JP5743825B2 - Stepped joint material and horizontal slit structure with stepped joint material - Google Patents

Description

  In the present invention, walls, pillars, beams, floors, etc. (hereinafter collectively referred to as “concrete structures”) constituting a concrete building typified by an apartment house are vertically arranged. More particularly, the present invention relates to a stepped joint material installed in a horizontal slit having a step and a horizontal slit structure including the stepped joint material.

  Japan is known as an earthquake-prone country. In recent years, major earthquakes such as the Tohoku-Pacific Ocean Earthquake, the Hyogoken-Nanbu Earthquake, and the Niigata-ken Chuetsu Earthquake have occurred and have suffered enormous damage each time. On the other hand, high-rise concrete buildings such as office buildings and condominiums have progressed, and as a result, earthquake countermeasures such as earthquake-resistant structures and seismic isolation structures have advanced.

  As one of the earthquake countermeasures for concrete buildings, a “hanging method” is known in which a wall is suspended by a ceiling slab. FIG. 6 is a front view showing a wall body constructed by this hanging method. As shown in this figure, the wall body a is fixed only by the ceiling slab b, and a horizontal slit d which is a narrow gap is provided between the floor slab c on the lower end side, and between the column parts e on both sides. A vertical slit f is provided between them. Thereby, the wall body a and the floor slab c, and the wall body a and the column part e have a discontinuous structure (so-called “edge cutting”). Thus, since the wall body a and the surrounding concrete structure are “edge-cut”, for example, the column part e behaves independently at the time of an earthquake. As a result, the wall body a receives a bending moment and a shearing force. There is nothing.

  In the horizontal slit d shown in FIG. 6, joint materials are usually installed for the purpose of ensuring waterproofness, dustproofing, soundproofing, and the like equivalent to the wall body a. In FIG. 6, a horizontally disposed joint material g is installed in the horizontal slit d below the wall body a, and a vertically disposed joint material h is installed in the vertical slit f. These joint materials g (joint materials h) are disposed so as to fill the space in order to seal the horizontal slits d (vertical slits f) in order to ensure waterproofness, dustproof properties, soundproofing properties, and the like.

  Further, in order to prevent water from entering from the outside in the horizontal slit, a stepped portion i may be provided as shown in FIG. The step portion i constitutes a part of the horizontal slit d, and the bottom surface thereof is formed one step lower than the other bottom surface portions. Further, for the purpose of preventing water intrusion, a stepped portion i is provided on the boundary with the outside, that is, on the end side (periphery side) of the horizontal slit d.

  Conventionally, when constructing the horizontal slit d having the stepped portion i, a complicated procedure is required. The procedure will be described with reference to FIG. 7 is a cross-sectional view taken along the line XX shown in FIG.

  First, as shown in FIG. 7A, after the joint rod k is attached to the mold frame j, the step joint material d1 is sewn to the mold frame j with the long nails m. In many cases, a water return n made of vinyl chloride is attached to the step joint material d1.

  Next, concrete is placed as shown in FIG. By placing the concrete with the stepped portion joint material d1 installed, a step having an upper surface and a lower surface is provided on the finished surface of the concrete.

  After concrete curing, as shown in FIG.7 (c), the upper joint material d2 is mounted in the upper surface of concrete. At this time, the step joint material d1 and the upper joint material d2 are arranged so as to partially wrap. And the vertical joint material h is installed so that it may mount on the upper part of the upper joint material d2, and construction of the wall body a, the ceiling slab b, and the pillar part e is performed. In addition, a waterproof cube o is installed in a gap (FIG. 7C) formed between the step joint material d1 and the vertical joint material h to ensure prevention of water intrusion.

  The stepped horizontal slit in which two joint materials are arranged above and below is also disclosed in Patent Document 1 (especially FIG. 11), and is effective for the outer wall of a rain hanging portion where no hail or the like is present at the top. Yes.

Japanese Patent Laid-Open No. 2003-105882

  As described with reference to FIGS. 7A to 7C, conventionally, a very complicated procedure is required to construct the horizontal slit d having the stepped portion i. In particular, it is necessary to install two joint materials, ie, the step joint material d1 and the upper joint material d2, and it is necessary to pay attention to the joint material installation position in order to wrap them.

