JPH0791003A - Connecting structure - Google Patents

Abstract

PURPOSE:To prevent a floor slab from being destructed even if the maximum (interlayer) displacement is produced by a horizontal load at large earthquake, etc., at different cycles. CONSTITUTION:A setting base 22 is buried in a floor slab 12. Also a slide nut 26 is screwed onto the end of an anchor bolt 24 inserted into a cylindrical body 16. The anchor bolt 24 is set so that it can be moved within the range of slide width D1, and inserted into the cylindrical body 16 with the base 22B of the setting base 22 held between the anchor bolt 24 and the cylindrical body 16. The floor slab 12 is connected to a wall 14 through the setting base 22 and a horizontal load acts on the connecting part of the floor slab 12 and wall 14 at a big earthquake to prevent the floor slab 12 from slipping from a cogging wall 32 even if it is displaced at different cycles.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention partially uses a PC member for a construction method such as a tough type short-period building in which a displacement occurs at the time of an earthquake and a structure in which a local displacement is expected. This is especially effective when used to connect each member in a building, and horizontal loads are applied during a large earthquake, etc., resulting in a building with a high eccentricity ratio, a rigid floor assumption collapsed due to local destruction, etc. The present invention relates to a connection structure that prevents a PC member from dropping without being destroyed even if it occurs in each part and does not behave in the same cycle.

[0002]

2. Description of the Related Art As shown in FIG. 5, a jaw wall 54 is provided on the wall 52 at the connecting portion of the floor slab 50 for stair landings and the wall 52, and the tip of the floor slab 50 is placed on the wall 52. The jaw wall 54 projects from the surface of the wall 52 by a width D2. This width D2 is set to be larger than the maximum (inter-layer) displacement amount due to the horizontal load that the building receives during a large earthquake, and even when a horizontal load during a large earthquake acts on the connecting portion between the floor slab 50 and the wall 52, The floor slab 50 is configured so as not to slide off the jaw wall 54.

A setting base 56 is embedded in the tip of the floor slab 50, and similarly, the jaw wall 5 is formed.
The setting base 58 is also embedded in the wall 52 in the vicinity of 4. The setting base 56 and the setting base 58 are welded together via a plate 60.

[0004]

However, when a horizontal load is applied to the connecting portion of the floor slab 50 and the wall 52 during a large earthquake, a maximum displacement occurs between the floor slab 50 and the wall 52, which causes the floor slab 50 to move. Even if it does not slide off from the wall 54, the welded portions of the setting bases 56, 58 and the plate 60 may be broken. Therefore, even if the entire staircase is not destroyed, the setting base 5
If 6, 58 and the plate 60 are not repaired, the stairs may not be used for safety.

In view of the above facts, it is an object of the present invention to provide a connecting structure which is not destroyed even by maximum (interlayer) displacement due to horizontal load such as during a large earthquake.

[0006]

A connecting structure according to claim 1, wherein a first member, a second member connected to the first member, and a tubular body embedded in the first member, One end is inserted into the cylindrical body and is slidable along the axial direction within a predetermined range in the cylindrical body, and the other end is an anchor bolt fixed to the second member.

According to a second aspect of the present invention, there is provided a connecting structure comprising a first member used for a building and a second member connected to the first member.
A member, a support portion provided on the first member and supporting the second member, and a tubular body embedded in the first member,
An anchor bolt, one end of which is inserted into the cylindrical body and is slidable along an axial direction within a predetermined range within the cylindrical body, and the other end of which is fixed to the second member. The movable range in the cylinder is set to be larger than the maximum (interlayer) displacement amount due to the horizontal load applied to the building during a large earthquake.

According to a third aspect of the present invention, in the connecting structure according to the first or second aspect, the connecting member has an L-shaped cross section in which the first member and the second member are provided in the supporting portion. The anchor bolt fixes the setting base to the first member while being joined via the setting base.

