JP6703443B2 - Laminated joint material, slit structure, and method of constructing slits - Google Patents

Description

In the present invention, walls, pillars, beams, floors, etc. (hereinafter collectively referred to as "concrete structures") constituting a concrete building represented by an apartment house and the like are mutually related. The present invention relates to a joint material installed in an adjacent part. More specifically, the present invention relates to a laminated joint material including two kinds of materials, a slit structure in which the laminated joint material is installed, and a construction method of the slit structure.

Japan is known as a country where earthquakes occur frequently, and in recent years, major earthquakes such as the Tohoku-Pacific Ocean Earthquake, the Hyogo-ken Nanbu Earthquake, and the Niigata-ken Chuetsu Earthquake have occurred, each of which suffers enormous damage. On the other hand, the rise of concrete structures such as office buildings and condominiums has progressed, and as a result, technology for earthquake countermeasures such as earthquake-resistant structures and seismic isolation structures has also advanced.

As one of the earthquake countermeasures for concrete structures, the "suspension method" is known in which the wall is suspended by the ceiling slab. FIG. 7 is a front view showing a wall body constructed by this suspension method. As shown in this figure, the wall a is fixed only by the ceiling slab b, and the floor slab c on the lower end side and the pillar portions d on both sides are provided with slits e which are narrow gaps, thereby providing a discontinuous structure. (So-called "edge cutting"). In this way, since the wall a and the surrounding concrete structure are “cut off”, for example, the column part d behaves independently during an earthquake, and as a result, the behavior of the wall a receives a bending moment and a shearing force. Never.

A joint material is usually installed in the slit e shown in FIG. 7 for the purpose of ensuring the same waterproofness, dustproofness, soundproofness and the like as the wall a. In FIG. 7, the horizontal joint material f is installed in the slit e below the wall a, and the vertical joint material f is installed in the slits e on both sides of the wall a. These joint materials f are arranged so as to fill the space in order to seal the slit e in order to ensure waterproofness, dustproofness, soundproofness and the like.

Further, since the joint material f seals the inside of the slit e and is also used as a form at the time of placing concrete on the wall body a, it requires performance such as fire resistance, water resistance, predetermined strength and elasticity. To be done. That is, fire resistance is the performance required to prevent the spread of fire at the time of fire, and water resistance is the performance required not only to prevent water leakage at the time of completion but also to absorb unnecessary water during concrete pouring. Is. Further, as shown in FIG. 7, the joint material f arranged at the lower portion of the wall body a is required to have a predetermined compressive strength in order to support the weight of fresh concrete (concrete that has not yet solidified) when the wall body a is placed in concrete. .. Further, after the concrete is hardened, the wall a suspended from the ceiling slab b contracts (shortens) to the upper side due to drying shrinkage or the like, so that the interval of the slits e widens, but in order to seal the inside of the slits e, this deformation It is also required to have the ability to follow. That is, the joint material f has a predetermined deformation performance (hereinafter, referred to as “elasticity”) such that the joint material f can be compressed and deformed by placing concrete on the wall a and can be expanded and deformed after the concrete is hardened. Is also required.

For example, there is a joint material f as shown in FIG. 8 as a joint material f that exhibits various properties such as fire resistance, water resistance, predetermined strength and elasticity (for example, Patent Document 1). FIG. 8 is a sectional view taken along the line YY shown in FIG. 7, and is a detailed view of the laminated joint material f. The joint material f shown in this figure is a laminated body including a first layer body f1 and a second layer body f2. That is, the plate-shaped first layer body f1 and the plate-shaped second layer body f2, which are substantially the same in plan view, are integrally formed by stacking them in the up-down direction (horizontal direction when installed in the vertical slit e). Has been done.

The first layer body f1 is made of a material having high fire resistance, and can prevent the intrusion and outflow of flames. Examples of the material of the first layer body f1 include calcium carbonate foam, rock wool, ceramic fiber, calcium silicate and the like.

