JP7709749B2 - Construction Joints - Google Patents

Description

This invention relates to architectural fastening hardware that joins one column or beam to another beam by butting their ends. For example, a connecting base plate is fixed to the joining surface of one column or beam with a fixture (a fastening bolt that passes through), a connecting protruding plate protruding from the connecting base plate is inserted into the joint section of the end of the other beam that is to be joined by butting its ends, and a connector (drift pin) is passed through the joint section to connect the two columns or beams together.

For example, when joining one column to another horizontal member (beam), architectural fastening hardware is often used. This fastening hardware is, for example, a metal base plate part with one or more protruding connecting plates protruding in a T-shape, U-shape, or C-shape in plan view. For example, this base plate part is fixed to the joining surface of one column with a fixture (a fastening bolt that penetrates the column), and the connecting protruding plate part protruding from this base plate part is inserted into the upper and lower through slits of the joint part of the end of the other beam, and a connector (drift pin) is inserted through the connecting hole provided in the connecting protruding plate part and the through hole provided in the joint part of the end of the beam that is connected to it to connect them, thus firmly joining one column to the other beam.

Such metal fittings are manufactured in a variety of sizes with different top and bottom dimensions, and the size of the fitting that matches the beam configuration (the top and bottom dimensions of the beam) is selected and used. For example, if a beam with three different beam configurations (large, medium, and small) is used, three different types of fittings are also prepared accordingly (large, medium, and small), and one is selected and used depending on the beam configuration.

Therefore, in the past, it was necessary to manufacture and prepare various sizes of connecting fittings with different top and bottom dimensions, and the contractor had to obtain these and select the one to use depending on the beam configuration, which was troublesome.

On the other hand, it is also possible to install small-sized joint fittings side by side, one above the other, depending on the beam configuration. In other words, if only small-sized joint fittings are used and installed side by side, one above the other, depending on the beam configuration, there will be no need to prepare joint fittings of various sizes, and there will be no need to select the right fitting, and installation will be easier.

However, when doing this, the contact area of each metal fitting with the column becomes smaller (the smaller the contact area), and when a shear force is applied from above and below, a force is generated in each fitting that tries to rotate around the fixture attached to the column, which generates horizontal secondary stress in each drift pin. Also, as the number of drift pins on which this secondary stress occurs increases, the shear strength tends to be lower than when large metal fittings prepared according to the beam configuration are used. For this reason, it is hesitant to divide the metal fittings in this way and install them side by side (using multiple small metal fittings side by side, one above the other).

In other words, when multiple small-sized connecting fittings are used in parallel above and below, the shear strength is lower than when large connecting fittings prepared according to the beam configuration are used. Therefore, in order to provide a shear strength that corresponds to the design stress, a larger number of small-sized connecting fittings must be used, and the beam configuration must be set to match the number of small connecting fittings installed in parallel above and below, which significantly increases costs.

Even with large-sized joints prepared according to the beam configuration, the metal fittings themselves rotate to some extent, generating secondary stress in the connector (drift pin) located at the furthest position from the center of the height of the joint. The smaller the joint, the greater the effect of the secondary stress (the smaller the joint, the easier it is to rotate). This secondary stress occurs in the direction of the end of the beam that is attached to the joint, and it induces cracking from the beam through-hole through which the connector passes, so it is one of the factors that determine the maximum load.
The two places where secondary stress occurs (has a large impact) with connecting fittings prepared according to the beam configuration are the top and bottom; however, the small connecting fittings arranged side by side above and below rotate one by one, and secondary stress occurs individually, making it easy to induce cracking from the beam penetration holes, the maximum load does not increase, and therefore the shear strength tends to be low.
In addition, because the size of the connecting fittings makes them prone to rotation, the joints are prone to deformation, meaning that the rigidity of the joints is low, which is also a factor in reducing the shear strength.

To prevent this, for example, simply arranging the connecting fittings side by side one above the other and connecting them with bolts and nuts would not only be costly, but would also be extremely difficult to install and would be of little practical use.