According to a fourth aspect of the present invention, there is provided the connection structure according to any one of the first to third aspects,
It is characterized in that the anchor bolt is fixed to the bottom portion of the tubular body by a locking means that releases the locking when a predetermined load is applied.

According to a fifth aspect of the present invention, in the connecting structure according to any one of the first to fourth aspects,
It is characterized in that a retaining means is provided for preventing the tubular body from coming out of the first member.

[0011]

According to the connecting structure of the first aspect, when a force acts on the connecting portion of the first member and the second member, the first member and the second member are connected.
The member is displaced and a gap is created between the two. At this time, the second
The anchor bolt inserted into the first member also moves along the axial direction within a predetermined range in response to the displacement of the member.
As a result, the connected state of the first member and the second member can be maintained without being destroyed.

Further, according to the connecting structure of the second aspect, when a horizontal force such as an earthquake force acts on the connecting portion between the first member and the second member, the first member and the second member are displaced and both There is a gap between them. At this time, when the second member is displaced in the axial direction of the anchor bolt, the anchor bolt also moves within the predetermined range along the axial direction corresponding to this displacement. Here, since the range in which the anchor bolt can move within the cylinder is set to be larger than the maximum (inter-layer) displacement amount due to the horizontal load that the building receives during a large earthquake, the second member was supported by the support portion. State is retained.

As a result, the connecting portion between the first member and the second member is not destroyed even after the vibration such as an earthquake is damped, so that the first member and the second member can be re-established without a large-scale repair. Members can be used.

According to the connecting structure of claim 3, the first structure
The member and the second member are joined via the setting base. The anchor bolt fixes the setting base to the first member. Therefore, the first and second
When the member is displaced in the axial direction of the anchor bolt, the anchor bolt fixing the setting base can also move along the axial direction within a predetermined range in response to this displacement, so that the first member and the first member Even if a horizontal load acts on the two members at the time of a large earthquake, the connected state of the first member and the second member can be maintained.

According to the connecting structure of the fourth aspect, the end of the anchor bolt is fixed to the bottom of the cylinder by the locking means. The locking means releases the locking when a predetermined load is applied. As a result, in normal times, the first member and the second member are securely connected, and when a predetermined load acts, the locking of the locking means is released, and the anchor bolt is axially moved within a predetermined range. You can move along.

According to the connecting structure of the fifth aspect, since the tubular body is provided with the retaining means, it is possible to prevent the tubular body from coming out of the first member.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a connected state of a landing floor slab 12 for stairs and a wall 14 to which a connecting structure 10 according to the first embodiment is applied. A tubular body 16 is embedded in the wall 14. The bottom of the cylindrical body 16 is the plate 21.
And is configured to prevent the barrel 16 from slipping out of the wall 14. Also, floor slab 1
A setting base 22 having an L-shaped cross section is embedded at the tip of 2. The setting base 22 has a base 22A and a base 22B joined together by welding. The combination of the tubular body 16 and the flange 20 and the setting base 22 may be integrally molded.

An anchor bolt 24 is inserted in the cylindrical body 16. A slide nut 26 is screwed onto the end of the anchor bolt 24. The anchor bolt 24 has a step 28 formed near the opening of the tubular body 16.
Slide width D1 until the slide nut 26 comes into contact with
Within the range, it is configured to be movable along the axial direction of the anchor bolt 24 (direction of arrow A). The anchor bolt 24 and the slide nut 26 may be integrally formed, or a part of the anchor bolt 24 may be expanded in diameter to form a portion having the same function as the slide nut 26. In addition, the slide nut 26 and the cap 2
It is also possible to mount a spring and an elastic body such as rubber between 0 and the step 28 to increase resistance and increase the damping rate of the vibration damping system. Further, the inside of the cylindrical body 16 may be filled with grease.