Moreover, in order to exhibit the waterproof function and the fireproof function in each of the step joint material d1 and the upper joint material d2, both joint materials must use materials having these functions, and this contributes to an increase in cost. It was.

  The subject of this invention is solving the problem which a prior art has. That is, it is to provide a stepped joint material that can facilitate the construction of the horizontal slit d having the stepped portion i and reduce the construction cost, and a horizontal slit structure including the stepped joint material.

  The present invention is made by paying attention to the point that a joint material that fits into a horizontal slit provided with a stepped portion and is not separated vertically (that is, an integral structure) is installed, and has a waterproof function. It was developed by focusing on the point of dividing the fireproof function into each member.

  The stepped joint material of the present invention is a joint material installed in a horizontal slit provided between a concrete structure and another concrete structure, and a part of the bottom side of the horizontal slit on the end side. Is provided with a step portion that forms a lower surface than the others, a main body member placed on a general portion excluding the step portion of the bottom surface of the horizontal slit, and a step that is fitted and installed in the step portion And the main body member and the step member have an integral structure.

  In the stepped joint material of the present invention, the main body member and the step member are made of different materials, and the main body member is made of a material having higher fire resistance than the step member, and the main body member and the step member Can be fixed to form an integrated structure.

  The stepped joint material of the present invention is a laminate in which the main body member includes a first layer and a second layer made of different materials, and the first layer has a higher fire resistance than the second layer. The second layer is made of a material having higher elasticity than the first layer and the second layer is provided on the bottom surface side, and the main body member and the step member are fixed to form an integrated structure. It can also be assumed.

  The horizontal slit structure of the present invention is a horizontal slit structure in which a step joint material is installed in a horizontal slit provided between a concrete structure and another concrete structure, and an end portion of the bottom surface of the horizontal slit. A step portion that forms a lower surface than the others is provided in a part of the side, and the step joint material includes a main body member and a step member, and is an integrated structure in which the main body member and the step member are fixed. Is mounted on a general portion of the bottom surface of the horizontal slit except the step portion, and the step member is fitted and installed in the step portion.

  In the horizontal slit structure of the present invention, the main body member and the step member are made of different materials, and the main body member is made of a material having higher fire resistance than the step member. Of these, it is possible to adopt a structure that is placed on the general part and the step member is fitted and installed on the step part.

  In the horizontal slit structure of the present invention, the main body member is a laminated body including a first layer and a second layer made of different materials, and the first layer has a higher fire resistance than the second layer. The second layer is made of a material having higher elasticity than the first layer, and the main body member is placed on the general part so that the second layer contacts the bottom surface of the horizontal slit. In addition, the step member may be installed by being fitted to the step portion.

The stepped joint material of the present invention and the horizontal slit structure provided with the stepped joint material have the following effects.
(1) The stepped joint material is an integral structure of the main body member and the step member, and is not separated as in the prior art. Can be installed.
(2) By assigning the waterproof function to the step member and the fireproof function to the main body member, it is not necessary to use a high-functional material for both, and the cost of the material can be reduced.
(3) Since the step member exhibits the waterproof function and the main body member exhibits the fire resistance function, a reliable waterproof function and fire resistance function can be expected as a horizontal slit.
(4) If the main body member has a two-layer laminated structure and the second layer body is made of a material having high elasticity, even if the main body member is installed on the non-land surface of an already constructed concrete structure, Corresponding to the unevenness of the layer, the gap of the slit can be reliably sealed.

Sectional drawing which shows the state by which the joint material with a level | step difference of this invention was installed in the horizontal slit provided with the level | step difference. (A) is a first step diagram showing a stage in which a floor slab is constructed, (b) is a second step diagram showing a stage in which a pier is removed, and (c) shows a stage in which a stepped joint material is installed. 3rd step figure, (d) is the 4th step figure which shows the stage in which the vertical joint material was installed. The perspective view which shows the state which installed the vertical joint material on the joint material with a level | step difference. The perspective view which shows a corner part when a level | step difference member is provided in the protrusion corner. The perspective view which shows a corner part at the time of the level | step difference member 21 being provided in the entering corner. The front view which shows the wall body constructed | assembled by the hanging construction method. (A) is a first step diagram at the stage where joint rods and step joints are attached to the mold, (b) is a second step diagram at the stage of placing concrete, (c) is an upper part on the upper surface of the concrete. The 3rd step figure of the stage in which the joint material was mounted.