In light of the current situation, the present invention has been made to solve the above problems, and aims to provide an innovative architectural fastener that is extremely practical, as it can ensure joint strength by arranging the required number of fasteners in line according to the beam configuration without having to prepare various sizes of fasteners, and is easy to install; even if a force that tends to rotate each fastener due to shear force is generated, causing secondary stress, this can be offset by the locking of the locking parts, reducing the number of connectors that generate secondary stress; and it can prevent a decrease in joint rigidity due to rotation suppression, thereby preventing a decrease in shear strength; and it can be realized with a simple configuration.

The gist of the present invention will be explained with reference to the attached drawings.

The present invention is a construction fastening metal fitting that connects a column 1 or a horizontal member 2 to a horizontal member 2 that is joined by butting the ends of the column 1 or the horizontal member 2, and joins the two together.
The connecting base plate 4 is fixed to the column 1 or the cross member 2 by a fixing device 3, and a connecting protruding plate 7 is disposed at a joint 5 of the cross member 2 where the ends are butt-joined, and is connected to the cross member 2 by a connector 6 inserted through the joint 5.
The connecting protruding plate portion 7, which is disposed at the joint portion 5 at the end of the cross member 2 and connected by the connecting device 6, has one or more hole-shaped or notched connecting holes 8 through which the connecting device 6 passes in the vertical direction,
An upper locking portion 9 is provided on the upper portion of the base side of the connecting protruding plate portion 7 disposed at the joint portion 5 of the cross member 2, which is closer to the connecting base plate portion 4,
A lower locking portion 10 that locks onto the upper locking portion 9 of another architectural fastening metal fitting to be arranged vertically in parallel is provided on the lower portion of the base side of the connecting protruding plate portion 7, which is vertically opposite to the upper locking portion 9, and is closer to the connecting base plate portion.
This architectural fastening hardware is characterized in that, when the other architectural fastening hardware is arranged side by side in the vertical direction, the side portions of the upper engaging portion 9 and the lower engaging portion 10 of the other architectural fastening hardware are arranged side by side in the protruding direction of the connecting protruding plate portion 7, and when the side portions of the upper engaging portion 9 and the lower engaging portion 10 abut against or deform, they enter an abutting and engaged state to resist a force that attempts to rotate the architectural fastening hardware and the other architectural fastening hardware arranged side by side in the vertical direction in the vertical direction.

The present invention relates to a fastening member for construction as described in claim 1, characterized in that the upper engaging portion 9 and the lower engaging portion 10 are integrally formed with the plate edge portion of the connecting protrusion plate portion 7 near the connecting base portion 4.

This relates to the architectural fastening hardware described in claim 2, characterized in that one of the upper locking portion 9 and the lower locking portion 10 is a locking convex portion integrally protruding and formed on the plate edge portion of the connecting protrusion plate portion 7 near the connecting base portion 4, and the other is a locking concave portion integrally formed as a recess, and is configured to resist a force that attempts to rotate the architectural fastening hardware and the other architectural fastening hardware arranged side by side in the vertical direction in the vertical direction by forming an abutting and locking state when the outer portion of the locking convex portion, which is the upper locking portion 9 or the lower locking portion 10, and the inner portion of the locking concave portion, which is the lower locking portion 10 or the upper locking portion 9, abut against or deform.

The construction fastening hardware described in any one of claims 1 to 3 is characterized in that it is configured in a U-shape when viewed from above, and a pair of the connecting protruding plate parts 7 are integrally formed facing each other on the left and right sides of the connecting base part.

The connecting protrusion plate portion 7 is disposed in the joint portion 5, and is set to a vertical dimension that allows multiple pieces to be arranged side by side in the vertical direction according to the vertical dimension of the cross members 2 that are connected by the connector 6 that is inserted through the joint portion 5.

Since the present invention is configured as described above, it is possible to ensure joint strength by arranging the required number of connecting fittings in parallel according to the beam configuration without having to prepare fittings of various sizes, which is easy to install. Even if a force that tends to rotate each connecting fitting due to shear force is generated, which generates secondary stress, this can be offset by the locking of the locking parts, reducing the number of connectors that generate secondary stress. In addition, the decrease in joint rigidity due to rotation inhibition is suppressed, and therefore the decrease in shear strength is suppressed. Moreover, this can be realized with a simple configuration, making this an extremely practical and revolutionary connecting fitting for architecture.

