JP2018071208A - Seismic slit material and construction method of earthquake resistant slit material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to recognize a construction defect of a seismic slit material generated during concrete placing at a time when the construction defect occurs. SOLUTION: The plate-shaped slit material main body 2 is composed of a support member 3 having grooves 4 and 5 extending on both sides of a bottom plate portion 3a, and is supported by at least one end of both ends of the slit material main body 2. In the seismic slit material 1 to which the groove 4 on one side of the member 3 is fitted, a part is fixed to the slit material main body 2 or the support member 3, and is fixed to the slit material main body 2 or the support member 3. When the seismic slit material 1 is installed between the wall formwork, a string-like body 10 is provided so as to penetrate the wall formwork 30 and project outward from the wall formwork 30. [Selection diagram] Fig. 3

Description

  The present invention relates to an earthquake-resistant slit material used for a reinforced concrete structure.

  For the purpose of ensuring the seismic performance of structural members in reinforced concrete buildings, there are structural members such as columns and beams and non-structural walls such as waist walls, hanging walls, and sleeve walls connected to the structural members. At the boundary part, a structural slit is formed which becomes a mechanical discontinuity with respect to the interlayer displacement. Usually, the structural slit formed at the boundary between the column portion and the non-structural wall portion is called a “vertical slit”.

  When forming the vertical slit, a technique of embedding a buffer material in concrete and blocking transmission of force between the structural member and the non-structural wall by a deformation function of the buffer material is often employed. The cushioning material has an appropriate elasticity and is formed of a material that is deformed with respect to an input load, but is restored to its original shape when unloaded. In the present specification, a vertical slit member composed of such a cushioning material and a support member that supports the cushioning material is referred to as “seismic slit material”.

  In patent documents 1-3, it is comprised from the slit member main body which consists of a buffer material, and the supporting member which fits to the joint material fixed to a pair of wall form frame while fitting to the both ends of the slit material main body. A seismic slit material is disclosed. The region between the wall molds is divided into two regions by the earthquake-resistant slit material, and a concrete frame such as a column portion or a wall portion is formed by alternately placing concrete in the two regions a plurality of times.

  As shown in FIG. 1, the earthquake-resistant slit material 51 receives a side pressure from the concrete when the concrete is placed. In particular, when the concrete placement height is large, a large lateral pressure acts on the earthquake-resistant slit material 51. As described above, the earthquake-resistant slit material 51 is configured such that the slit material body 2, the support member 53, and the joint material 20 are only fitted to each other, so that a large lateral pressure acts on the earthquake-resistant slit material 51. During the placement, the slit material body 2 may be detached from the support member 53, the support member 53 may be detached from the joint material 20, or the slit material body 2 may be bent and broken as shown in FIG. Moreover, the construction defect that the joint material 20 shift | deviates from the position fixed to the wall formwork 30 may also generate | occur | produce.

  In order to avoid the occurrence of such a construction defect, in Patent Documents 1 to 3, reinforcing metal fittings are installed at predetermined intervals along the height direction between the earthquake-resistant slit material and the separator adjacent thereto. It is disclosed to prevent displacement of the slit material for earthquake resistance. However, even if reinforcing metal fittings are provided, the allowable value of the concrete placement height only increases, and if the concrete is placed at a height higher than the allowable value, the above-described construction failure may still occur. Patent Document 2 discloses a technique for attaching a film of aluminum foil, polyethylene, or the like to the surface of the slit material main body in order to prevent bending fracture of the slit material main body. However, even in this case, if the concrete placement height increases and the seismic slit material receives a large lateral pressure, the slit material body may still bend and break. That is, even if the seismic slit material is reinforced, the situation in which construction failure such as misalignment may occur does not change unless proper construction is performed.

  If the position of the earthquake-resistant slit material deviates from the proper position during concrete placement, the earthquake-resistant performance of the structural member will not be exhibited as designed. For this reason, during or after placing concrete, it is necessary to confirm the burying position of the earthquake-resistant slit material and to take appropriate measures when the above-described construction failure occurs.