[Embodiment]
One embodiment of a leveled joint material of the present invention and a horizontal slit structure provided with a leveled joint material will be described with reference to the drawings.

  First, the state where the step joint material of the present invention is installed will be briefly described. FIG. 1 is a cross-sectional view showing a state in which a stepped joint material 20 of the present invention is installed in a horizontal slit 10 provided with a step. As shown in this figure, the horizontal slit 10 is provided between a concrete structure placed below like a floor slab 30 and a concrete structure placed above like a wall (not shown in FIG. 1). A stepped joint material 20 is installed to fill the gap, that is, to seal the horizontal slit 10.

  Further, a step is provided on the bottom surface of the horizontal slit 10 in FIG. The bottom surface of the horizontal slit 10 is the top surface of the floor slab 30, and as shown in FIG. 1, the top surface of the floor slab 30 forms a two-step surface. In other words, the floor slab 30 is formed of a stepped portion 31 that forms a lower surface than the others and a general portion 32 excluding the stepped portion 31. For convenience, the upper surface of the stepped portion 31 is referred to as a lower step surface 31h, the upper surface of the general portion 32 is referred to as an upper step surface 32h, and a vertical surface at the boundary between the lower step surface 31h and the upper step surface 32h is referred to as a boundary surface 32v.

  When providing the level | step-difference part 31 in the horizontal slit 10, normally the boundary of a concrete building (indoor) and the exterior (outdoor), ie, the edge part side (in the horizontal slit 10) (for the purpose of preventing the penetration | invasion of the water from the outside) A step portion 31 is provided on the left side in FIG. That is, the vertical surface 31v formed outside the step portion 31 shown in FIG. 1 is generally the same surface as the outer wall surface.

  By providing the step portion 31 in this manner, even if water enters the horizontal slit 10 from the outside, it is unlikely that the water will run up to the upper step surface 32h, and the step joint material 20 has a waterproof function. Therefore, it is possible to reliably prevent water from entering the concrete building. In addition, although the horizontal slit 10 of the hanging construction method is illustrated and described here, the present invention is not limited to the horizontal slit 10 in this construction method, and the horizontal slit portion where the concrete structure is vertically adjacent, For example, various concrete structures such as a horizontal joint portion between a waist wall, a leaning wall, and a slab, or a horizontal joint portion of a scallop wall can be implemented in horizontal slit portions that are adjacent vertically.

(Laminated joint material)
Next, the configuration of the stepped joint material 20 will be described in detail. As shown in FIG. 1, the stepped joint material 20 is formed of a step member 21 installed in the step portion 31 and a main body member 22 installed in the general portion 32. The step member 21 and the main body member 22 have an integral structure, and are installed in the horizontal slit 10 as an integral object. For example, the step member 21 and the main body member 22 are integrally formed from the manufacturing stage, or after the step member 21 and the main body member 22 are manufactured as separate bodies, the both are fixed by bonding or other means. The main body member 22 has an integral structure.

  The step member 21 is installed so as to be fitted to the step portion 31. Specifically, the step member 21 is installed such that the bottom surface of the step member 21 is in contact with the lower step surface 31h and the back surface (vertical surface) of the step member 21 is in contact with the boundary surface 32v. Further, the main body member 22 is placed on the general portion 32 so that the bottom surface of the main body member 22 contacts the upper stage surface 32h. In FIG. 1, the shape of the step member 21 is L-shaped so as to be fitted to the step portion 31, but the bottom surface of the step member 21 is in contact with the lower step surface 31 h and the back surface of the step member 21 is If it contacts the boundary surface 32v, the shape of the level | step difference member 21 can be made into arbitrary shapes.

  The step member 21 and the main body member 22 can be made of the same material or different materials. In other words, the material of the step member 21 and the main body member 22 can be made different, and the functions of each can be divided. Considering that the horizontal slit 10 is one of the purposes of blocking (or delaying) the intrusion of flames on the upper and lower floors in the event of a fire, the main body member 22 is required to have a fire resistance function and exhibits this function. It needs to be made of an easy material. On the other hand, considering that the step portion 31 has one of the purposes of preventing water from entering from the outside, the step member 21 is required to have a waterproof function and needs to be formed of a material that easily exhibits this function. There is.

