JP2024027852A - expansion joint - Google Patents

Abstract

To suppress occurrence of deflection into a gap of a cover when a substantially bellows-like expansion joint cover made of an elastic material is installed in a wide gap.SOLUTION: A deflection suppression mechanism is installed in a gap G, being adjacent to a back surface of an expansion joint cover 2. As the deflection suppression mechanism, a rod 6 having elasticity is used. By elongating this in the direction inclined with respect to the width direction of the gap G, it is stretched and mounted between skeletons A, B.SELECTED DRAWING: Figure 2

Description

The present invention relates to an expansion joint structure that covers a gap in a structure with an expansion joint cover (hereinafter also simply referred to as a "cover") made of an elastic material.

Structures (buildings) are constructed by dividing the structure into multiple frames and leaving gaps between them to avoid the effects of temperature changes on the frames that make up the structure or the effects of loads during earthquakes. An expansion joint is installed in the gap so that the frames on both sides of the gap are connected together and are deformed to absorb stress even if the frames are displaced in different directions.

For expansion joint covers, metal cover materials combine multiple members to form a movable mechanism, whereas elastic cover materials expand and contract to flexibly follow the movement, resulting in improved movability. It has the advantage that the expansion joint has a simple structure and requires fewer components.

In order to impart elasticity and contraction properties, such an elastic cover material is usually formed by providing an approximately bellows-shaped portion inside thereof that is bent or curved with a wave-shaped cross section (for example, see Patent Document 1), and the wall surfaces of the frame on both sides of the gap are Unlike metal covering materials that span the gap and cover the opening surface of the gap, the cover material is installed inside the gap and is housed within the gap, thereby creating a good design for the area where the gap is provided. (For example, see Patent Document 1).

Japanese Patent Application Publication No. 2007-9449

In a gap with a width of more than 200 mm in an indoor wall of a building, if this gap is covered with the conventional expansion joint cover made of elastic material, it will not be possible for a person to press their hand against the cover or lean over their shoulder. It becomes possible to do so. In such a case, if you push the cover with your hand or lean on it, the cover will bend due to the external force, and your hands and shoulders will fall into the gap to some extent, causing anxiety and danger to the person pushing or leaning on it. There is a risk that it will make you feel.
In an embodiment in which the expansion joint cover is installed in a wide gap, it is necessary to take measures to suppress the occurrence of deflection of the cover in the same direction when an artificial external force is applied from inside the gap toward the inside of the gap.

Further, when the conventional expansion joint cover made of an elastic material is enlarged, the weight of the cover itself increases as the size increases. Therefore, if the cover is installed in a gap provided in the ceiling of a building, it is inevitable that the cover will sag due to the weight of the cover itself. For expansion joints that are installed in gaps in the ceiling surface, it is necessary to install an expansion joint cover that takes measures to suppress the occurrence of sagging.

An object of the present invention is to solve the above-mentioned problems that occur when an expansion joint cover made of an elastic material is made larger than before and installed in a wide gap.

In order to solve the above problems, the present invention provides an expansion joint that covers the gap by installing an expansion joint cover formed in a substantially bellows shape using an elastic material between the building blocks facing each other across a gap provided in a structure. In,
The invention is characterized in that a deflection suppressing mechanism is provided in the gap adjacent to the rear surface of the expansion joint cover to restrict deflection of the expansion joint cover toward the rear surface.

According to the expansion joint configured as described above, when the building blocks are relatively displaced on both sides of the gap due to an earthquake, etc., the expansion cover itself, which is formed in a substantially bellows shape, follows the displacement and elastically deforms while expanding and contracting, thereby closing the gap. can be kept closed.
As mentioned above, when an expansion joint cover is installed in a wide gap on the wall inside a building, people may push the cover with their hands or lean on it. By providing a deflection suppressing mechanism on the back side, even if an external force is applied to the cover surface when the cover is pushed or leaned against, the cover is less likely to deflect inward to the gap, and the shape at the time of installation can be maintained. The hand or shoulder that presses the cover will not fall into the gap due to the deflection of the cover.