The second layer body f2 is made of a material having high elasticity, and can follow the load of the adjoining concrete at the time of placing and the deformation at the time of shrinkage by drying. Further, even when the unplanned surface of the pre-built concrete structure is used as the joint material installation surface, the high elasticity of the second layer body f2 can seal the void of the slit in response to the unplanned state. It is possible. The second layer body f2 is made of a material having high water resistance and can prevent water from entering from the outside. The second layer body f2 is required to have water resistance and appropriate elasticity. Resins such as polyethylene (PE) and polypropylene (PP) can be exemplified as the material satisfying these performances.

JP, 2013-68009, A

As mentioned above, the joint material prevents the entry and exit of flames, prevents the entry of water from the outside, and further, in order to prevent dust and sound, the space of the slit is sufficiently filled so as to eliminate the gap. Is required. Therefore, a shape restoration evaluation test is performed to evaluate how much the temporarily pressed shape is restored to its original state. In the shape recovery performance test, for example, an iron rod 2 cm square from the direction perpendicular to the plane of the joint material is pressed against the plane portion of the joint material with a force of 21 N, then the pressing is stopped, and the surface of the joint material pressed It is determined to what extent the portion recovers to the planar shape in a predetermined time.

However, in the above-mentioned joint material f, the surface portion of the pressed joint material restores only up to 70% of the original plane shape in a predetermined time. Therefore, even if the joint material f is installed in the slit and the slit is sealed, when the shape of the joint material temporarily changes due to the pressure, a trace of the pressure remains and the joint material is filled. You can make a space (gap) in the slit. Then, fire, water, dust, sound, etc. will leak out from the gap, and the functions of fire protection, waterproofing, dust protection, soundproofing, etc. will deteriorate.

Therefore, the present invention provides a joint material that can be easily restored to its original state even if the shape is temporarily deformed by pressure from the outside.

A laminated joint material installed in a slit provided between a concrete structure and another concrete structure according to an embodiment of the present invention includes a first layer, a second layer, and a third layer that are different in material. The first layer is made of a material having higher fire resistance than the second layer, and the second layer has higher elasticity than the first layer. Of the first layer laminated with the second layer, the third layer is laminated on a surface different from a surface facing the second layer, and the third layer is And is made of a material having a high tensile strength, and a restoring force that returns from the distorted state under pressure to the original planar state by being stronger than that of the first layer. To do.

The third layer is a thin layer as compared with each of the first layer and the second layer.

The laminated body further includes a fourth layer made of a material having the same properties as the third layer, and the fourth layer is a thin layer as compared with the first layer and the second layer, respectively. And is formed between the first layer and the second layer.

According to another embodiment of the present invention, in a slit structure in which a laminated joint material is installed in a slit provided between a concrete structure and another concrete structure, the laminated joint material is made of a different material. A laminated body including a layer, a second layer, and a third layer, wherein the first layer is made of a material having higher fire resistance than the second layer, and the second layer is the first layer. The third layer is made of a material having a higher elasticity than that of the layer, and the third layer is laminated on a surface of the first layer laminated on the second layer, which surface is different from the surface facing the second layer. The tensile strength is stronger than that of the first layer, and the restoring force of returning from the state of being distorted by being pressed to the original planar state after being pressed is stronger than that of the first layer. It is made of a material and is sealed with the laminated joint material.

According to another embodiment of the present invention, a construction method of a slit provided between an already constructed already constructed concrete structure and a concrete structure for newly constructing a new concrete structure is the already constructed concrete. The structure includes a joint material installation step of installing laminated joint material, and a concrete placing step of placing the new concrete with the joint material installed, and the laminated joint material is different in material. A laminated body including a first layer, a second layer, and a third layer, wherein the first layer is made of a material having higher fire resistance than the second layer, and the second layer is The third layer is made of a material having elasticity higher than that of the first layer, and the third layer is formed on a surface different from a surface facing the second layer in the first layer laminated with the second layer. Properties that are laminated and have a higher tensile strength than the first layer, and that the restoring force that returns from the distorted state under pressure to the original flat state is stronger than that of the first layer In the jointing material installation step, the second layer side surface of the laminated jointing material is arranged on the jointing material installation surface of the already constructed concrete structure.

