Next, when the support member 20 in a state in which the first slit member 7 is fixed to the holding portion 21 via an adhesive tape or the like is fitted into the connecting portion 22 from the back side of the joint rod 15, it is easy and reliable. Can be fixed to. If a headless nail is further driven from the inclined surface side of the first slit member 7, the fixing strength is further increased. Alternatively, the first slit member 7 may be attached to the holding portion 21 after only the support 20 is fitted to the joint rod 15. Its to and pouring the lower floor of concrete placed appropriately inside formwork to the upper surface position of the first slit member 7. In this case, the through-holes 7a provided in the first slit member 7 communicate with the holes 24 of the support tool 20, respectively, and as a result of these functioning as air vent holes, when concrete in the lower floor is placed In addition, air does not accumulate on the back side of the joint rod 15 and the support 20 protruding in the horizontal direction with respect to the vertical mold 14, and a dense filling state is obtained. After the concrete on the lower floor has hardened, place the second slit material 8 at the position shown in FIG. 4 and fix it to the concrete surface of the lower floor with adhesive tape, concrete nails, etc. Place concrete on the upper floors. When the concrete is hardened, the vertical form 14 and the joint rod 15 are removed, the backup material 12 is pushed into the connecting portion 22 of the support 20 embedded in the joint portion 9, and the caulking material 13 is filled outside. To do. Since the support 20 has the anchor portion 23, even when a headless nail is used in combination, it is not pulled out together when the vertical form 14 and joint rod 15 are removed. In addition, when using the 2nd slit material 8 which has the nonflammable material 8d as shown in FIG. 4, or the slit material lacking in fire resistance, what consists of a material rich in fire resistance as the caulking material 13 is applied. Is desirable.

  In the outer wall structure using the horizontal slit material 6 composed of the two types of slit materials 7 and 8 as described above, when the concrete on the upper floor is placed, the vertical mold 14 and the joint portion of the second slit material 8 are used. Since the concrete is surely filled in the gap with the side surface, the lower end of the outer wall is lower than that of the slit member having the rectangular cross section as in the conventional case even when the second slit member 8 is arranged at a position close to the outer surface of the wall. Cracks at the part are less likely to occur, and water stoppage is sufficiently secured. Moreover, since the 1st slit material 7 below it acts as a shock absorbing material with respect to the inclination part formed in the outer wall lower end surface of an upper floor, the slit width required on structure can be ensured reliably. .

  6 and 7 are perspective views showing another embodiment of the support used in the present invention. In the support tool 30 of FIG. 6, the holding | maintenance part 31 of the 1st slit material 7 is formed in the cross-sectional U shape of the space | interval substantially equal to the width | variety. When the first slit member 7 is inserted into the groove-shaped portion, the degree of fixing with respect to the support 30 is further increased. In addition, the connection part 32, the anchor part 33, and the hole 34 other than the holding part 31 are the same as those of the support tool 20 used in the first embodiment. Moreover, in the support tool 40 shown in FIG. 7, the holding | maintenance part 41 and the connection part 42 are the same as that of the support tool 20 of said 1st embodiment, and differ only in the point that the anchor part 43 is formed at right angle. The support tool 40 has a higher resistance to pulling force when the vertical mold 14 is removed than the others.

  It should be noted that a hole for venting or an anchor portion is not an essential requirement of the present invention, and may be appropriately provided as necessary. Furthermore, the shape, material, and the like of the support are not limited to this, and various modifications can be made within the technical idea of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Outer wall, 2 ... Column, 3, 4 ... Beam, 5 ... Vertical slit material, 6 ... Horizontal slit material,
7 ... 1st slit material, 8 ... 2nd slit material, 8a ... Inclined surface, 9 ... Joint part, 10 ... Anchor reinforcement, 12 ... Backup material, 13 ... Caulking material, 14 Vertical formwork, 15 joint rod, 20, 30, 40 ... support, 21, 31, 41 ... holding part, 22, 32, 42 ... connecting part, 23, 33, 43 ... anchor part, 24, 34 ... hole

Claims (4)

With respect to a predetermined position on the inner surface of the vertical formwork, the joint rod and the first slit member are held in a straight line by a support tool interposed along the longitudinal direction between the joint rod and the first slit member. After fixing the horizontal state on the side and placing the concrete up to the upper surface position of the first slit material to construct the outer wall of the lower floor, the second slit material is placed along the first slit material, The construction method of the outer wall using the horizontal slit material characterized by removing the vertical formwork and the joint rod after constructing the outer wall of the upper floor by placing concrete on the top.   The construction of the outer wall using the horizontal slit material according to claim 1, wherein the support member holds the first slit material by a holding portion that protrudes in the horizontal direction on the back side of the joint rod. Method.   The construction method of the outer wall using the horizontal slit material according to claim 1 or 2, wherein a headless nail is driven toward the joint rod from a side surface of the first slit member on the side opposite to the joint rod. In the interior of the horizontal joint formed at the upper end of the outer wall of the lower floor, a first slit member in a state of being held linearly by a support tool along the longitudinal direction is disposed, and the second A horizontal slit material is used, in which the slit material is placed along the first slit material, and the outer wall of the upper floor is formed by placing concrete on the upper portion, leaving the joint portion. Was the outer wall structure.

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