The deflection suppressing mechanism provided on the back side of the expansion joint cover uses, for example, an elastic rod, which is placed between the building blocks horizontally along the width direction of the gap, or in a direction inclined to the width direction of the gap. It can be arranged, attached and configured.
If an expansion joint cover is installed in a gap in a wall indoors, a short child may push the cover with their hand or a tall adult may lean on the cover. In other words, the expansion joint cover may Since external forces from inside the room are likely to be applied to the joint cover at a height of about 1500 mm from the floor, it is preferable to install the rod on the back side of the expansion joint cover in this range.
The rod can be installed horizontally along the gap width direction by connecting one end of the rod to one of the skeletons and connecting the other end of the rod to the other skeleton in an extended state. Alternatively, the rod can be installed in a state where the rod is extended and inclined with respect to the width direction of the gap, and both ends of the rod are connected to both the frame bodies. A plurality of rods may be strung between the frames on the back side of the expansion joint cover at intervals in the length direction of the gap.

The rod can be installed horizontally along the gap width direction, but when the rod is installed at an angle with respect to the gap width direction, it is difficult to install the rod horizontally along the gap width direction. This makes it possible to reduce the elongation rate when the expansion joint cover moves, so rods made of materials with a small elongation rate can also be used. This can be said to be advantageous since the load can be reduced. In addition, by arbitrarily changing the position where the rod is installed in an inclined direction, it is possible to use rods of the same length even in gaps of different widths, and the tensile strength (degree of elongation) can be adjusted as appropriate. It becomes possible to make adjustments.

For wide gaps, a plurality of the expansion joint covers are connected in series between the building blocks to cover the gap, and a deflection suppressing mechanism is installed on the back side of the expansion joint cover in the same way as above. , the cover can be made difficult to bend inward to the gap.
That is, an expansion joint provided in a wide gap is constructed by arranging a plurality of expansion joint covers in series along the width direction of the gap, and connecting the ends of adjacent covers to form an expansion joint cover. Connect the connecting parts of the ends of the expansion joint cover to the center position holding mechanism provided on the back side of the joint cover, and also connect the connection part between the ends of the expansion joint cover to the center position holding mechanism provided on the back side of the expansion joint cover. A configuration may be provided in which a deflection suppressing mechanism for regulating deflection is provided within the gap.

In the expansion joint provided in the wide gap, when an elastic rod is used as the deflection suppressing mechanism, the rod is extended in a direction oblique to the width direction of the gap, and the rod is extended between the building blocks or between the building blocks and the center holding mechanism. It can be installed by spanning between the provided center holding rod.

In the expansion joint having the above configuration, the expansion joint cover is attached to the building frame on both sides of the substantially bellows-shaped cover main body, in which mountain folds protruding from the front side of the cover and valley folds protruding from the back side alternately repeat. The cover main body has a flat part at the top of the mountain fold, a thick wall part at the end of the valley fold that protrudes toward the back side, and the cover main body has a flat part at the top of the mountain fold, and a thick wall part at the end protruding toward the back side of the valley fold. It is possible to use a cover having a shape in which four or more valley folds protrude from the back side of the cover.

The expansion joint cover can be formed of a material having rubber elasticity, preferably a thermoplastic elastomer, with appropriate elasticity and hardness, and when the size of the expansion joint cover is increased, the bellows As the number of mountain folds and valley folds in the cover body increases, the cover becomes more likely to sag. As a countermeasure against this tendency to sag, the expansion joint cover is designed so that its mountain folds and valley folds have a width (Wm) of the flat part of the mountain fold and a width (Wv) of the opening end of the valley fold. It is preferable that the size ratio (Wv:Wm) of (Wv:Wm) is in the range of 0.5 to 0.7.
If the dimensional ratio (Wv:Wm) of the width (Wm) of the flat part of the expansion joint cover and the width (Wv) of the opening end of the valley fold part is set in the range of 0.5 to 0.7, the cover It maintains its regular shape and can be installed in the gap without sagging. It should be noted that if the dimensional ratio exceeds 0.7, sagging is likely to occur due to an increase in the weight of the entire cover.

1 is a schematic external view of an embodiment of an expansion joint of the present invention. FIG. 2 is a schematic plan view of the expansion joint of FIG. 1; FIG. 2 is an end view of the expansion joint cover shown in FIG. 1; 4 is a partially enlarged view of FIG. 3. FIG. FIG. 3 is an external view of a rod for suppressing cover deflection. FIG. 3 is a view of the expansion joint of FIGS. 1 and 2 as seen from within the gap. FIG. 7 is a diagram showing an expansion joint in which a plurality of rods for suppressing cover deflection are installed in gaps. FIG. 7 is a schematic plan view of an expansion joint according to another embodiment of the present invention. FIG. 9 is a schematic front configuration diagram of the expansion joint in FIG. 8 with the cover removed.

