JP4628491B1 - Structure joining structure and fixing device for joining structures used therein - Google Patents

Abstract

[PROBLEMS] To provide two structures (main structure and additional structure) that can behave independently of each other when a horizontal force is applied, such as an existing concrete structure and a new concrete structure constructed in contact therewith. Joining to a state in which relative rotational deformation is allowed around the rotation axis in the horizontal direction while transmitting the horizontal shearing force between them.
A fixing device 3 is installed across a main structure 1 and an additional structure 2 that can behave independently of each other when a horizontal force is applied. The fixing member 4 that is disposed across the boundary between the main structure 1 and the additional structure 2 and has a through hole 42a partially penetrating in the thickness direction, and penetrates the fixing member 4 into both the structures 1 and 2. The fixing device 3 is composed of the anchor 5 which is fixed and bendable.
The fixing member 4 has a fixing portion 41 fixed to one of the main structure 1 and the additional structure 2, and a main body portion 42 fixed to the other and having a convex surface on the side, The structure 2 can be relatively rotationally deformed along the surface of the main body 42.
[Selection] Figure 1

Description

  The present invention includes, for example, an existing concrete structure and a new concrete structure constructed in contact with the structure, or a structure that is the main body of the structure and a structure that is additionally constructed in contact with the structure. A joint structure joined to a state allowing relative rotational deformation while transmitting a horizontal shear force between two structures that can behave independently of each other due to a difference in horizontal force, and the like. The present invention relates to a fixing device used.

  For example, when constructing a new concrete structure in contact with the surface of an existing concrete structure, the existing structure (additional structure) is installed so that shear force is transmitted between the two structures. It is necessary to join the body (main structure) (see Patent Documents 1 and 2). For example, when the additional structure (new structure) is a slab and is joined to the main structure (old structure) at the end face, the additional structure reinforces the main structure against the horizontal force during an earthquake. Since it is integrated into the main structure for the purpose, the main structure is transmitted between both structures so that a shearing force in the horizontal direction perpendicular to the direction in which both structures oppose each other (parallel to the opposing surface) is transmitted. Must be joined to.

  Joining both structures so that a horizontal shearing force (horizontal shearing force) is transmitted between the two structures is mainly achieved by anchors such as anchor bolts on the surface side of the main structure (old structure). It is ensured by fixing the shearing force transmission member fixed to the structure in a state of protruding to the additional structure (new structure) (see Patent Documents 1 and 2).

  If the additional structure (new structure) will be spliced at the time of construction of the main structure (old structure) and the shear force transmission member can be embedded in advance at the time of construction of the main structure, When the main structure is completed, the shear force transmitting member can be embedded in a portion near the surface of the main structure. On the other hand, if there is no plan to splice the additional structure on the surface of the main structure, there is no necessity to embed a shear force transmission member near the surface of the main structure. It is necessary to embed a shearing force transmission member.

Japanese Patent No. 4038472 (paragraphs 0067 and 0080, FIGS. 11 and 12) Japanese Patent No. 4230533 (paragraphs 0081 to 0083, FIGS. 6 and 7)

  On the other hand, for example, when the additional structure (new structure) and the main structure (old structure) behave independently of each other when a horizontal force is applied due to differences in bending rigidity (natural frequency), The additional structure is forcibly deformed in such a way that it follows (drags) the deformation of the main structure, but when both structures are deformed, a relative rotational deformation occurs between the opposing faces of each housing. Will be able to.

  The deformation of the additional structure by following the deformation of the main structure occurs when the main structure is bent and deformed in the direction in which the main structure and the additional structure face each other. Relative rotational deformation occurs about a horizontal axis parallel to the surface (in-plane direction) where the main structure and the additional structure face each other.

  From the above, it is necessary that the main structure and the additional structure be joined in a state in which rotational deformation around a horizontal axis parallel to the opposed surfaces of both is allowed. If rotational deformation is not allowed, the joint between both structures will be damaged.

  From the above background, the present invention allows relative rotational deformation between the two structures while transmitting a horizontal shear force between the two structures using a shear force transmission member (anchor) straddling the main structure and the additional structure. The present invention proposes a joint structure in which both structures are joined to each other and a fixing device used in the structure.

According to the first aspect of the present invention, there is provided a bonding structure in which a fixing device is installed between a main structure and an additional structure that can behave independently of each other when a horizontal force is applied. It is a joint structure joined so that relative displacement is possible,
The fixing device is disposed across the boundary between the main structure and the additional structure, and has a fixing member having an insertion hole that partially penetrates in the axial direction, and is fixed to both structures through the fixing member. And an anchor capable of bending deformation,
The fixing member is installed across the main structure and the additional structure, is fixed to one of the main structure and the additional structure, is fixed to the other, and the surface on the side is fixed. has a body portion which is formed in the shape of convex, Ri relative rotation deformable der structure that side is relative to the fixing member along the surface of the body portion,
The fixing device includes a plurality of fixing devices arranged in a direction orthogonal to a direction in which the main structure and the additional structure face each other.