FIG. FIG. 2 is a perspective view of the embodiment as seen from below. FIG. FIG. FIG. FIG. 2 is a perspective view for explaining a state in which the embodiment is used. This is an explanatory side cross-sectional view showing the state in which the connecting fittings in this embodiment are installed and connected in a side-by-side state in an engaged state, in accordance with the beam configuration of this embodiment, to join a column and a beam. This is an explanatory side cross-sectional view showing the state in which the connecting fittings in this embodiment are installed and connected in a parallel state in an engaged state above and below in accordance with the beam configuration of the embodiment, joining the pillar and beam.

The optimal embodiment of the present invention will be briefly explained below, showing its function based on the drawings.

When joining one column 1 or cross member 2 (beam) to the other cross member 2 (beam), the connecting base section 4 is attached and fixed to the one column 1 or cross member 2 with a fixing device 3 (for example, a fastening bolt that is passed through), and a connecting protrusion plate section 7 is arranged at the joint section 5 of the other cross member 2 (beam) whose ends are butted together and joined, and a connector 6 (drift pin) is inserted to connect the connecting protrusion plate section 7 to the other cross member 2, joining the two together.

In other words, in the present invention, the connecting protrusion plate portion 7 of the connecting fitting, which is disposed at the joint portion 5 at the end of the cross member 2 and connected by the connector 6, is provided with one or more hole-shaped or notched connecting holes 8 through which the connector 6 passes, and the joint portion 5 at the end of the cross member 2 is provided with a beam through hole 13 that communicates with the connecting hole 8.

Therefore, the connecting protruding plate portion 7 protruding from the connecting base portion 4 fixed to the connecting side surface of one of the columns 1 or cross members 2 (beams) is configured to be connected to the joint portion 5 of the other cross member 2 by inserting the connector 6 (drift pin) into the connecting hole 8 that is in communication with it via the beam through hole 13.

In this type of fastener, an upper locking portion 9 is provided on the upper part of the base side of the connecting protrusion plate portion 7, which is closer to the connecting base plate portion 4, and a lower locking portion 10 that locks to the upper locking portion 9 of another fastener to be arranged vertically is provided on the lower part of the base side of the connecting protrusion plate portion 7, which is vertically opposite to the upper locking portion 9, closer to the connecting base plate portion.

Therefore, in the present invention, when the other present connecting fittings are arranged in the vertical direction in the required number according to the beam configuration (the vertical width of the beam 2 whose ends are to be butted), the upper locking portion 9 of the other present connecting fitting and the lower locking portion 10 of the present connecting fitting are arranged in the protruding direction of the connecting protruding plate portion 7 in a locked state, that is, at least the side edge portion that is a part of the upper locking portion 9 (for example, the outer edge portion on the tip side of the connecting protruding plate portion 7 if it is an engaging protrusion) and the side edge portion that is a part of the lower locking portion 10 (for example, the inner edge portion on the tip side of the connecting protruding plate portion 7 if it is an engaging recess) are butted against each other or are deformed to be in a butted and locked state.

Therefore, even if a downward shear force is applied to the other cross member 2 (beam 2 whose ends are butted together) from above, and a force that tends to rotate downward from the fixing device 3 occurs in each connecting metal fitting because the vertical dimensions of each fitting are relatively small, and a secondary stress is generated in the longitudinal direction (horizontal direction) of the beam 2, this is received (opposed to the force that tends to rotate) by the engagement between the upper locking portion 9 and the lower locking portion 10, so the secondary stress that tends to occur in the connector 6 (for example, a drift pin) is suppressed and the decrease in the rigidity of the joint is suppressed, resulting in a joint with no decrease in shear strength.

In other words, instead of having to prepare multiple types of connecting metal fittings with different vertical dimensions according to the beam configuration, the required number of these connecting metal fittings, which have relatively small vertical dimensions, can be installed side-by-side on the top and bottom of the column 1 according to the beam configuration, ensuring the connecting strength and improving workability.