According to the present invention, it is possible to provide a joint material that can be easily restored to its original state even if the shape is temporarily deformed by pressure from the outside.

The front view which shows the state in which the laminated joint material of this invention was installed in the wall body constructed by the hanging construction method. FIG. 2 is a cross-sectional view taken along the line XX shown in FIG. FIG. 4 is a diagram illustrating a state of returning to the original horizontal state when the pressure applied from the direction perpendicular to the longitudinal direction of the laminated joint material 30 is eliminated (Example 1). FIG. 2 is a cross-sectional view taken along the line XX shown in FIG. FIG. 6 is a diagram illustrating a state of returning to the original horizontal state when the pressure applied from the direction perpendicular to the longitudinal direction of the laminated joint material 30 is eliminated (Example 2). (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 laminated joint material is installed on the floor slab, and (c) is a wall body and a pillar portion. FIG. 3 is a third step diagram showing a stage in which is started up. The front view which shows the wall body constructed by the hanging construction method. FIG. 12 is a cross-sectional view taken along the line YY shown in FIG. 11, which is a detailed view of a conventional joint material.

[Embodiment]
An embodiment of a laminated joint material, a slit structure including the laminated joint material, and a construction method thereof according to the present invention will be described with reference to the drawings.

First, a state in which the laminated joint material of the present invention is installed will be briefly described. FIG. 1 is a front view showing a state in which a laminated joint material of the present invention is installed on a wall body constructed by a hanging construction method. Note that FIG. 1 is the same as FIG. 6 except for the joint material installed, and those common to FIG. 6 are denoted by the same reference numerals. As described above, in the suspension method, the wall a is fixed only by the ceiling slab b (in FIG. 1, a broken line is drawn at the boundary between the ceiling slab b and the wall a, but it is actually an integral structure. ). A horizontal slit 10 is provided between the wall a and the floor slab c, and a vertical slit 20 is provided between the wall a and the pillar portions d on both sides. By providing these slits, the load acting on the wall a does not directly act on the surrounding concrete structure, and the wall a and other concrete structures behave independently when an earthquake occurs. To do. That is, the other concrete structure such as the pillar portion d is not subjected to the bending moment and the shearing force due to the behavior of the wall body a.

The horizontal slit 10 is a space formed between the wall a and the floor slab c, although it is a minimum. If the state of this space is completed, unnecessary things will invade from this space and sound will also leak. Therefore, in other words, in order to secure the same waterproofness, dustproofness, and soundproofness as the wall a, the horizontal slit 10 is installed so that the laminated joint material 30 fills the space. Similarly, a common joint material 40 is installed in the vertical slit 20. Although the laminated joint material 30 is installed only in the horizontal slit 10 in FIG. 1 for convenience, the laminated joint material 30 may be installed in the vertical slit 20. In addition, although the case of the hanging construction method is described as an example here, the present invention is not limited to this construction method, and portions where concrete structures are adjacent to each other, for example, a waist wall or a sag wall It can be carried out on various concrete structure adjoining parts, such as a vertical connecting part or a horizontal connecting part of a sail wall.

(Layered joint material)
Next, the structure of the laminated joint material 30 will be described in detail. FIG. 2 is a cross-sectional view (Example 1) taken along the line XX shown in FIG. 1 and is a detailed view illustrating the configuration of the laminated joint material 30. FIG. 3 is a diagram (embodiment 1) illustrating how the laminated joint material 30 returns to its original horizontal state when the pressure applied from the direction perpendicular to the longitudinal direction is removed.

As shown in FIGS. 1 and 2, the laminated joint material 30 has a plate shape. When viewed in plan, the shape is substantially rectangular, and the dimension (width) in the lateral direction is approximately equal to the thickness of the wall a, and the dimension (length) in the longitudinal direction is approximately equal to the dimension between the pillar portions d. Of course, the laminated joint material 30 of the present invention is not limited to such a shape, and in particular, the length may be shorter than the dimension between the pillar portions d. For example, when the dimension between the pillar parts d is 6 m, the length of the laminated joint material 30 can be set to 2 m, and three of these can be arranged in series between the pillar parts d.