  “The surface of the main body portion on the other structure side is formed in a convex shape” means that the surface side is formed in a three-dimensional shape that is convex, and the three-dimensional shape is a straight line around the axis of the main body portion. In addition to curved surface shapes such as a rotating body shape formed by rotating a curve, a polyhedral shape close to that is included. Further, for example, as shown in FIG. 10, the surface of the main body part may have a part having a three-dimensional shape such as a curved surface shape or a polyhedron shape, at least a part passing through the center part (insertion hole) of the main body part.

  For the main structure and the additional structure to behave independently of each other when a horizontal force is applied, for example, there is a difference in the bending rigidity between the main structure and the additional structure, and the difference in natural frequency due to the difference in bending rigidity. Due to the independent behavior (vibration) and bending deformation, there is no difference in bending rigidity and relative bending at the joint of the main structure and additional structure while bending deformation is uniform. Deformation may occur.

  For example, when two structures with the same bending rigidity are adjacent to each other, if both structures are bent and deformed uniformly, both structures are bent and deformed even between parts located at the same level in the state before the deformation. Because of this, a level difference (step) is generated, so that relative rotational deformation occurs even when there is no difference in bending rigidity between the two structures.

  The structure is mainly a part of a reinforced concrete structure, but may be unreinforced concrete or mortar. For example, the main structure refers to an existing concrete structure, and the additional structure refers to a concrete structure that is additionally (newly) constructed in contact with the surface of the existing concrete structure. The structure includes both building structures and civil engineering structures, and includes bridge girders, bridge piers, footings, etc. in addition to building columns, beams, slabs, foundations, and the like.

  The joint part of the main structure and the additional structure is not limited, for example, old and new slabs, beams (girder), columns, foundations, etc., or any combination of these depending on the construction position of the additional structure, etc. become. When the additional structure has the role of seismic (damping) reinforcement for the main structure, it is constructed with the slab or beam of the additional structure joined to the surface of any part of the main structure .

  Regardless of the timing of the construction of the additional structure to the main structure, the construction of the main structure is also possible in addition to the construction of the additional structure immediately after the construction of the main structure, such as the joining of the main structure and the additional structure. Is completed, and it becomes necessary to reinforce the main structure during the period of use.

  The fixing member is composed of a fixing part fixed to one of the main structure and the additional structure, and a main part fixed to the other, and the fixing member is fixed in the axial direction as a whole. A three-dimensional shape in which the main body part opposite to the part is convex.

  The fixing unit is formed (protruded) continuously or intermittently in the circumferential direction around the main body or at a position near the periphery, and is formed in an annular shape as a whole. In order to disperse the load throughout the fixing unit when any portion of the fixing unit bears a shearing force, the fixing unit is continuously formed. “Intermittently forming” means that the depth of the fixing portion changes in the circumferential direction as in the case where the fixing portion is formed in a wave shape.

  The fixing member is installed across the main structure and the additional structure, and the fixing portion which is one end portion in the direction in which both structures face each other (the axial direction of the fixing member) is either the main structure or the additional structure. Either the main structure or the additional structure is fixed, and the main body, which is the other end, is fixed to the other of the main structure and the additional structure (the additional structure or the main structure). The

  By fixing the fixing part and the main body part to the structure on each side, the contact surface (boundary surface) of both one structure (main structure) and the other structure (additional structure) at the time of the earthquake When a horizontal relative displacement (displacement deformation) parallel to the contact surface (the surface where both structures face each other) is about to occur in a parallel state, the fixing member is fixed to both structures (additional structure and main structure). Transmits horizontal shear force between structures).

  When the fixing member is viewed in a direction orthogonal to the axial direction, as shown in FIG. 9, the fixing member has a shape (three-dimensional shape) having an equivalent length (projection area) in two directions (horizontal direction and vertical direction). If the shape has no directivity in the direction orthogonal to the axial direction, the shearing force in the vertical direction can be transmitted. However, when one structure (main structure) and the other structure (additional structure) behave independently, the fixing member is relatively rotated around the horizontal axis between the opposing surfaces of both structures. In order to exhibit the function of generating, a shape that does not hinder the relative rotational deformation of both structures is formed.

  “A shape that does not hinder the relative rotational deformation of both structures” means that the fixing portion of the fixing member is fixed to the structure on the side as shown in FIGS. 1- (a) and (b). That is, the structure on the main body side has a shape that can be rotationally deformed relative to the structure on the fixing portion side along the surface of the main body having a convex shape. Since the rotation is relative between the main structure and the additional structure, the magnitude of the absolute rotation angle from the state before the rotational deformation of each structure is not limited.

  “Rotating deformation along the surface of the main body” means, for example, parallel to the contact surface of one structure (main structure) and the other structure (additional structure) as shown in FIG. 6 (a) and 6 (b), the surface on the other structure (additional structure) side of the main body is convex as shown in FIGS. In the case of a curved surface, the other structure (additional structure) rotates along the surface of the main body portion with respect to one structure (main structure) so as to cause slippage.

  By having a fixing portion where the fixing member is fixed to one structure and a main body having a convex shape on the other structure side, relative rotational deformation between the main structure and the additional structure may occur. In this case, there is a higher possibility that the main body portion tends to rotate and deform relative to the structure on the side than the possibility that the fixing portion tends to rotate and deform relative to the structure on the side. Due to the difference in possibility, the fixing member maintains a state where the fixing member is fixed to one structure in the fixing portion and tries to move relative to the other structure in the main body portion.