Moreover, because the vertical dimensions of each of the metal fittings in the present invention are relatively small, the force that tends to rotate them can be resisted, and this can suppress the secondary stress generated in the drift pins 6. Also, the number of drift pins 6 where this secondary stress occurs can be reduced, so the shear strength is less likely to decrease, and this can be achieved with a simple configuration, making this a metal fitting with excellent practicality.

Specific examples of the present invention will be described with reference to the drawings.

In this embodiment, the present invention is applied to an architectural joint fitting (beam support joint fitting) that joins a column 1 to a cross member 2 (beam) whose end is butted and joined to the column 1 in a perpendicular state. The connecting base part 4 is fixed to the connecting side surface of the column 1 by a fixing device 3 (a means for passing a fastening bolt through the column fixing hole 15 from the outside of the column 1 through the column mounting through hole 14 and fastening it by tightening a nut), and a pair of connecting protruding plate parts 7 that are inserted into the joint part 5 (upper and lower through slits) of the cross member 2 (beam) whose end is butted and joined in a perpendicular state and are connected by driving multiple connecting devices 6 (drift pins) from the side to connect them to the cross member 2 are protruding in an opposing manner to form an architectural joint fitting (this joint fitting) made of metal plate that is U-shaped or C-shaped in plan view.

In other words, in this embodiment, the pair of connecting protruding plate parts 7 of this joint fitting, which is inserted into the joint part 5 (vertical through slit) at the end of the cross member 2 and connected by the connector 6 (drift pin), are configured to have multiple hole-shaped connecting holes 8 in the vertical direction through which the connector 6 (drift pin) passes and multiple notched connecting holes 8 at the end.

In addition, all or a selection of the connection holes 8 provided in each of a pair of connection protruding plate sections 7 protruding from the connection base section 4 are connected to the cross member 2 by inserting multiple connectors 6 (drift pins) from above and below through the beam through holes 13 of the joint section 5 that communicate with them in the lateral direction perpendicular to the length direction of the cross member 2.

As described above, the connecting fittings of this embodiment are U-shaped or C-shaped in plan view, and a pair of the connecting protruding plate parts 7 are integrally formed facing the connecting base part 4, and are configured to have vertical dimensions (relatively small size) that allow multiple (required number) to be arranged side by side in the vertical direction according to the vertical dimension (beam length) of the cross member 2.

In other words, instead of having to prepare three different types of fastening fittings (large, medium and small) according to the beam length, the required number of small fastening fittings can be attached and fixed in parallel in the vertical direction of the column 1, making construction easier and allowing the fastening strength to be maintained even with such divided fittings.

Because the area of contact between the metal fittings and the column 1 is relatively small, when a shear force is applied to each metal fitting from above or below, a large force that tries to rotate the metal fittings may be generated starting from the fixing device 3. This causes the large horizontal secondary stress mentioned above, especially in the upper and lower drift pins 6 at the tip end. In order to counteract this and suppress the secondary stress, in this embodiment, locking sections 9 and 10 are provided at the upper and lower ends of the base side of the connecting protrusion plate section 7, and when the metal fittings are installed side by side, they can be installed side by side in a locked state (interlocking state) by these locking sections, and a structure is created that can lock against the force that tries to rotate.

Specifically, in this embodiment, an upper locking portion 9 is provided on the upper base side of the connecting protrusion plate portion 7, which is closer to the connecting base plate portion 4, and a lower locking portion 10 that locks to the upper locking portion 9 of another connecting metal fitting that is arranged vertically side by side is provided on the lower base side of the connecting protrusion plate portion 7, which is vertically opposite to the upper locking portion 9, closer to the connecting base plate portion 4.