Further, the thickness of the laminated joint material 30 is preferably set to be substantially equal to or slightly thicker than the height of the horizontal slit 10 between the wall a and the floor slab c. This is for reliably sealing the space of the horizontal slit 10 and ensuring the same waterproofness, dustproofness, soundproofness and the like as the wall a. For example, when the height of the horizontal slit 10 is about 1/100 of the height of the wall a, and the height of the wall a is about the floor height (about 3 m), the height of the horizontal slit 10 may be about 30 mm. .. That is, the thickness of the laminated joint material 30 in this case may be about 30 mm.

In this embodiment, two examples will be described below as variations of the laminated joint material 30.

As Example 1, a laminated joint material 30 including a first layer body 31, a second layer body 32, and a third layer body 33, as shown in FIG. 2, will be described. The laminated joint material 30 includes a plate-shaped first layer body 31, a plate-shaped second layer body 32, and a plate-shaped third layer body 33, which have substantially the same shape in a plan view, in the vertical direction (vertical slit 20. When installed on the left and right), they are integrally formed by stacking them in the horizontal direction.

The first layer body 31, the second layer body 32, and the third layer body 33 that form the laminated joint material 30 use different materials because the required performances are different.

Since the first layer body 31 is required to have fire resistance, it is made of a material having excellent fire resistance. Examples of the material include calcium carbonate foam, rock wool, ceramic fiber, calcium silicate and the like. In addition to these, metals such as iron and alloys can be used, but due to the manufacturing cost and workability due to weight, careful consideration is required before adopting them. The calcium carbonate foam is a desirable material for the first layer body 31 because it has excellent fire resistance, appropriate compressive strength, and elasticity capable of being deformed flexibly.

The second layer body 32 constituting the laminated joint material 30 is required to have water resistance and appropriate elasticity. Resins such as polyethylene (PE) and polypropylene (PP) can be exemplified as the material satisfying these performances. Further, in order to exert elasticity capable of being deformed more flexibly, it is suitable to adopt a foamed body of PE or PP, and more preferably, a foamed body of 30 to 40 times is preferable. The reason why such high elasticity is required is to cope with the unevenness of the surface on which the laminated joint material 30 is installed, and more specifically, the unevenness of the surface on which the laminated joint material 30 is installed is described. This is for reliably filling the voids that are generated by flexibly deforming in accordance with the above.

As described above, the first layer body 31 is required to have fire resistance performance, and the second layer body 32 is required to be water resistance performance and appropriate elasticity. In other words, the first layer body 31 does not necessarily need the water resistance performance and appropriate elasticity, and the second layer body 32 does not necessarily need the fire resistance performance. Of course, the first layer body 31 does not have the water resistance performance. Alternatively, the second layer 32 may have appropriate elasticity and the second layer 32 may have fire resistance.

As shown in FIG. 2, the second layer body 32 can be thinner than the first layer body 31. The reason why the second layer body 32 is made thin is to prevent the flame from entering or escaping through the gap even when the second layer body 32 is burnt out in the event of a fire.

The third layer body 33 is a thinner layer than the first layer body 31 and the second layer body 32, and is strong against pulling from both ends in the longitudinal direction and has an elastic force. Therefore, the third layer body 33 has a property of being restored to the original horizontal state or a state close thereto even if pressure is applied from the vertical direction of the longitudinal direction (laminating direction) and the third layer body 33 is temporarily bent. .. An example of the third layer body 33 is a thin fibrous member formed of a cellulose material such as paper. The third layer body 33 is attached to the surface of the first layer body 31 using, for example, an adhesive or an adhesive.

For example, when the length in the longitudinal direction of the laminated joint material 30 is 1 to 2 m, the width (depth) of the laminated joint material 30 is 120 mm to 300 mm, and the thickness of the laminated joint material 30 is in the range of 25 to 50 mm, the third layer The thickness of the body 33 may range from 0.05 to 0.1 mm. For example, more specifically, the length of the laminated joint material 30 in the longitudinal direction is 2 m, the width (depth) of the laminated joint material 30 is 150 mm, the thickness of the first layer body 31 is 20 mm, and the thickness of the second layer body. When the thickness is in the range of 5 mm, the thickness of the third layer body 33 may be 0.08 mm.