  As a result, a naturally occurring state can be obtained without inhibiting relative rotational deformation between the main structure and the additional structure, so that the main structure and additional structure due to forced rotational deformation are obtained. Damage at the joints in between is avoided or suppressed in advance.

  As described above, the fixing member transmits a horizontal shearing force in a direction perpendicular to the opposing direction between the main structure and the additional structure, and allows relative rotational deformation of both structures around the horizontal axis in the direction. By doing so, the function of pin-bonding the main structure and the additional structure to the bending moment about the horizontal axis is exhibited.

  Due to the shape of the surface of the main body of the fixing member, the relative rotation deformation between the main structure and the additional structure is likely to occur, so that one structure (main structure) and the other structure (additional) When the structure) vibrates independently due to seismic force or wind load and is about to undergo relative rotational deformation, there is a gap between the opposing surfaces of both structures as shown in FIGS. When a bending moment around the horizontal axis acts on the skin, skin separation tends to occur, and relative rotation around the horizontal axis occurs. This rotation occurs alternately in positive and negative directions.

  At this time, in order for the fixing member to prevent the relative rotational deformation between the main structure and the additional structure and prevent the rotational deformation positively, the fixing member has both the main structure and the additional structure. It is better not to maintain the state straddling the structure, and as shown in FIG. 6, the fixing portion of the fixing member is fixed to one of the main structure and the additional structure, and the other structure is maintained. Suitably, the body is in a state of being able to rotate and deform with respect to the main body along the surface of the main body.

  Therefore, the surface of the main body fixed to the other structure is formed in a convex curved shape on the structure side, so that when the two structures are about to undergo relative rotational deformation, A state is obtained in which the structure can be rotationally deformed with respect to the main body along the surface of the main body. Specifically, “curved surface” means that the main body of the fixing member has an elliptic paraboloid such as a bowl or other curved surface, or a polyhedral shape, etc. Corresponds to the cutting (separation) of the edge between the structure on the main body side and the surface of the main body. The above “separation of skin” occurs as a result of the edge between the structure on the main body portion side and the main body surface being cut and rotating.

  For example, as shown in FIG. 1- (a), when the fixing unit is fixed to the main structure and the main body is fixed to the additional structure, the fixing member is installed across the two structures. If it is assumed that when the structure is about to undergo relative rotational deformation, skin separation occurs between the end surfaces (contact surfaces) of the main structure and the additional structure, in the example of FIG. The additional structure, which is a structure on the side having a smaller thickness or thickness), tries to rotate about the lower end or upper end of the end face on the main structure side as the center of rotation. Rotation of the additional structure around the lower end of the main structure side end surface and rotation around the upper end occur alternately. The rotational center of relative rotational deformation of both structures is also the center of bending when the anchor that passes through the fixing member causes bending deformation.

  Thus, when the main structure and the additional structure are relatively rotationally deformed, the structure on the side having a relatively small height (composition (thickness)) has the lower end and the upper end as rotation centers, and the other structure. Try to rotate with respect to the body. Therefore, regardless of which side the main body is fixed to the structure on which side, as shown in FIG. 1- (b), the surface of the main body is a horizontal surface orthogonal to the direction in which the main structure and the additional structure face each other. When viewed in the direction (direction of the rotation center (rotation axis) of relative rotational deformation), the arc shape is centered on the lower end and upper end of the structure with the smaller height (composition or thickness), or It is reasonable to form in a close shape (Claim 2).

  Since it is “when viewed in the direction of the rotation center (rotation axis)”, as shown in FIG. 9, “arc shape or a shape close to it” is a shape of a rotating body formed by rotating a curve around the axis of the fixing member. In addition to the case of a three-dimensional shape such as the one shown in FIG. 10 and a case where a part of the three-dimensional shape is included as shown in FIG. An arc shape or a shape close to it may be drawn.

  “Arc shape centered on the lower end and the upper end of the structure on the small height side” means that the upper half of the outline line with respect to the axial center line of the fixing member has a height as shown in FIG. Draw an arc centered at the lower end of the opposing structure side surface, or a curve or polygon close to it, and the lower half of the outer structure is an arc centered at the upper end or close to it Say to draw curves and polygons.

  The main body portion of the fixing member only needs to function to transmit the horizontal shearing force in the direction orthogonal to the direction in which both structures oppose while allowing the relative rotational deformation of both structures. It is formed in an arc shape centering on the lower end and upper end of the structure on the side where the height (composition or thickness) is small, as long as it is parallel to the axis of relative rotation. It is not always necessary to form a three-dimensional shape such as an arc (rotary body shape). FIG. 9 shows an example in which the main body has a rotating body shape, but FIG. 10 shows an outer shape of the arc when viewed in the axial direction (horizontal direction) of rotation, and is seen in a plane. In some cases, the main body portion excluding the fixing portion has a T-shape.

  An insertion hole is formed in the central portion when the fixing member is viewed in the axial direction and penetrates the main body portion in the axial direction and is fixed to both structures. The insertion hole supplements the shearing force transmission capability of the fixing member. The anchor which exhibits the restoring function after the relative rotational deformation between the main structure and the additional structure is inserted. The anchor is inserted through the insertion hole of the fixing member, and is arranged in a state straddling the main structure and the additional structure, and is fixed to the main structure and the additional structure, thereby being fixed together with the fixing member (the main structure). ) To transmit the shearing force received from the main structure (additional structure).