JP 2001-214611 A JP 2002-13311 A JP 2003-239565 A

  Among the above-mentioned construction failures, construction failures such as misalignment of joint materials and support members can be confirmed when the wall formwork is removed after placing the concrete. Usually, when the wall mold is removed, the joint material fixed to it is also removed. At that time, if the support member that should be visible from the trace hole of the joint material formed in the structural housing is not visible, the support member and the slit material body fitted to the support member are similarly displaced from the proper positions. Therefore, it is possible to recognize the occurrence of defective construction. Also, even if the joint material is not removed together when the wall formwork is removed, the joint material that should be visible on the surface of the structural frame cannot be confirmed or the joint material can be confirmed. Even if the joint material is displaced from the proper position, the support member fitted to the joint material and the slit material body fitted to the support member are similarly displaced from the proper position. Therefore, it is possible to recognize the occurrence of construction defects.

  However, with respect to construction defects such as bending fracture of the slit material main body and separation of the slit material main body from the support member, the joint material and the support member are present at appropriate positions when the wall mold is removed even if the construction failure occurs. For this reason, it is difficult for the installer to confirm in what state the slit material body exists inside the concrete. For example, even if the installer looks into the wall formwork from above while placing concrete, the lower part of the earthquake-resistant slit material is hidden behind the already placed concrete, and the position of the slit material body shifts at that part. Even if this occurs, it is difficult for the installer to recognize the positional deviation.

  In addition, even if it is found that the construction failure of the slit material body is found at the time of demolding the wall formwork, the concrete is already in a hardened state. It is necessary to cut it with a large amount of work. For this reason, there is a problem that the cost is significantly increased along with the delay of the construction period accompanying the repair work.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to make it possible to recognize a construction failure of an earthquake-resistant slit material that has occurred during concrete placement when the construction failure occurs. .

  The present invention for solving the above problems comprises a plate-shaped slit material main body and a support member having groove portions extending on both sides of the bottom plate portion, and at least one end of the both ends of the slit material main body includes the support. An earthquake-resistant slit material in which a groove portion on one side of the member is fitted, and is partially fixed to the slit material body or the support member and is not fixed to the slit material body or the support member When the seismic slit material is installed between the wall molds, the portion is provided with a string-like body that penetrates the wall mold and protrudes outward from the wall mold. .

  In addition, the present invention according to another aspect is fitted to at least one end portion of both ends of the plate-shaped slit material main body with the groove portion on one side of the support member in which the groove portion extends on both sides of the bottom plate portion, A boundary portion between the column portion and the wall portion by placing concrete between the wall mold frames in a state in which the groove portion on the other side of the support member and the joint material fixed to the inner surface of the wall mold frame are fitted. A method of constructing a seismic slit material embedded in a wire, wherein a part of a string-like body is fixed to the slit material body or the support member, and is fixed to the slit material body or the support member of the string-like body. It is characterized in that the concrete is placed in a state in which the unexposed portion protrudes outward from the wall mold through a through hole provided in the wall mold.

  In addition, the string-like body includes, for example, a paper string, a rubber string, a vinyl string, etc. in addition to a string made by bundling fibers, but the “string-like body” according to the present invention is limited to these strings. It is not necessary to be able to follow the deformation and displacement of the slit material body when a seismic slit material construction failure occurs. For example, an elongated wire may be used.

  The construction failure of the earthquake-resistant slit material generated during the concrete placement can be recognized when the construction failure occurs.

It is a top view which shows the state of the slit material for earthquake resistance at the time of concrete placement. It is a top view which shows the slit material for earthquake resistance which bent and fractured at the time of concrete placement. It is a top view which shows the slit material for earthquake resistance of the state fixed to the wall formwork based on embodiment of this invention. It is a perspective view which shows schematic shape of the slit material main body which concerns on embodiment of this invention. It is a top view which shows the slit material main body with which the string-shaped body which concerns on embodiment of this invention was fixed. It is a top view which shows the slit material for earthquake resistance which concerns on embodiment of this invention. It is a top view which shows the state of the slit material for earthquake resistance which concerns on embodiment of this invention at the time of construction defect generation | occurrence | production. It is a top view which shows the state of the slit material for earthquake resistance which concerns on embodiment of this invention at the time of construction defect generation | occurrence | production. It is a top view which shows the slit material for earthquake resistance installed in the wall form which concerns on another embodiment of this invention.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the present specification and drawings, elements having substantially the same functional configuration are denoted by the same reference numerals, and redundant description is omitted.