For example, it is assumed that the laminated joint material 30 is in the state shown in the upper diagram of FIG. 3 as the initial state. When pressure is applied to the laminated joint material 30 in this state (the upper diagram of FIG. 3) from the laminating direction, the third layer body 33 and the first layer body 31 are crushed downward as shown in the lower diagram of FIG. The upper surface of the laminated joint material 30 is bent. When the pressure is removed, the third layer body 33 and the first layer body 31 are restored to the original horizontal state or a state close to that, as shown in the upper diagram of FIG. At this time, the first layer body 31 alone cannot sufficiently restore the original horizontal state or a state close to the original state, but as the third layer body 33 returns to the horizontal state due to the elastic force of the third layer body 33, The upper surface of the first layer body 31 to which the three-layer body 33 is attached is also pulled up and sufficiently restored to the original horizontal state or a state close thereto.

Further, in the shape recovery performance test, the result was obtained that the surface portion of the pressed joint material was restored by 90% or more of the original plane shape in a predetermined time.

In this way, the first layer body 31 to which the third layer body 33 is attached is also forcibly forced to the third layer body 33 in accordance with the operation of restoring the third layer body 33 according to the pressure in the stacking direction. Follow the behavior of. As a result, when the pressure applied from the stacking direction is removed, it is easy to return to the original horizontal state or a state close thereto in an early stage. Therefore, it becomes difficult for the pressed marks to remain, it is difficult to form a space in the slit where the joint material is focused, and it is possible to prevent the invasion and invasion of flame, water, dust, sound, and the like.

In Example 1 described above, the laminated joint material 30 (single-sided attachment) in which the third layer body 33 is attached only to the upper surface of the first layer body 31 has been described. In Example 2, a laminated joint material 30 (double-sided bonding) in which the third layer body 33 is bonded to the upper and lower surfaces of the first layer body 31 will be described.

FIG. 4 is a cross-sectional view (Example 2) taken along the line XX shown in FIG. 1 and is a detailed view illustrating the configuration of the laminated joint material 30. FIG. 5 is a diagram (embodiment 2) illustrating a state of returning to the original horizontal state when the pressure applied from the direction perpendicular to the longitudinal direction of the laminated joint material 30 is eliminated.

The laminated joint material 30 shown in FIG. 4 is obtained by inserting the fourth layer body 34 between the first layer body 31 and the second layer body 32 of FIG. Similar to the third layer body 33, the fourth layer body 34 is a thin layer as compared with the first layer body 31 and the second layer body 32, and is strong against pulling from both ends in the longitudinal direction and has an elastic force. is doing. The third layer body 33 and the fourth layer body 34 may be made of the same material or different materials as long as they have the same properties.

For example, when the length in the longitudinal direction of the laminated joint material 30 is 1 to 2 m, the width (depth) of the laminated joint material 30 is 120 mm to 300 mm, and the thickness of the laminated joint material 30 is in the range of 25 to 50 mm, the third layer The thickness of the body 33 and the fourth layer body 34 may be in the range of 0.05 to 0.1 mm. For example, more specifically, the length of the laminated joint material 30 in the longitudinal direction is 2 m, the width (depth) of the laminated joint material 30 is 150 mm, the thickness of the first layer body 31 is 20 mm, and the thickness of the second layer body. When the thickness is in the range of 5 mm, the thickness of the third layer body 33 and the fourth layer body 34 may be 0.08 mm.

The fourth layer body 34 is attached between the first layer body 31 and the second layer body 32 by using, for example, an adhesive or an adhesive. In this state (upper diagram of FIG. 5), when a higher pressure than that in the first embodiment is applied to the laminated joint material 30 from the laminating direction, as shown in the lower diagram of FIG. The body 31, the fourth layer body 34, and the second layer body 32 are crushed downward, and the upper surface of the laminated joint material 30 bends. When the pressure is removed, the third layer body 33, the first layer body 31, the fourth layer body 34, and the second layer body 32 are restored to the original horizontal state or a state close thereto as shown in the upper diagram of FIG. To do.