  For anchors, rod-shaped steel materials such as bolts (anchor bolts) and steel bars are mainly used, but fiber reinforced plastics and the like are also used. When a bolt is used for the anchor 5, a nut 5a may be attached to the anchor 5 (bolt) as shown in FIG. When the nut 5 a is connected to the axial end of the anchor 5, the nut 5 a functions to secure the fixing effect (pulling resistance force) in the structures 1 and 2 and is connected to a position where the fixing member 4 comes into contact. In such a case, the anchor 5 is joined (regulated) to the fixing member 4 so that the position of the anchor 5 relative to the fixing member 4 does not change.

  The anchor also maintains a fixed state in the main structure and the additional structure on both sides of the fixing member so that the anchor is bent or deformed within the elastic range, or the bending deformation and the expansion deformation are caused. Thus, it follows at the time of relative rotational deformation between the main structure and the additional structure. When the anchor is bent and deformed within the elastic range, it follows the relative rotational deformation of both structures, and after the rotational deformation ends, it acts as a spring that tries to restore the deformation. Since both ends in the axial direction of the anchor maintain the state fixed to the main structure and the additional structure, they also function to suppress (limit) separation of the main structure and the additional structure when accompanied by elongation deformation. .

  The insertion hole of the main body is formed at the center of the main body or the like, but it is not always necessary to have one at the center of the main body, and a plurality of holes may be formed. Depending on the number of insertion holes, one or more anchors are inserted into the main body, but the number is set to such an extent that the relative rotational deformation between the main structure and the additional structure is not hindered. However, when the restoring force of the anchor after the rotational deformation of both structures is expected, it is advantageous to insert a plurality of anchors.

  When the anchor functions as a resistance element against the shearing force in the direction perpendicular to the axis, a resistance force corresponding to the projected area in the shearing force acting direction of the anchor is added to the shearing resistance force of the fixing portion. When the anchor is expected to function as a resistance element against a shearing force, a diameter (thickness) and a length corresponding to the expected shearing resistance are given.

  The anchor is integrated with the main body of the fixing member by screwing into an insertion hole formed in the fixing member or simply by inserting into the insertion hole and filling the insertion hole with an adhesive or mortar. In some cases, the anchor is inserted through the insertion hole of the fixing member (main body part), and from the surface that maintains a state in which the main body part can be bent and deformed, the inner peripheral surface of the insertion hole, the anchor surface, It is better to secure a certain amount of clearance in between.

  The fixing member having the fixing portion and the main body portion and the anchor constitute a fixing device used in the structure joining structure according to claim 1 or claim 2 (claim 3). The fixing device for bonding a structure is disposed across the boundary between the main structure and the additional structure, and has a fixing member having an insertion hole penetrating in the thickness direction in part, and both structures passing through the fixing member. The fixing member is fixed to the fixing structure, the fixing member is fixed to one of the main structure and the additional structure, and the other surface is formed in a convex shape. It has a body part.

  As described above, the fixing member is fixed (embedded) in one structure (main structure in the case of illustration) in the fixing portion, and fixed to the other structure (additional structure in the case of illustration) in the main body ( The horizontal shearing force received from the other structure is transmitted to one structure. Or conversely, the horizontal shearing force received from one structure is transmitted to the other structure. The fixing unit is fixed to one structure by entering (inserting) into a groove formed on the surface of the other structure on the other structure side.

  As described above, relative displacement (displacement deformation) tends to occur at the boundary surface between one structure and the other structure while the contact surfaces of both structures remain parallel to each other during an earthquake as described above. The member tends to receive a horizontal shear force from one structure and the other structure. The main body of the fixing member receives shearing force from the other structure, and the section (part) embedded in one structure that is at least a part of the axial direction of the fixing part receives shearing force from the other structure. It transmits to one structure and bears the reaction force.

  Regardless of the formation position and shape of the fixing portion formed continuously with the main body portion with respect to the main body portion, the annular fixing portion fitted into the groove portion of one structure (main structure) is the outer periphery of the main body portion as described above. In addition to the above, it is formed at a position closer to the inside than the outer periphery of the main body. In the former case, the outer peripheral surface of the fixing unit is continuous with the outer peripheral surface of the main body, and in the latter case, the outer peripheral surface of the fixing unit is located on the inner peripheral side of the outer peripheral surface of the main body.

  The fixing portion is fitted over the entire circumference in the groove portion of one structure formed in an annular shape or a planar shape corresponding to the shape. There are cases where the entire fixing portion is inserted in the depth direction (axial direction) and a part of the section is inserted in the groove portion. A plurality of fixing portions may be formed concentrically in the radial direction (radial direction) of the main body portion.

  When the entire fixing portion (the entire depth direction (axial direction)) is fitted into the groove portion of one structure, the outer peripheral surface of the main body comes into contact with the other structure. When a partial section of the fixing unit is fitted into the groove, the outer peripheral surface of the main body unit and a part of the fixing unit are in contact with the other structure. In any case, as shown in FIG. 11, the outer peripheral surface of the main body bears the shearing force from the other structure, and the shearing force is transmitted from the outer peripheral surface and the inner peripheral surface of the fixing unit to one structure.