The anchor bolt 24 has a cylindrical body 16 with the base 22B of the setting base 22 interposed therebetween.
It is inserted inside and is embedded with the mortar that constitutes the jaw wall 32. As a result, the floor slab 12 and the wall 14 are connected via the setting base 22. At this time, the floor slab 12 is placed within the range of the width D2 of the upper surface of the jaw wall 32. This width D2 is set to be larger than the maximum (inter-story) displacement amount due to the horizontal load that the building receives during a large earthquake, and even if a horizontal load during a large earthquake acts on the connecting portion of the floor slab 12 and the wall 14, The floor slab 12 is configured so as not to slide off the jaw wall 32. The slide width D1 is set larger than the width D2.

The maximum (inter-story) displacement due to horizontal load during a large earthquake varies depending on the structural type of the building and the height above the ground, but as an example, for a reinforced concrete structure or a reinforced concrete structure with a large number of walls, 10 If it is a floor, it will be about 70 mm.

Next, the operation of the connecting structure 10 according to the first embodiment will be described. When horizontal force such as seismic force acts on the connection between the landing floor slab 12 for stairs and the wall 14 to which the connection structure 10 according to the first embodiment is applied, the floor slab 12 and the wall 14 are applied.
Is displaced, and a gap is created between the floor slab 12 and the wall 14. By the way, since the width D2 of the jaw wall 32 is set to be larger than the maximum (interlayer) displacement amount due to the horizontal load applied to the building at the time of a large earthquake, the floor slab 12 does not slip off the jaw wall 32. At this time, the floor slab 12 is displaced in the horizontal direction (direction of arrow A), and the anchor bolt 24 inserted into the tubular body 16 on the wall 14 side in correspondence with the displacement of the floor slab 12 is also within the range of the slide width D1. It moves along the axial direction (arrow A direction).

Thus, the connecting structure 1 according to the first embodiment.
According to 0, there is no danger of breaking even after vibration such as an earthquake is attenuated unlike the conventional fixing tool, so it can be used again as a staircase and a landing of stairs without major repairs. .

FIG. 2 shows a connecting structure 40 according to the second embodiment.
The connecting state of the landing floor slab 12 and the wall 14 of the staircase to which the above is applied is shown. In addition, in FIG. 2, portions corresponding to those in FIG.

The outer peripheral surface of the cylindrical body 16 has an axial direction (arrow A).
A plurality of annular projections 18 are formed at predetermined intervals in the direction) to prevent the tubular body 16 from coming out of the wall 14. In addition, the bottom of the cylindrical body 16 has a cap 20.
Is sealed by. The cylindrical body 16 and the cap 20 may be integrally molded.

A waterproof rubber 30 is provided near the step 28 along the circumferential direction of the anchor bolt 24, if necessary, to prevent water from entering the inside of the cylindrical body 16. ing.

On the other hand, the other end of the anchor bolt 24 is inserted into the floor slab 12 with its tip bent in a direction orthogonal to the axial direction (direction of arrow A), and the tip of the anchor bolt 24 comes out of the floor slab 12. It is configured to prevent. The tip of the floor slab 12 is placed within the range of the width D2 of the upper surface of the jaw wall 32 formed on the wall 14. Other configurations, functions and effects are similar to those of the first embodiment described above.

As shown in FIG. 3, the end of the anchor bolt 24 may be fixed to the cap 20 by the mounting bolt 34. The mounting bolt 34 is made of a material that is destroyed when a predetermined load (2000 kg / 1 bolt, for example) is applied. As a result, the floor slab 12 and the wall 15 are reliably connected at normal times, and when a predetermined load, for example, a horizontal load at the time of a small or medium earthquake, acts from the horizontal direction (direction of arrow A), the mounting bolt 34 is The anchor bolt 24 is broken and can move along the axial direction (direction of arrow A) within the range of the slide width D1. Instead of the mounting bolt 34, the anchor bolt 2
Other locking means such as a shear pin, a spring, a hook, a click, a plastically deformable member, and a friction member that locks the movement of 4 under a predetermined load or less can be applied.