In other words, when other present connecting fittings are arranged side by side in the vertical direction, the side of the upper locking portion 9 of the other present connecting fitting and the side of the lower locking portion 10 of the present connecting fitting are arranged side by side in the protruding direction of the connecting protruding plate portion 7, so that the side that is part of the upper locking portion 9 (for example, the outer surface of the tip of the connecting protruding plate portion 7 if it is an engaging protrusion) butts against the side that is part of the lower locking portion 10 (for example, the inner surface of the tip of the connecting protruding plate portion 7 if it is an engaging recess) and are configured to be in an abutting and locked state when deformed.

To explain more specifically, the upper locking portion 9 and the lower locking portion 10 are integrally formed on the plate edge portion of the connecting protruding plate portion 7 near the connecting base plate portion 4, and further, in this embodiment, the upper locking portion 9 is integrally formed as a plate-shaped locking protrusion that protrudes upward from the upper edge, and the lower locking portion 10 is integrally formed as a locking recess in the lower edge.

In other words, in this embodiment, a plate-shaped locking protrusion is integrally formed as the upper locking portion 9 on the upper edge of each connecting protrusion plate portion 7 near the base end portion close to the connecting base plate portion 4, and a notched locking recess is integrally formed as the lower locking portion 10 on the lower edge portion near the base end portion opposite the upper and lower ends thereof, and the locking protrusion and locking recess are arranged to interlock with each other, so that the butt sides of the locking protrusion and locking recess in the beam length direction (the outer surface of the tip end side of the connecting protrusion plate portion 7 of the locking protrusion and the inner surface of the tip end side of the connecting protrusion plate portion 7 of the locking recess) are locked together.

Therefore, when the metal fittings are subjected to a shear force that causes them to rotate downward and deform, the locking protrusions are received by the locking recesses, and they butt against each other to resist the force of deformation. This configuration suppresses secondary stresses in each drift pin 6 and prevents a decrease in joint rigidity due to rotation of the metal fittings, thereby maintaining shear strength.

Therefore, when a downward shear force is applied to the beam 2 from above, even if a force is generated in each of the joint fittings that tends to rotate downward, generating secondary stress in the longitudinal direction of the beam 2, this is received by the engagement between the upper retaining portion 9 and the lower retaining portion 10, and the force that tends to rotate is resisted. As a result, the secondary stress generated in the drift pin 6 is suppressed, and the number of drift pins 6 that generate secondary stress does not increase, resulting in a joint configuration in which the shear resistance is not reduced.

In other words, instead of having to prepare multiple types of connecting fittings with different vertical dimensions according to the beam configuration, simply lining up the required number of these connecting fittings, which have relatively small vertical dimensions, on the column 1 according to the beam configuration makes construction easier and ensures sufficient connecting strength.

Furthermore, as mentioned above, the vertical dimensions of each of these metal joints are relatively small, so they are able to resist the large rotational forces that tend to occur, thereby suppressing the secondary stresses that occur in the drift pin 6, and also suppressing the decrease in joint rigidity due to rotation, which makes it difficult for the shear strength to decrease. Furthermore, this can be achieved with a simple structure, making these metal joints extremely practical.

In addition, in this embodiment, the locking structure of the upper locking portion 9 and the lower locking portion 10 is an interlocking structure of an integrally formed locking protrusion and an integrally formed notch-like recess, so it is easy to manufacture, does not require high costs, and is excellent for mass production.In addition, since it is only necessary to align them side by side so that they interlock (engage), it is also easy to install, making it an extremely practical configuration.

In addition, because this locking structure (upper locking portion 9 and lower locking portion 10) is located closer to the connecting base portion 4, the locking structure is located at a position where deformation displacement is small, making it easier to maintain this locked state (this lock is less likely to come off even if it is deformed), resulting in an even more excellent configuration.

In this embodiment, the connecting base plate 4 is provided with a positioning protrusion 12 that engages with the positioning recess 11 of the column 1, allowing the metal fittings to be easily positioned side-by-side, resulting in a configuration with even greater ease of construction. Furthermore, because the column 1 is connected to this positioning protrusion 12 and the fastener 3, even a single fastener 3 fastener has a rotation prevention effect, which prevents the beam 2 from tipping over when the worker stands on it, thus preventing the worker from falling.