  When a rightward shearing force is applied to the fixing member 4 from the other structure (additional structure 2 in the figure) as shown in FIGS. 11A and 11B, the shearing force is the direction of the action. Is received by the outer peripheral surface of the main body portion 42 of the fixing member 4 facing the surface. The shearing force from the other structure (additional structure 2) is received by the projected area in the shearing force acting direction in the outer peripheral surface of the main body 42. In FIG. 11- (a) and (b), the surface which receives a shear force is shown by the thick line.

  The shearing force received by the outer peripheral surface of the main body 42 is directed to the side facing the outer peripheral surface, and the outer peripheral surface and the inner surface of the fixing unit 41 fitted into the groove portion 1b of one structure (main structure 1 in the figure). It is transmitted from the peripheral surface to one structure (main structure 1). As shown in FIG. 11- (b), the fixing unit 41 also transmits the shearing force to one structure (main structure 1) by a projected area corresponding to the direction in which the shearing force acts.

  The shearing force from the other structure (additional structure 2) received by the outer peripheral surface of the main body 42 is obtained by the fixing unit 41 located on the side facing the outer peripheral surface of the main body 42 as shown in FIG. It is transmitted to one structure (main structure 1) from the outer peripheral surface and the inner peripheral surface of the fixing portion 41 located on the same side as the outer peripheral surface of the main body 42. The shearing force acting on one structure (main structure 1) is transmitted to the other structure (additional structure 2) through the reverse path.

  In this way, the fixing portion 41 is formed on the outer periphery of the main body portion 42 of the fixing member 4, and at least a part of the main body portion 42 is located in the other structure (additional structure 2). Is inserted into the groove portion 1b of one structure (main structure 1), so that the outer peripheral surface of the main body 42 comes into contact with the other structure (additional structure 2), and one structure (main structure) In 1), the outer peripheral surface of the fixing unit 41 comes into contact.

  Therefore, the shearing force from the other structure (additional structure 2) is transmitted from the outer peripheral surface of the main body 42 to the main body 42, and is transmitted from the fixing unit 41 to one structure (main structure 1). . Since the fixing portion 41 of the fixing member 4 is fitted in the groove portion 1b formed in an annular shape or the like, a shearing force is applied to one structure (main structure 1) from the outer peripheral surface and the inner peripheral surface of the fixing portion 41. Communicated.

  As the fixing part 41 of the fixing member 4 is fitted into the groove 1b of one structure (main structure 1), the shearing force from the other structure (additional structure 2) is generated from the fixing part 41 as described above. The main body 42 that is transmitted to one structure (main structure 1) but receives shearing force from the other structure (additional structure 2) is transferred from the fixing unit 41 to one structure (main structure 1). , The fixing portion 41 has a function of ensuring the rigidity of the fixing portion 41 so that the fixing portion 41 is not deformed by a reaction force from one structure (main structure 1).

  For example, if the fixing member 4 is composed only of the annular fixing portion 41 and there is no main body portion 42 for connecting the fixing portion 41, the fixing member has the same shape as a steel pipe (Japanese Patent No. 3384992). It is assumed that the fixing portion is deformed in the radial direction when a reaction force of a shearing force is received from the structure or the main structure. That is, when a steel pipe without a main body is fixed (embedded) on both the main structure and the additional structure, the steel pipe bears a shearing force in a direction perpendicular to the axis from the additional structure. When receiving a reaction force from the body, it is easy to bend and deform due to the radial force, and therefore the ability to transmit the shear force to the main structure is low.

  On the other hand, since the main body portion 42 of the fixing member 4 exists on the inner periphery of the annular fixing portion 41, the fixing portion 41 is restrained in the radial direction (radial direction), and the main body portion 42 generates a shearing force by an in-plane force. Since the fixing portion 41 is in a state of transmission, the fixing portion 41 has a large bending rigidity in the radial direction, and the fixing portion 41 does not easily deform in that direction. Therefore, when the fixing unit 41 transmits a shearing force to one structure (main structure 1), the fixing unit 41 receives the resistance force against the reaction force from the one structure (main structure 1). The shearing force can be transmitted to the entire fixing member 4.

  A cylindrical projecting portion that projects to at least one of the front surface side and the back surface side may be formed around the insertion hole 42 a of the main body portion 42 of the fixing member 4. The protrusion is formed with a hollow cross section that is continuous with the insertion hole 42a, and the anchor 5 is inserted through the insertion hole formed in the protrusion with the insertion hole 42a. The formation of the protruding portion on the main body portion 42 changes the cross-sectional shape of the main body portion 42, and thus the protruding portion functions to improve the cross-sectional performance (secondary moment of cross section) of the main body portion 42.

The protruding portion is formed so as to protrude from the main body portion 42 to at least one of the front surface side (the other structural body side) and the back surface side (the one structural body side). It bears together with the part or transmits the shearing force from the other structure to one structure together with the fixing part. When the protrusion is formed on the front side of the main body 42, it bears the shearing force from the other structure, and when it is formed on the back side, it transmits the shearing force to the one structure. The projecting portion may be continuously formed on the front surface side and the back surface side of the main body portion 42.