Since the vertical force is known to be 1/2 to 1/3 of the horizontal load at the time of a large earthquake from the seismic motion analysis, the shear strength of the anchor bolt 24 and the jaw wall 32.
Confirm that the concrete shear strength of is more than the above load.

On the other hand, as shown in FIG. 4, on the outer peripheral surface in the vicinity of the bottom portion of the cylindrical body 16, a knitting muscle 36 is attached in a direction orthogonal to the axial direction (direction of arrow A) of the cylindrical body 16, or the cylindrical body 1
A flange may be provided on the outer peripheral surface of 6. by this,
It is possible to prevent the tubular body 16 from coming out of the wall 14. In FIGS. 3 and 4, members that are basically the same as those in FIG. 2 are assigned the same reference numerals and explanations thereof are omitted.

Further, in the above embodiment, the cylindrical body 16 is attached to the wall 1.
Although it is configured to be embedded in the 4 side, the configuration is not limited to this, and the configuration in which the cylindrical body 16 is embedded in the floor slab 12 side may be converse to the above embodiment. Further, in the above embodiment, the connecting structure 10 according to the present invention is applied to the connecting portion between the landing floor slab 12 and the wall 14 of the stairs, but the present invention is not limited to this, and for connecting the stairs and the handrail, for example. , May be applied to other parts of the building such as for connecting the building and the slab.

[0031]

As described above, since the connecting structure according to the present invention has the above-mentioned structure, it is not destroyed even if an irregular displacement occurs due to horizontal load or the like during a large earthquake. .

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a connected state of a landing floor slab on a staircase and a wall to which a connecting structure according to a first embodiment is applied.

FIG. 2 is a vertical cross-sectional view showing a connected state of a landing floor slab on a staircase and a wall to which the connecting structure according to the second embodiment is applied.

FIG. 3 is a vertical cross-sectional view showing a state in which an end portion of an anchor bolt is fixed to a cap by a mounting bolt.

FIG. 4 is a vertical cross-sectional view showing a state in which a knitting muscle is attached to a tubular body.

FIG. 5 is a vertical cross-sectional view showing a connecting portion between a conventional floor slab for stairs landing and a wall.

[Explanation of symbols]

 10 Connection Structure 12 Floor Slab (Second Member) 14 Wall (First Member) 16 Cylindrical Body 18 Annular Convex Part (Prevention Means) 21 Plate (Prevention Means) 22 Setting Base 24 Anchor Bolt 32 Jaw Wall (Support) 34 Installation Bolt (locking means) 36 Knee muscle (prevention means) 40 Connection structure

Claims (5)

[Claims] 1. A first member, a second member connected to the first member, a cylinder body embedded in the first member, and one end of which is inserted into the cylinder body and has a predetermined shape. An anchor bolt slidable in the axial direction within the range and having the other end fixed to the second member. 2. A first member used for a building, a second member connected to the first member, a support portion provided on the first member for supporting the second member, A tubular body embedded in one member, one end of which is inserted into the tubular body and is slidable along an axial direction within a predetermined range in the tubular body, and the other end is fixed to the second member. An anchor bolt, and a connection in which the movable range of the anchor bolt in the cylinder is set to be larger than a maximum (inter-layer) displacement amount due to a horizontal load received by a building during a large earthquake. Construction. 3. The first member and the second member are joined together via a setting base having an L-shaped cross section provided in the support portion, and the anchor bolts connect the setting base to the first member. It is fixed to the connection structure according to claim 1 or 2. 4. The anchor bolt is fixed to the bottom portion of the tubular body by a locking means that releases the locking when a predetermined load acts on the anchor bolt. The connection structure according to item 1. 5. The connecting structure according to claim 1, further comprising a retaining means for preventing the tubular body from coming out of the first member.