  As shown in FIG. 3, the earthquake-resistant slit material 1 according to this embodiment includes a plate-shaped slit material body 2 made of a cushioning material, two support members 3 fitted to the slit material body 2, and a slit material body 2. The string-like body 10 fixed to the head is provided.

  Each of the two support members 3 has the same shape. As shown in FIG. 4, the support member 3 is unidirectional (high in the state where the earthquake-resistant slit material 1 is fixed to the wall mold 30 as shown in FIG. A bottom plate portion 3a extending in the vertical direction). At both ends of the bottom plate portion 3a in the width direction W, first projecting portions 3b that project from the respective end portions substantially perpendicularly to the bottom plate portion 3a are formed. The first groove portion 4 b and the bottom plate portion 3 a form a first groove portion 4 extending in a substantially U shape for fitting the end portion of the slit material body 2 and the support member 3. Moreover, the 2nd protrusion part 3c which protrudes in the opposite direction to the 1st protrusion part 3b is also formed in the both ends of the width direction W of the baseplate part 3a. A second groove portion 5 extending in a substantially U shape for fitting with the joint material 20 is formed by the second projecting portion 3c and the bottom plate portion 3a. In the present embodiment, the shape of each groove is substantially U-shaped, but the shape of each groove is appropriately changed according to the shape of the slit material body 2 and the joint material 20.

  As shown in FIG. 4, a through hole 6 that penetrates from the first groove 4 to the second groove 5 is formed in the bottom plate portion 3 a of the support member 3. Three through holes 6 are formed at intervals along the longitudinal direction L of the bottom plate portion 3a.

A part of the string-like body 10 is fixed with an adhesive or the like in a state where the string-like body 10 is placed on the surface of the slit material body 2 along the outer shape of the slit material body 2 as shown in FIG. And the part which is not fixed to the slit material main body 2 of the string-like body 10 is passed through the through hole 6 of the support member 3, and the end of the string-like body 10 is outward of the support member 3 as shown in FIG. 6. Protruding state. Further, the string-like body 10 has a sufficient length l ₀ of the only project outwardly of the wall formwork 30 during seismic slit material 1 is placed between the wall formwork. The string-like body 10 is attached in the same state at the three through-hole forming portions. In addition, the material of the slit material body 2 is not particularly limited as long as it has an appropriate elasticity that is deformed with respect to the input load and is restored to the original shape at the time of unloading. For example, a foamed polyethylene plate or a phenol resin-based foam plate is used.

  The earthquake-resistant slit material 1 according to the present embodiment is configured as described above. Next, the construction method of the earthquake-resistant slit material 1 will be described.

  First, as shown in FIG. 3, the earthquake-resistant slit material 1 is installed between the wall molds so as to be fitted with the joint material 20 fixed to the wall mold 30. At this time, the seismic slit material 1 and the joint material 20 are fitted to each other while the string-like body 10 is passed through through holes (not shown) formed in the pair of joint materials 20 and the pair of wall molds 30. Thereby, the earthquake-resistant slit material 1 is installed in a state where the end of the string-like body 10 protrudes outward from the wall mold 30.

Subsequently, concrete is alternately placed a plurality of times in two regions between the wall molds partitioned by the earthquake-resistant slit material 1. At this time, when the slit material body 2 is deformed as shown in FIG. 7 by the side pressure from the concrete received by the earthquake-resistant slit material 1, the string-like body 10 fixed to the slit material body 2 is deformed. The portion of the string-like body 10 that protrudes outward from the wall mold 30 is pulled inward of the wall mold 30. That is, the length l _{1 of the} portion of the string-like body 10 that protrudes outward from the wall mold 30 is shorter than the length l ₀ before placing concrete. The construction worker can recognize the construction failure when the construction failure of the earthquake-resistant slit material 1 occurs due to such a change in the length of the string-like body 10. At this stage, since the concrete has not yet hardened, if the concrete placement work is immediately interrupted and repair work is started, repair work will be reduced compared to repair work after placement. Will do. Thereby, the time spent for repair work can be shortened.

  If the concrete can be cast to the end without shortening the length of the portion of the string-like body 10 protruding outward from the wall formwork 30, the seismic slit material 1 is embedded in an appropriate position. A structural housing such as a column part or a wall part can be formed.