  By having a fixing portion where the fixing member is fixed to one structure and a main body having a convex surface such as a curved surface on the other structure side, the relative relationship between the main structure and the additional structure When the rotational deformation is about to occur, the main body portion may attempt to rotate and deform relative to the structure on the side, rather than the possibility that the fixing portion is rotationally deformed relative to the structure on the side. Can increase the sex.

  Due to the difference in possibility, the fixing member maintains a fixed state in one structure in the fixing portion and tries to move relative to the other structure in the main body portion. Since relative rotational deformation between the body and the body is not hindered, damage at the joint between the main structure and the additional structure due to forced rotational deformation can be avoided or suppressed in advance.

(A) is a longitudinal sectional view showing a state in which the main structure and the additional structure are joined using a fixing device including a fixing member having a spherical surface and an anchor, and (b) is a view showing that the surface of the main body is added. A longitudinal sectional view showing a state in which the main structure and the additional structure are joined using a fixing device including a fixing member and an anchor having a cylindrical surface centered on the upper end and the lower end of the structure end surface or a part of a spherical surface and an anchor. is there. It is the perspective view which showed the joining state of both structures when a main structure is an existing structure and an additional structure is an earthquake-resistant (damping) reinforcement frame. FIG. 3 is a perspective view in the in-plane direction of FIG. 2 showing a joint portion between a main structure and an additional structure. FIG. 4 is a plan view of FIG. 3. (A) is an elevation view showing a state of bending deformation of both structures when the structure shown in FIG. 2 is viewed in the in-plane direction, and (b) is an enlarged view of a portion B in (a). is there. (A) is an enlarged view of a portion A in FIG. 5- (a) and a portion D in FIG. 7, and (b) is an enlarged view of a portion C in (a). FIG. 6 is a model diagram showing a relationship between the slab of the additional structure and the main structure when the additional structure shown in FIG. 5A is rotationally deformed with respect to the main structure. FIG. 2 is a perspective view illustrating a state in which the fixing device illustrated in FIG. 1A is located on a boundary surface between a main structure and an additional structure as viewed from the fixing unit side of the fixing member. FIG. 2 is a perspective view illustrating a state in which the fixing device illustrated in FIG. 1A is located on a boundary surface between a main structure and an additional structure as viewed from the main body side of the fixing member. FIG. 10 is a perspective view illustrating a state in which the fixing device when the main body portion of the fixing member illustrated in FIG. 9 has a T-shaped planar shape is viewed from the main body portion side of the fixing member. (A) is a longitudinal sectional view showing the basic shape of the fixing member and the state of shearing force transmitted from the other structure (additional structure) to one structure (main structure), and (b) is ( It is a rear view of a).

  Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings.

  In FIG. 1, a fixing device 3 is installed between one structure (main structure) 1 and the other structure (additional structure) 2 that can behave independently of each other when a horizontal force is applied. The example of the joining structure which joined structure 1 and 2 so that relative displacement was possible is shown. Hereinafter, one structure is referred to as a main structure 1 and the other structure is referred to as an additional structure 2.

  The fixing device 3 is disposed across the boundary (boundary surface) between the main structure 1 and the additional structure 2, and has a fixing member 4 having an insertion hole penetrating in the axial direction in a part thereof, and penetrating the fixing member 4. The anchors 5 are fixed to both structures 1 and 2 and can be bent and deformed.

  The fixing member 4 is fixed to one of the main structure 1 and the additional structure 2 and fixed to the other structure 2, and the surface of the fixing member 4 is formed in a convex shape. The main body portion 42 is held, and the structure 2 on the side of the main body portion 42 is in a state in which it can be rotationally deformed relative to the fixing member 4 along the surface thereof. One or a plurality of insertion holes 42a through which the anchor 5 is inserted are formed at the center of the main body 42.

  The combination of the main structure 1 and the additional structure 2 is, for example, a combination of an existing structure as shown in the figure and a new structure that is constructed additionally to the existing structure to reinforce the existing structure by seismic (damping), or newly established. There are combinations of structures constructed in parallel. Since the fixing member 4 and the anchor 5 constituting the fixing device 3 are fixed (embedded) inside the main structure 1 and the additional structure 2, the structural type of the main structure 1 and the additional structure 2 is mainly reinforced concrete. Become.

  2 to 5 show that an anti-seismic (seismic) reinforcement frame as the additional structure 2 is constructed in parallel with the structure on one side of the existing structure as the main structure 1, and the anti-seismic reinforcement frame is applied to the beam of the existing structure. The example at the time of joining this slab is shown. Details will be described below based on this example. 3 shows a joint portion between the beam 1a of the main structure 1 and the slab 2a of the additional structure 2 when FIG. 2 is viewed in the in-plane direction. FIG. 1 shows the beam 1a and the slab 2a shown in FIG. The longitudinal cross-section of the joint part is shown.

  In the example of FIGS. 2 to 5, the additional structure 2 has a structure including a column 2 b and a beam 2 c facing the surface of the main structure 1 and a brace 2 d as a seismic element, and the main structure 1 from the level of the beam 2 c. The slab 2a that projects to the side and is joined to the beam 1a of the main structure 1 is a basic component.