  When the body member 22 is required to have a fireproof function, examples of the material include calcium carbonate foam, rock wool, ceramic fiber, and calcium silicate. In addition to these, metals such as iron and alloys can be mentioned, but careful consideration is required to adopt them in terms of manufacturing cost and workability due to weight. Moreover, when the waterproof function is requested | required of the level | step difference member 21, resin, such as polyethylene (PE) and polypropylene (PP), can be illustrated as the material.

  When a resin such as PE or PP is adopted as the material of the step member 21, it is still preferable because it has an effect that it can follow the unevenness formed on the surface of the lower step surface 31h. Normally, the top surface of the concrete is carefully leveled with a gold trowel etc., but it cannot be completely leveled by a person, so it is not suitable for the top surface of the floor slab 30 (lower step surface 31h or upper step surface 32h). The land (uneven surface) remains. If a flat surface that is difficult to deform is placed on the uneven surface, a small gap remains, which is a factor that impairs waterproofness and fire resistance. However, since resins such as PE and PP have high elasticity (the ability to easily elastically deform), they are deformed following the unevenness of the concrete surface, leaving no gaps.

  When a material having high fire resistance such as calcium carbonate foam, rock wool, ceramic fiber, calcium silicate, etc. is adopted as the material of the main body member 22, its elasticity is not so high. When placed, it remains high on the convex and a small gap remains, which impairs waterproofness and fire resistance.

  Therefore, as shown in FIG. 1, the main body member 22 can have a laminated structure of a first layer body 22a and a second layer body 22b. That is, the first layer body 22a is made of a material having higher fire resistance than the second layer body 22b, such as calcium carbonate foam or rock wool, and the second layer body 22b is made of a first layer such as PE or PP. A material having higher elasticity than that of the second layer body 22b is used as the bottom surface side. As a result, the fire resistance performance of preventing the flame intrusion on the upper and lower floors is exhibited, and the effect of being able to follow the unevenness of the upper stage surface 32h is achieved, which is further preferable.

(Structure and construction procedure)
Next, the horizontal slit structure in which the stepped joint material 20 is installed and its construction procedure will be described. FIGS. 2A to 2D are step diagrams showing the order of constructing the horizontal slit structure in which the stepped joint material 20 is installed, and FIG. 2A is a first view showing a stage in which the floor slab 30 is constructed. Step diagram, (b) is the second step diagram showing the stage where the pier is removed, (c) is the third step diagram showing the stage where the stepped joint material 20 is installed, (d) is the vertical joint material installed It is the 4th step figure showing the done stage.

  First, as shown to Fig.2 (a), the formwork 4 and a reinforcing bar (not shown) are assembled, concrete is laid, and the floor slab 30 is constructed | assembled. At this time, the crosspiece 5 is fixed at a predetermined position of the mold 4.

  Next, as shown in FIG.2 (b), the pier 5 is removed after concrete placement. The space portion from which the pier 5 is removed is the step portion 31.

  Subsequently, as shown in FIG. 2C, the stepped joint material 20 having an integral structure is installed in the horizontal slit 10. At this time, the main body member 22 is placed on the general portion 32 so that the step member 21 is fitted to the step portion 31. Note that the joint rod 6 can be attached to a predetermined position of the mold 4 before the stepped joint material 20 is installed.

  Finally, a concrete structure (not shown) constructed above is constructed to complete a horizontal slit structure in which the stepped joint material 20 is installed. As shown in FIG. 2 (d), a vertical joint material 70 is installed at a predetermined location so as to be placed on the step joint material 20. FIG. 3 is a perspective view showing a state in which the vertical joint material 70 is installed on the step joint material 20. As shown in this figure, the vertical joint material 70 includes a substantially H-shaped locking member 71 (for example, made of hard vinyl chloride) and a core member 72 (for example, polystyrene foam with reinforcing paper, or with reinforcing paper in a cross-sectional view). The core material 72 is sandwiched between the locking materials 71 arranged at both ends. A joint rod (not shown) that is attached to the mold 4 and extends in the vertical direction is often inserted into the space on the side of the locking member 71 that does not hold the core member 72.

  As shown in FIG. 2D and FIG. 3, the locking member 71 of the vertical joint material 70 can be erected in the space formed by making the step member 21 L-shaped. That is, the length of the locking material 71 on both sides of the vertical joint material 70 (the length protruding downward) is changed, and the longer locking material 71 is placed on the step member 21, and the shorter locking material 71 is placed. Is placed on the main body member 22.