At this time, the first layer body 31 alone cannot sufficiently restore the original horizontal state or a state close thereto, but the elastic force of the third layer body 33 and the fourth layer body 34 causes the third layer body 33 and the fourth layer body 34 to move. As the body 34 returns to the horizontal state, the upper surfaces of the first layer body 31 and the second layer body 32 to which the third layer body 33 and the fourth layer body 34 are attached are also pulled up to be in the original horizontal state. Or it is fully restored to a state close to it.

In particular, in comparison with the first embodiment, in the second embodiment, the fourth layer body 34 is used in addition to the third layer body 33, so that the restoring force is stronger than that of the first embodiment and the original horizontal state or a state close to it is obtained. It can be restored earlier.

In this way, the first layer body 33 and the fourth layer body 34 are adhered in accordance with the restoring operation of the third layer body 33 and the fourth layer body 34 in response to the pressure in the stacking direction. The layer body 31 and the second layer body 32 are forced to follow the operations of the third layer body 33 and the fourth layer body 34. As a result, when the pressure applied from the stacking direction is removed, it is easy to return to the original horizontal state or a state close thereto in an early stage. Therefore, it becomes difficult for the pressed marks to remain, it is difficult to form a space in the slit where the joint material is focused, and it is possible to prevent the invasion and invasion of flame, water, dust, sound, and the like.

In the present embodiment, a laminated joint material having a three-layer structure including the first layer body 31, the second layer body 32, and the third layer body 33, and the first layer body 31, the second layer body 32, and the third layer body. Although the laminated joint material having a four-layer structure including the layer body 33 and the fourth layer body 34 is used, the present invention is not limited to this, and further different layers may be stacked. Of course, in terms of manufacturing cost, it is desirable that the first layer body 31, the second layer body 32, and the third layer body 33 (further, the fourth layer body 34) be composed of three layers or four layers. It goes without saying that the technical scope of the present invention can be achieved by inserting or stacking layers between the layers.

(Structure and construction method)
Next, a slit structure in which the laminated joint material 30 is installed and a construction method thereof will be described. 6A to 6C are step diagrams showing the order of constructing the slit structure in which the laminated joint material 30 is installed, and FIG. 6A is a first step diagram showing a stage in which the floor slab c is constructed. , (B) is a second step diagram showing a stage in which the laminated joint material 30 is installed on the floor slab c, and (c) is a third step diagram showing a stage in which the wall a and the pillar portion d are raised. For the sake of convenience, the form and the reinforcing bar are not shown. Each step diagram will be described below.

As shown in FIG. 6A, the floor slab c is first constructed. Construction of this floor slab c is carried out through the usual steps of assembling predetermined reinforcing bars, installing a formwork, and placing concrete. After pouring the concrete, the top surface is carefully leveled with a metal trowel or the like. However, it is impossible for a person to level them completely, and unevenness (uneven surface) remains on the floor slab upper surface s.

After sufficiently curing the concrete of the floor slab c, as shown in FIG. 6B, a "joint material installation step" of installing the laminated joint material 30 on the upper surface s of the floor slab is performed. At this time, the laminated joint material 30 is arranged such that the second layer body 32 is the lower surface, that is, the floor slab upper surface s (laminated joint material installation surface) is in contact with the second layer body 32. This is because the high elasticity of the material of the second layer body 32 follows the unevenness of the upper surface s of the floor slab. The laminated joint material 30 may be simply placed on the upper surface s of the floor slab, but may be fixed by using an adhesive, concrete nails or the like.