  The pillar 2b of the additional structure 2 is divided in a section unit including a joint with the beam 2c in the height direction, and the pillars 2b and 2b adjacent in the height direction can be relatively moved in the horizontal direction at the divided positions. A seismic isolation device 2f such as a laminated rubber bearing, a sliding bearing, an elastic sliding bearing, etc., is connected to the joint, and a brace 2d with a built-in damper 2e that generates a damping force during axial expansion and contraction is provided between the column and beam joints. It is erected. The slab 2a of the additional structure 2 is joined to the beam 1a of the main structure 1 via the fixing device 3 as shown in FIGS.

  The seismic isolation device 2f is a function that the additional structure 2 is not a mere seismic reinforcement frame, but is a seismic reinforcement frame that attenuates the horizontal force while reducing the input of the horizontal force during the earthquake to the main structure 1. Is interposed to serve to connect the columns 2b and 2b divided in the height direction so as to be relatively movable in the horizontal direction, but the additional structure 2 is a seismic reinforcement frame. In such a case, it is not always necessary.

  3 shows a state in which the additional structure 2 shown in FIG. 2 is looked down in the in-plane direction (direction parallel to the surface where the main structure 1 and the additional structure 2 face each other), and FIG. 4 shows the plane of FIG. Show. As shown in FIGS. 3 and 1, a large number of fixing devices 3 are arranged in the in-plane direction, and one or more stages are arranged in the height direction. When arranged in multiple stages in the height direction, they may be arranged in a staggered pattern.

  In FIG. 3, the end of the additional structure 2 on the beam 2c side of the slab 2a is arranged in two steps in the height direction on the H-section steel constituting the beam 2c in order to ensure the integrity with the beam 2c. The stud (anchor) 2g welded in this manner is joined to the beam 2c in a form of being embedded in the slab 2a. On the other hand, on the main structure 1 side of the slab 2a, the end of the slab 2a is integrated with the main structure 1 so that the end of the slab 2a can be rotationally deformed about a horizontal axis in the composition plane with respect to the main structure 1. Bonding is performed via fixing devices 3 arranged in one stage so that the effect of the property does not increase.

  FIG. 1 shows a state in which the fixing member 4 is arranged with the fixing portion 41 facing the main structure 1 and the main body 42 facing the additional structure 2. The direction may be any direction, and the fixing unit 41 may be disposed toward the additional structure 2 and the main body 42 may be disposed toward the main structure 1.

  As shown in FIGS. 1 and 11, the fixing member 4 is a fixing portion that fits into a groove portion 1 b formed on the surface of the other structure side of one of the main structure 1 and the additional structure 2. 41 and two portions of a main body portion 42 that is continuous to the fixing portion 41 and embedded in the other structure. In a state where the fixing portion 41 is fitted in the groove portion 1b, the groove portion 1b is filled with a filler such as mortar and adhesive, and the movement of the fixing portion 41 in the groove portion 1b is restricted, and the fixing portion 41 is stabilized. .

  The fixing member 4 is disposed between the structures 1 and 2 in a state of straddling the boundary surface between one structure (main structure 1) and the other structure (additional structure 2). As shown, at least a part of the fixing portion 41 in the axial direction is located in the structure (main structure 1) on the side. The groove portion 1 b is formed in a ring shape corresponding to the shape of the fixing portion 41, or a plate shape such as a disk shape including an annular shape surrounding the fixing portion 41.

  The main body portion 42 may have a portion in which at least a part of the surface on the other structure (additional structure 2) side where the main body portion 42 is located is formed in a convex curved surface shape or a polyhedral shape close thereto. The fixing member 4 is mainly formed of a metal material such as a steel material, but the material of the fixing member 4 is not limited, and the fixing member 4 is also formed of a fiber reinforced plastic or the like.

  As described above, the insertion hole 42a for inserting the anchor 5 at one place or a plurality of places is formed in the central portion of the fixing member 4 on the plane of the main body portion 42 or in the vicinity thereof. In the state where the anchor 5 is inserted through the insertion hole 42a, the anchor 5 is applied to each of the one structure (main structure 1) and the other structure (additional structure 2). Accordingly, the anchor 5 is fixed with a sufficient fixing length so as not to come out even when the anchor 5 is stretched and deformed.

  As described above, the anchor 5 secures a clearance between the case where the anchor 5 is connected to the main body 42 by being screwed into the female screw formed on the inner peripheral surface of the insertion hole 42a and the inner peripheral surface of the insertion hole 42a. In addition to simply inserting the insertion hole 42a in the state, the insertion hole 42a may be filled with an adhesive, mortar, or the like and connected to the main body 42 in a state of being inserted through the insertion hole 42a. .

  The fixing portion 41 is fixed in a state in which the fixing portion 41 is fitted in the groove portion 1b of the structure (main structure 1) on the side, so that the direction perpendicular to the direction in which both the structures 1 and 2 face each other (the direction outside the surface) ( 1 when resisting the horizontal shearing force in the (in-plane direction) and relatively rotating and deforming both structures 1 and 2 around the horizontal axis in the in-plane direction, as shown in FIG. The state fixed to the structure (main structure 1) is maintained. The fixing unit 41 exhibits a resistance corresponding to the projected area in the direction against the horizontal shearing force, and resists a bending moment about the horizontal axis in the in-plane direction at the time of rotational deformation. In order to secure the resistance force, it is formed in an annularly closed shape as shown in FIG.