  As described above, using the earthquake-resistant slit material 1 according to the present embodiment, concrete is struck in a state in which a portion of the string-like body 10 that is not fixed to the slit material body 2 is projected outward of the wall mold 30. By installing, when the construction failure of the earthquake-resistant slit material 1 occurs, the construction failure can be recognized immediately.

  In addition, if the string-like body 10 fixed to the slit material main body 2 is left as it is after placing the concrete, the fire resistance performance and waterproof performance as the earthquake resistant slit material 1 may be lowered. For this reason, it is preferable that the string-like body 10 is provided so as to be removable from the slit material body 2 after placing concrete. For example, when the joint material 20 is removed by removing the wall mold 30, the string-like body 10 may be configured to follow the joint material 20 and be removed.

  Further, as shown in FIG. 8, when the degree of construction failure of the earthquake-resistant slit material 1 is large and the entire string-like body is pulled inward of the wall mold 30, the string-like object is formed from the outside of the wall mold 30. Although it is easy to recognize the occurrence of construction failure because the presence of 10 is not visible, the degree of construction failure of the earthquake-resistant slit material 1 is small, and the length of the string-like body 10 protruding outward from the wall mold 30 is initially In the case where the length does not change so much, there is a concern that the contractor overlooks the change in the length of the string-like body 10 and delays the timing for recognizing the occurrence of construction failure. For this reason, the part which protrudes outward of the wall form 30 of the string-like body 10 is provided with a color or pattern that makes it easier to recognize the change in the length of the string-like body 10, and the slit material during concrete placement It is preferable that the state of the main body 2 can be determined. For example, the mark may be attached as follows.

  First, a certain section of the end portion of the string-like body projecting outward from the wall mold 30 is colored yellow as a section that requires attention to the occurrence of poor construction accompanying the deformation of the slit material body 2. Then, a certain section on the end side further than the yellow section is colored red as a section in which construction failure occurs due to excessive deformation or displacement of the slit material body 2. By attaching the mark in this way, when the string-like body 10 is pulled inward of the wall mold 30 and the yellow section of the string-like body 10 reaches the wall mold 30, the string-like body in that state It becomes easy for the installer who has seen 10 to recognize that the construction failure of the slit material 1 for earthquake resistance is about to occur. Moreover, when the red section of the string-like body 10 reaches the wall formwork 30, it is easy for the installer who sees the string-like body 10 in that state to recognize that the construction failure of the earthquake-resistant slit material 1 has occurred. Become.

  Further, if such a mark is attached to the string-like body 10, for example, when concrete is cast on the column side, the concrete is cast when the yellow section of the string-like body 10 reaches the wall formwork 30. It is also possible to carry out construction that interrupts the installation and starts placing concrete on the wall side. By placing the concrete on the wall side in this way, the earthquake-resistant slit material 1 receives a side pressure from the opposite direction to that of the concrete on the column side, and when the concrete on the column side is placed. It is possible to reduce the degree of deformation of the slit material body 2 that has occurred. As a result, it is possible to perform the concrete placing work in a state in which the earthquake-resistant slit material 1 is more reliably kept at the proper position.

  In the present embodiment, a part of the string-like body 10 is fixed to the slit material body 2, but a part of the string-like body 10 may be fixed to the support member 3. Even in this case, as can be seen from FIG. 7, the length of the string-like body 10 protruding outward from the wall mold 30 is shortened by the deformation of the earthquake-resistant slit material 1 (slit material body 2). It is possible to recognize a construction failure of the earthquake-resistant slit material 1 during concrete placement. Further, in the present embodiment, the string-like body 10 is passed through a through hole (not shown) formed in the joint material 20, but the string-like body 10 is wound on the surface of the joint material 20 as shown in FIG. You may make it. That is, if a part of the string-like body 10 is fixed to the slit material body 2 and the portion not fixed to the slit material body 2 is configured to protrude outward from the wall frame 30, The path of the string-like body 10 is not particularly limited. In the present embodiment, one string-like body 10 is used between a pair of wall molds at the same height. However, a plurality of string-like bodies 10 may be used. For example, one end of two string-like bodies is fixed to the slit material body 2, and the other end of one string-like body protrudes outward from one wall mold 30, and the other The other end of the string-like body may protrude outward from the other wall mold 30. Even in this case, it is possible to recognize the construction failure of the earthquake-resistant slit material 1 from the change in the length of the string-like body protruding outward from the wall mold 30.