(Corner)
4 and 5 are perspective views showing a corner portion where the stepped joint material 20 is installed, FIG. 4 is a perspective view showing the corner portion when the step member 21 is provided at the protruding corner, and FIG. It is a perspective view which shows a corner part when the level | step difference member 21 is provided in FIG.

  As shown in FIG. 4 and FIG. 5, when a step-shaped joint material 20 (hereinafter referred to as “act 20 s”) having a special shape is arranged in a corner portion such as an entrance corner or an exit corner, the whole can be easily accommodated. it can. By installing the accessory 20s in this way, the structure is excellent in continuity even in the corner portion, and the installation labor is reduced, which is extremely suitable. Even if the dimension of the accessory 30a becomes longer (or shorter) than planned, it can be appropriately handled by cutting the stepped joint material 20 at the site and adjusting the length.

  The stepped joint material of the present invention and the horizontal slit structure provided with the stepped joint material can be used in apartment buildings and office buildings such as condominiums, as well as in all building structures such as school buildings and warehouses. It can also be applied in the field of civil engineering structures, such as installing precast structures between abutments and bridge girders or on cast-in-place concrete foundations.

DESCRIPTION OF SYMBOLS 10 Horizontal slit 20 Stepped joint material 21 Step member 22 Main body member 22a 1st layer body 22b 2nd layer body 20s Accessory 30 Floor slab 31 Step part 31h Lower step surface 31v Vertical surface 32 General part 32h Upper step surface 32v Boundary surface 4 type Frame 5 Pier 6 Joint rod 70 Vertical joint material 71 Locking material 72 Core material a Wall body b Ceiling slab c Floor slab d Horizontal slit d1 Step joint material d2 Upper joint material e Column part f Vertical slit g (Horizontal arrangement) Joint material h Joint material (vertically arranged) i Stepped part j Formwork k Joint rod m Long nail n Water return o Waterproof cube

Claims (7)

In a horizontal slit provided between a concrete structure and another concrete structure, the joint material is installed,
Of the bottom surface of the horizontal slit, a part on the end side is provided with a step portion that forms a lower surface than the others,
A main body member placed on a general portion excluding the stepped portion of the bottom surface of the horizontal slit, and a stepped member fitted and installed on the stepped portion,
A stepped joint material, wherein the main body member and the stepped member have an integral structure. The main body member and the step member are made of different materials, respectively, and the main body member is made of a material having high fire resistance compared to the step member,
The step joint material according to claim 1, wherein the main body member and the step member are fixed to form an integral structure. The main body member is a laminate including a first layer and a second layer made of different materials, and the first layer is made of a material having higher fire resistance than the second layer, and The two layers are made of a material having higher elasticity than the first layer, and the second layer is provided on the bottom side,
The stepped joint material according to claim 1 or 2, wherein the main body member and the step member are fixed to form an integral structure. The stepped joint material according to claim 1, wherein an upper surface of the step member is located higher than an upper step surface of the general portion. A horizontal slit structure in which a step joint material is installed in a horizontal slit provided between a concrete structure and another concrete structure,
Of the bottom surface of the horizontal slit, a part on the end side is provided with a step portion that forms a lower surface than the others,
The step joint material includes a main body member and a step member, and has an integrated structure in which the main body member and the step member are fixed,
The main body member is placed on a general portion of the bottom surface of the horizontal slit except the step portion, and the step member is fitted and installed on the step portion. Horizontal slit structure. The main body member and the step member are made of different materials, respectively, and the main body member is made of a material having high fire resistance compared to the step member,
The horizontal body with a stepped joint material according to claim 5, wherein the main body member is placed on the general portion of the bottom surface of the horizontal slit, and the step member is fitted and installed in the step portion. Slit structure. The main body member is a laminate including a first layer and a second layer made of different materials, and the first layer is made of a material having higher fire resistance than the second layer, and The two layers are made of a material having higher elasticity than the first layer,
Claim wherein the second layer together with said body member so as to contact the horizontal slit bottom is placed on the general portion, characterized in that said step member is installed fitted to the stepped portion 5 Alternatively, a horizontal slit structure comprising the stepped joint material according to claim 6 .

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