In addition, the fixing bolts of the fixing device 3 are inserted through a selected one of the multiple column mounting through holes 14 provided below the positioning protrusion 12. For example, when joining two beams 2 to two different sides of a column 1, the joining hardware is attached to the two sides with the fixing device 3. In this case, the positioning protrusion 12 is engaged with the positioning recess 11 and attached in a predetermined position on the column 1, and one of the column mounting through holes 14 on the connecting base plate 4 is selected and the fixing bolt is inserted through it to fix the column 1. This makes it easy to install the fixing bolts without cross interference, resulting in a configuration with even better workability.

If the upper and lower locking parts 9 and 10 are configured to be able to be locked and connected in advance, they can be attached and fixed to the pillar 1 with the fasteners 3 as described above in a multiple-connected, integrated state, making for even easier installation. In this way, the configuration of the locking parts (locking structure) can be designed as appropriate.

The present invention is not limited to this embodiment, and the specific configuration of each of the other components of the locking structure can be designed as appropriate.

Reference Signs List 1 Column 2 Cross member 3 Fixing device 4 Connection base plate portion 5 Joint portion 6 Connection device 7 Connection protruding plate portion 8 Connection hole 9 Upper locking portion
10 Lower stop
11 Positioning recess
12 Positioning protrusion
13 Beam through hole
14 Pole mounting hole
15 Column through hole

Claims (5)

A metal fitting for construction that connects a pillar or a horizontal member to a horizontal member that is joined by butting the ends of the pillar or horizontal member,
The connecting base plate portion is fixed to the column or the cross member by a fastener, and a connecting protruding plate portion is disposed at the joint of the cross member where the ends are butt-joined, and is connected to the cross member by a connector inserted through the joint,
The connecting protruding plate portion disposed at the joint portion of the end portion of the cross member and connected by the connecting device has one or more hole-shaped or notched connecting holes through which the connecting device passes in the vertical direction,
An upper locking portion is provided on the upper portion of the base side of the connecting protruding plate portion disposed at the joint portion of the cross member, the upper locking portion being closer to the connecting base plate portion,
A lower locking portion that locks onto the upper locking portion of another architectural fastening metal fitting to be arranged vertically in parallel is provided on the lower portion of the base side of the connecting protruding plate portion, which is vertically opposite to the upper locking portion, and is closer to the connecting base plate portion.
This architectural fastening fitting is characterized in that, when the other architectural fastening fittings are arranged side by side in the vertical direction, the side portions of the upper engaging portion and the lower engaging portion of the other architectural fastening fittings are arranged side by side in the protruding direction of the connecting protruding plate portion, and when the side portions of the upper engaging portion and the side portions of the lower engaging portion abut against each other or deform, they form an abutting and engaging state to resist a force that attempts to rotate the architectural fastening fittings and the other architectural fastening fittings arranged side by side in the vertical direction in the vertical direction. 2. The fastening hardware for architecture according to claim 1, wherein the upper and lower locking portions are integrally formed with a plate edge portion of the connecting protrusion plate portion closer to the connecting base portion. 3. The architectural fastening hardware according to claim 2, characterized in that one of the upper and lower locking portions is a locking convex portion integrally protruding and formed on the plate edge portion of the connecting protrusion plate portion near the connecting base portion, and the other is a locking concave portion integrally formed as a recess, and is configured to resist a force that attempts to rotate the architectural fastening hardware and the other architectural fastening hardware arranged side by side in the vertical direction in the vertical direction by forming an abutting and locking state when the outer portion of the locking convex portion, which is the upper locking portion or the lower locking portion, and the inner portion of the locking concave portion, which is the lower locking portion or the upper locking portion, abut against or deform. The architectural fastener described in any one of claims 1 to 3 is configured to be U-shaped in plan view, and a pair of the connecting protruding plate parts are integrally formed facing each other on the left and right sides of the connecting base part. 2. The architectural fastening hardware according to claim 1, characterized in that the connecting protrusion plate portion is arranged at the joint portion and has vertical dimensions set so that multiple connecting members are arranged side by side in the vertical direction in accordance with the vertical dimensions of the cross members to be connected by the connecting device inserted through this joint portion.