  In the present embodiment, three string-like shapes are spaced along the longitudinal direction L of the bottom plate portion 3a of the support member 3 (the height direction when the earthquake-resistant slit material 1 is installed between the wall molds). Although the body 10 is provided, the number of the string-like bodies 10 provided along the longitudinal direction L of the bottom plate portion 3a of the support member 3 is not limited to this. However, in the case where there is no abnormality in the joint material 20 and the support member 3 after the placement of the concrete and only the slit material body 2 is partially bent and broken, the string-like body 10 has a height corresponding to the bent and broken portion. The length of the string-like body 10 protruding outward from the wall mold 30 is not provided and the portion other than the bent fracture portion of the slit material body 2 is present at an appropriate position. May not change. For this reason, it is preferable to provide a plurality of string-like bodies 10 at intervals along the longitudinal direction L of the bottom plate portion 3a of the support member 3 in order to be able to recognize the occurrence of construction failure more reliably.

  Moreover, in this embodiment, although the vertical slit was comprised between wall-form frames using the earthquake-resistant slit material 1 which fitted the two support members 3 to the both ends of the slit material main body 2, You may comprise a vertical slit (what is called a partial slit) only in a part between wall molds using the earthquake-resistant slit material 1 which attached the supporting member 3 only to one edge part among both ends. Even in this case, it is possible to recognize the occurrence of the construction failure from the change in the length of the string-like body 10 protruding outward from the wall mold 30.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to this example. It is obvious for those skilled in the art that various changes or modifications can be conceived within the scope of the technical idea described in the claims. It is understood that it belongs to.

  The present invention can be applied to the construction of a seismic slit material.

DESCRIPTION OF SYMBOLS 1 Seismic slit material 2 Slit material main body 3 Support member 3a Bottom plate part 3b 1st protrusion part 3c 2nd protrusion part 4 1st groove part 5 2nd groove part 6 Through-hole 10 String-like body 20 Joint material 30 Wall type frame 51 of a conventional seismic slit member 53 prior support member L bottom plate portion longitudinally l ₀ wall formwork of the string-like body end projecting outward length of (hitting設前)
l Length of end of string-like body projecting outward from _one wall formwork (after placing)
W Bottom plate width direction

Claims (6)

It consists of a plate-shaped slit material body and a support member with grooves extending on both sides of the bottom plate,
An earthquake-resistant slit material in which a groove on one side of the support member is fitted to at least one end of both ends of the slit material body,
When a part of the slit material main body or the support member is fixed, and the part not fixed to the slit material main body or the support member is installed between the wall molds, the seismic slit material is installed. An earthquake-resistant slit material provided with a string-like body that penetrates the wall mold and protrudes outward from the wall mold.   The seismic slit material according to claim 1, wherein the string-like body is provided so as to be removable from the slit material main body or the support member after placing concrete.   The mark which can discriminate | determine the state of the said earthquake-resistant slit material during concrete placement is attached to the part which protrudes outward of the said wall formwork of the said string-like body. Seismic slit material. A groove portion on one side of a support member having groove portions extending on both sides of the bottom plate portion is fitted to at least one end portion of both ends of the plate-shaped slit material body, and the groove portion and wall on the other side of the support member are fitted. Construction of earthquake-resistant slit material embedded in the boundary between the pillar and wall by placing concrete between the wall molds in a state where the joint material fixed to the inner surface of the mold is fitted A method,
Fixing a part of the string-like body to the slit material body or the support member;
Placing concrete in a state where the portion of the string-like body that is not fixed to the slit material main body or the support member is protruded to the outside of the wall mold through a through hole provided in the wall mold The construction method of the slit material for earthquake resistance.   The seismic resistance according to claim 4, wherein the string-like body is fixed to the slit material body or the support member so that the string-like body can be detached from the slit material body or the support member after placing concrete. Method of slitting material.   6. The earthquake-proofing device according to claim 4, wherein a mark that enables the state of the earthquake-resistant slit material during concrete placement to be discriminated is attached to a portion of the string-like body that protrudes outward from the wall formwork. Slit material construction method.

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