A preferred embodiment of the present invention will be described based on the drawings. Note that the technical idea of the present invention is not limited to the embodiments described below.

FIG. 1 is a schematic external view of an embodiment of an expansion joint of the present invention, and FIG. 2 is a schematic plan view thereof.
The illustrated expansion joint 1 is installed at the joint between the inner walls of building blocks A and B, which face each other across a gap G provided on the indoor wall of a building, and the end A1 of the building block A faces the gap G. An expansion joint cover 2 is spanned between the end B1 of the frame B and the cover 2 covers the gap G that opens to the indoor side, and the inner wall surfaces A2 and B2 of the frames A and B are connected one by one with the cover 2. In addition, a rod 6, which is a mechanism for suppressing the deflection of the cover 2, is installed in the gap G on the back side of the cover 2. The illustrated embodiment shows a mode in which a gap G on an indoor wall surface having a gap width (Wg) of about 300 mm is covered with a cover 2, which will be described later.

Specifically, the expansion joint 1 connects both ends of the cover 2, which is formed to be expandable and contractible in the width direction of the gap G facing indoors, to the ends A1 and B1 of the frame A and frame B facing the gap G with anchor bolts. The gap G is covered with the cover 2 by connecting it to the supporting members 3, 3 fixed with fixing devices 4 such as the The cover 2 expands and contracts in accordance with the displacement to absorb the displacement, and the inner wall surfaces A2 and B2 of the frames A and B are maintained as an integral wall surface without any defects.

The cover 2 is a cover material made of an elastic material and has a width that covers the gap G, and is a bellows-shaped cover in which mountain folds 21 protruding from the front side and valley folds 22 protruding from the back side of the cover are alternately repeated. Attachment portions 23 and 23 connected to the support member 4 are provided on both sides of the main body, respectively, and are formed in a band shape along the length direction of the gap G, that is, the height direction of the inner wall surfaces A2 and B2. .

Specifically, the cover body of the cover 2 has a flat part at the top of the mountain fold 21 and a thick wall part at the end protruding toward the back side of the valley fold 22. It is provided in a shape in which five mountain folds 22 are arranged with a valley fold 22 in between. Further, the mountain fold portion 21 and the valley fold portion 22 of the cover 2 have the dimensions of the width (Wm) of the flat portion of the mountain fold portion 21 and the width (Wv) of the opening end of the valley fold portion, as shown in FIG. The dimensions are such that the ratio (Wv:Wm) falls within the range of 0.5 to 0.7. The width (Wec) between the mounting portions 23, 23 on both sides of the cover 2 is set to be approximately equal to or slightly smaller than the width (Wg) of the gap G.

As shown in FIG. 5, the rod 6 is a rod-shaped member made of a material having rubber elasticity, preferably a thermoplastic elastomer, and is expandable and contractible in the axial direction, similarly to the cover 2. Hook-shaped engaging hooks 61, 61 are integrally formed at both ends.
In this embodiment, the rod 6 is formed to have a length slightly larger than the width of the gap G, which is about 300 mm, and is placed adjacent to the back surface of the cover 2, as shown in FIGS. 2 and 6. , fixed to or supported by the support material 3 at the ends A1, B1 of the skeletons A, B, with tension applied between both ends thereof in a direction oblique to the width direction of the gap G. The hooks 61, 61 are engaged with the connecting members 5, 5, which are integral with the material 3, respectively, and are installed across the frames A, B at an angle with respect to the width direction of the gap G.

To construct the expansion joint 1, the support member 3 or the connecting member 5 integrated therewith is fixed to the ends A1, B1 of the frames A, B on both sides of the gap G, and the rod 6 is inserted between the connecting members 5, 5. Install the cover 2 in a direction inclined to the width direction of G, then connect the attachment parts 23, 23 on both sides of the cover 2 to the supporting members 3, 3, and install the cover 2 between the frames A and B. be able to.

In order to prevent the cover 2 from bending toward the back side, as shown in FIG. It may be constructed so as to span diagonally between the frames A and B.