After installing the laminated joint material 30 on the floor slab upper surface s (laminated joint material installation surface), a predetermined reinforcing bar and formwork are assembled, and the wall a and the pillar portion d (further, the ceiling slab b may be added). Implement the "concrete placing process" to place concrete. The vertical joints are installed between the front side (front side of the drawing) and the back side (back side of the drawing). At this time, since the floor slab c has already been poured into concrete, it is referred to as an "existing concrete structure", while a structure constructed after the laminated joint material 30 is installed is referred to as a "new concrete structure". .. That is, the laminated joint material 30 of the present invention is installed in the slit e between the already constructed concrete structure and the newly constructed concrete structure, and the laminated joint material installation surface of the already constructed concrete structure It is installed so that the second layer body 32 comes into contact with the generation surface), in other words, the surface of the first layer body 31 becomes the formwork surface of the new concrete structure.

Finally, as shown in FIG. 6C, the concrete of the ceiling slab b is poured to complete a series of structures. In FIG. 6C, a space is formed between the wall a and the floor slab c, and the laminated joint material 30 is installed in this space, and such a structure is provided with the “laminated joint material” of the present invention. Slit structure".

According to the joint material according to the present embodiment, even if the shape is temporarily deformed due to the pressure from the outside, it can be easily restored to the original state.

The present invention is not limited to the embodiments described above, and various configurations or embodiments can be adopted without departing from the scope of the present invention.

10 horizontal slit 20 vertical slit 30 laminated joint material 31 first layer body 32 second layer body 33 third layer body 34 fourth layer body 40 ordinary joint material a wall body b ceiling slab c floor slab d pillar part e slit f joint Material f1 First layer body f2 Second layer body s Floor slab upper surface

Claims (5)

And floor slabs already existing concrete structures built, the inside slits provided between the newly established concrete structures newly constructed on top of the floor slab, a laminated joint member to be installed,
A laminated body including a first layer, a second layer, and a third layer which are made of different materials,
The first layer is made of a material having higher fire resistance than the second layer,
The second layer is laminated on a side of the first layer that is in contact with the floor slab, and is made of a material having higher elasticity than the first layer,
The third layer is laminated on a side of the first layer laminated with the second layer, which is in contact with the new concrete structure, has a higher tensile strength than the first layer, and is pressed. A laminated joint material, which is made of a material having a restoring force that is stronger than that of the first layer to restore the original planar state when the pressure is removed from the distorted state. The third layer is a thin layer as compared with each of the first layer and the second layer,
The laminated joint material according to claim 1, wherein: The laminate further includes a fourth layer made of a material having the same properties as the third layer,
The fourth layer is a thin layer as compared with the first layer and the second layer, respectively, and is formed between the first layer and the second layer. Item 3. The laminated joint material according to Item 1 or 2. And floor slabs already existing concrete structures built, into the slit provided between the newly established concrete structures to be newly built on top of the floor slab, a slit structure laminated joint member is installed hand,
It said laminated joint member is a laminate configured to include a first layer made of a different material and the second layer and the third layer, the first layer, a high fire resistance compared to the second layer The second layer is made of a material having a higher elasticity than that of the first layer , the second layer being laminated on a side of the first layer that is in contact with the floor slab, and the third layer being Of the first layer laminated with the second layer, the first layer is laminated on the side in contact with the new concrete structure, has a higher tensile strength than the first layer, and is distorted by being pressed. It is made of a material having a restoring force that returns to the original plane state when pressure is lost, as compared with the first layer,
A slit structure provided with a laminated joint material, which is sealed with the laminated joint material. And floor slabs already existing set concrete structures built, and new concrete structures to be newly built on top of the floor slab, the method of constructing the slit provided between the,
In the floor slab , a joint material installation step of installing laminated joint material,
With the joint material installed, a concrete placing step of placing concrete,
It said laminated joint member is a laminate configured to include a first layer made of a different material and the second layer and the third layer, the first layer, a high fire resistance compared to the second layer The second layer is made of a material having a higher elasticity than that of the first layer , the second layer being laminated on a side of the first layer which is in contact with the floor slab, and the third layer being Of the first layer laminated with the second layer, the first layer is laminated on the side in contact with the new concrete structure, has a higher tensile strength than the first layer, and is distorted by being pressed. It is made of a material having a restoring force that returns to the original planar state when pressure is lost, as compared with the first layer,
In the jointing material installing step, a surface of the laminated slab on the second layer side is arranged on a jointing material installing surface of the floor slab .