8 and 9 show a configuration in which a plurality of the covers 2 are connected in series and attached between the frames A and B across a wide gap G. Note that FIG. 9 shows a schematic configuration of the expansion joint 1 shown in FIG. 8 when viewed from the front with the covers 2, 2 removed.

The expansion joint 1 shown in both figures fixes the support member 3 and the connecting member 5 to the ends of the frames A and B facing the gap G, and connects the ends between the support members 3 and 3. Two covers 2, 2 are arranged in series, and a pantograph-shaped center holding mechanism 7 is installed between both connecting members 5, 5, and the through member 71 constituting this center holding mechanism 7 is It connects the connecting parts between the ends of the covers 2, 2, and has elasticity that is a mechanism that suppresses the deflection of the covers 2, 2 between the back side of the covers 2, 2 and the center holding mechanism 7. It is constructed by attaching a rod 6.
The discontinuation holding mechanism 7 operates together with the covers 2, 2 when the ends of the covers 2, 2 are connected and the skeletons A, B are relatively displaced to expand or reduce the width of the gap G. It is provided so as to be slid along the width direction of the gap G, and to maintain the connecting portion between the ends of the covers 2, 2 within the gap G at the initial position of the covers 2, 2.

In this embodiment, as shown in FIGS. 8 and 9, a plurality of center holding mechanisms 7 are provided between the frames A and B along the length direction of the gap G with respect to the covers 2 and 2 that cover the gap G. It is constructed by connecting the centers of each mechanism with a through member 71, and a connecting member 5 is attached to a support member 3 attached to the center time keeping mechanism 7, and the rod 6 is connected in the width direction of the gap. The connecting member 5 is extended in an inclined direction and is attached to span between both the main bodies A and B and the connecting member 5.

Note that the illustrated configurations of the expansion joint and expansion joint cover are merely examples, and the present invention can be applied in any appropriate configuration depending on the installation location of the expansion joint indoors or outdoors, the size of the gap, etc.
In the above embodiment, the expansion joint cover 2 shown in FIGS. 3 and 4 was used, but other shapes may be used as long as the expansion joint cover 2 is formed into a substantially bellows shape using an elastic material. may also be used. In addition, an elastic rod 6 is used as a deflection suppressing mechanism, and is installed on the back side of the cover to prevent deflection of the cover in the same direction when an external force is applied from the surface of the cover to the inside of the gap. If it is possible to suppress this, other structures such as springs may be used.

1 Expansion joint, 2 Cover (expansion joint cover), 21 Mountain fold, 22 Valley fold, 23 Attachment part, 3 Support material, 4 Fixing member, 5 Connecting member, 6 Rod, 7 Center position holding mechanism, 71 Passing material , A, B skeleton, G gap

In order to provide stretchability, such elastic covering materials are usually formed with a roughly bellows-shaped portion that is bent or curved in a corrugated cross section. Unlike the metal covering material that covers the opening surface, the covering material is installed inside the gap and is housed within the gap, thereby creating a good design for the part where the gap is provided ( For example, see Patent Document 1).

The deflection suppressing mechanism installed on the back side of the expansion joint cover uses, for example, an elastic rod, which is not connected to the cover body of the expansion joint cover, but is placed between the building blocks horizontally along the width direction of the gap. , or may be arranged and attached in a direction oblique to the width direction of the gap.
If an expansion joint cover is installed in a gap in a wall indoors, a short child may push the cover with their hand or a tall adult may lean on the cover. In other words, the expansion joint cover may Since external forces from inside the room are likely to be applied to the joint cover at a height of about 1500 mm from the floor, it is preferable to install the rod on the back side of the expansion joint cover in this range.
The rod can be installed horizontally along the gap width direction by connecting one end of the rod to one of the skeletons and connecting the other end of the rod to the other skeleton in an extended state. Alternatively, the rod can be installed in a state where the rod is extended and inclined with respect to the width direction of the gap, and both ends of the rod are connected to both the frame bodies. A plurality of rods may be strung between the frames on the back side of the expansion joint cover at intervals in the length direction of the gap.

The rod can be installed horizontally along the gap width direction, but when the rod is installed at an angle with respect to the gap width direction, it is difficult to install the rod horizontally along the gap width direction. This makes it possible to reduce the elongation rate when the expansion joint cover moves, so rods made of materials with a small elongation rate can also be used. This can be said to be advantageous because the load can be reduced . In addition, by arbitrarily changing the position where the rod is installed in an inclined direction , it is possible to use rods of the same length even in gaps of different widths, and the tensile strength (degree of elongation) can be adjusted as appropriate. It is possible to adjust to.

In the expansion joint provided in the wide gap, when an elastic rod is used as a deflection suppressing mechanism, the rod is extended in a direction oblique to the gap width direction, and the rod is extended between the building blocks or between the building blocks and the center position holding mechanism. It can be installed by spanning between the center holding rod provided in the.

Specifically, the cover body of the cover 2 has a flat part at the top of the mountain fold 21 and a thick wall part at the end protruding toward the back side of the valley fold 22. It is provided in a shape in which five mountain folds 22 are arranged with a valley fold 22 in between. Further, the mountain fold portion 21 and the valley fold portion 22 of the cover 2 have the dimensions of the width (Wm) of the flat portion of the mountain fold portion 21 and the width (Wv) of the opening end of the valley fold portion, as shown in FIG. The dimensions are such that the ratio (Wv:Wm) falls within the range of 0.5 to 0.7. The width (Wec) between the attachment parts 23, 23 on both sides of the cover 2 is set to be approximately the same as the width (Wg) of the gap G, or slightly smaller than that.

The expansion joint 1 shown in both figures fixes the support member 3 and the connecting member 5 to the ends of the frames A and B facing the gap G, and connects the ends between the support members 3 and 3. Two covers 2, 2 arranged in series are provided, and a pantograph-shaped center position holding mechanism 7 is installed between both connecting members 5, 5, and a through member 71 constituting this center holding mechanism 7 is provided. Stretchability is a mechanism that connects the ends of the covers 2, 2 and further suppresses deflection of the covers 2, 2 between the back side of the covers 2, 2 and the center position holding mechanism 7. It is constructed by attaching a rod 6 having a diameter.
The center position holding mechanism 7 holds the covers 2, 2 when the ends of the covers 2, 2 are connected and the skeletons A, B are relatively displaced so as to expand or reduce the width of the gap G. It is also provided so as to be slid along the width direction of the gap G, and to maintain the connecting portion between the ends of the covers 2, 2 within the gap G at the initial position of the covers 2, 2.

In this embodiment , as shown in FIG. 8 and FIG. The center of each mechanism is connected by a through member 71, and a connecting member 5 is attached to a support member 3 attached to the center position holding mechanism 7, and the rod 6 is It is attached so as to extend in a direction that is inclined with respect to the direction, and span between both the building bodies A and B and the connecting member 5.

Claims (5)

In an expansion joint that covers the gap by installing an expansion joint cover formed in a substantially bellows shape using an elastic material between skeletons facing each other across a gap provided in the structure,
An expansion joint characterized in that a deflection suppressing mechanism is provided in the gap adjacent to the rear surface of the expansion joint cover to restrict deflection of the expansion joint cover toward the rear surface. In an expansion joint that covers the gap by installing an expansion joint cover formed in a substantially bellows shape using an elastic material between skeletons facing each other across a gap provided in the structure,
The expansion joint cover is configured by a plurality of expansion joint covers arranged in series along the width direction of the gap, and the ends of adjacent covers are connected to each other, and the expansion joint cover is provided on the back side of the expansion joint cover. A connecting portion between ends of the expansion joint cover is connected to the center position holding mechanism, and
An expansion joint characterized in that a deflection suppressing mechanism is provided in the gap adjacent to the rear surface of the expansion joint cover to restrict deflection of the expansion joint cover toward the rear surface. 3. The expansion joint according to claim 1, wherein the deflection suppressing mechanism is a rod having elasticity, and is configured to span between the building blocks facing each other with a gap in between. 4. The expansion joint according to claim 3, wherein the rod extends in a direction oblique to the gap width direction and spans between the frames. The expansion joint according to claim 1 or 2,
The expansion joint cover is formed by providing attachment parts to the building frame on both sides of a substantially bellows-shaped cover body in which mountain folds protruding on the front side and valley folds protruding on the back side alternate alternately. ,
The cover body has a flat part at the top of the mountain fold, a thick wall part at the end of the valley fold that protrudes toward the back side, and four thick parts on the back side of the cover between the two attachment parts. An expansion joint characterized in that the valley fold portion has a protruding shape.

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