  Similarly to the fixing unit 41, the main body 42 is fixed in a state where it is embedded in the structure (additional structure 2) on the side, so that both structures 1 and 2 face each other (out-of-plane direction). Resists horizontal shearing force in the direction perpendicular to the surface (in-plane direction). When both structures 1 and 2 are about to rotate and deform around the horizontal axis in the in-plane direction, the structure on that side (additional structure 2) slips along the surface of the main body 42, It is formed in a curved surface so as to assist the occurrence of relative rotational deformation with respect to the structure (main structure 1) on the fixing unit 41 side.

  The surface of the main body 42 is formed in, for example, a spherical surface, a three-dimensional curved surface shape close to it, or a polyhedral shape. However, when the other structure (additional structure 2) tends to undergo relative rotational deformation with respect to one structure (main structure 1), the other structure (additional structure 2) Since the slab 2a, which is a housing joined to one structure (main structure 1), tries to rotate with the lower end and upper end on the one structure (main structure 1) side as the center of rotation, When viewed in the inner horizontal direction, it is most desirable to form an arc centered on this rotation center as shown in FIG.

  FIGS. 1A and 9 show an example in which the surface of the main body 42 is a spherical surface, and FIG. 10 shows a shape in which the surface is a part of a spherical surface and parts other than the part where the insertion hole 42a is formed are removed. An example of the case is shown. In any of the shapes, the projection area in the direction resists the horizontal shearing force, but in the case of FIG. 10, a plane perpendicular to the acting direction of the horizontal shearing force is formed. There is an advantage in that it is possible to save material costs while ensuring the same resistance as the case.

  The anchor 5 is inserted through the insertion hole 42 a of the main body portion 42, and both end portions in the axial direction are fixed to the main structure 1 and the additional structure 2. The anchor 5 bears a shearing force in the horizontal direction in the plane of construction, and bears a bending moment at the time of rotational deformation around the horizontal axis parallel to the direction, and has a diameter and length so as to exhibit a function of restoring after the rotational deformation. Is decided. In addition to the nut 5a being connected to the anchor portion of the anchor 5 to the structures 1 and 2 as described above, a rib may be formed by cutting off the internal thread.

  FIG. 5- (a) shows the bending deformation state of the main structure 1 and the additional structure 2 when the additional structure 2 is the seismic reinforcement frame shown in FIG. 2, and (b) shows the B portion in (a). An enlarged view is shown. As described above, the slab 2a of the additional structure 2 is joined to the beam 2c via the stud 2g arranged in parallel in the height direction, thereby ensuring integrity. The column 2b is separated from the column 2b adjacent to the lower side via the seismic isolation device 2f, so that both the columns 2b and 2b can be relatively moved in the horizontal direction while maintaining the vertical state. .

  In particular, in FIG. 5, when a laminated rubber bearing comprising a laminated rubber and flanges joined to both axial ends thereof is used as the seismic isolation device 2f, a bottom surface is provided between the upper flange and the pillar 2b positioned thereon. By interposing the connecting member 2h having a spherical shape, both the columns 2b and 2b can be rotated so that the column 2b positioned on the lower side and the column 2b positioned on the upper side with respect to the seismic isolation device 2f can be rotationally deformed to each other. It is connected. The connecting member 2h is fixed to the lower end of the upper column 2b at the upper part, and is in contact with the upper flange of the seismic isolation device 2f at the lower part so as to be rotatable around an arbitrary horizontal axis.

  In this case, the upper column 2b can be moved relative to the lower column 2b in the horizontal direction by the seismic isolation device 2f, and at the same time can be rotated around the horizontal axis by the connecting member 2h. When the slab 2a joined to the beam 2c joined to 2b bends and deforms following the bending deformation of the main structure 1, the upper column 2b to which the slab 2a is connected as shown in FIG. As the roller rotates to the main structure 1 side, the part moves horizontally to the main structure 1 side with respect to the lower column 2b. The fact that the upper column 2b is movable relative to the lower column 2b in the horizontal direction is not necessarily required by the seismic isolation device 2f, and the main structure is formed by bending the slab 2a in the out-of-plane direction. It can also occur by following the bending deformation of 1.

  Since the slab 2a of the additional structure 2 is rigidly joined by the stud 2g parallel to the beam 2c joined to the upper column 2b, on the seismic isolation device 2f side below the column 2b to which the slab 2a is connected. As shown in FIG. 6A, the end of the slab 2a on the main structure 1 side tends to move (rise) above the horizontal state before deformation as shown in FIG. 6A is an enlarged view of a portion D in FIG. 7. In FIG. 6A, the alternate long and short dash line indicates the center line on the longitudinal section of the slab 2 a before deformation.

  Here, the presence or absence of the influence on the fixing state of the anchor 5 due to the rise of the end of the slab 2a on the main structure 1 side is confirmed. As shown in FIGS. 6A and 6B, the rotation angle from the state before deformation of the column 1c constituting the main structure 1 in the state shown in FIG. 7 is θ1, and the slab 2a of the additional structure 2 The rotation angle from the state before the deformation of the end surface on the main structure 1 side is defined as θ2. Further, the horizontal displacement amount of the column 1c of the main structure 1 from the state before the deformation on the center line of the slab 2a of the additional structure 2 is δ1, and the horizontal displacement of the end surface of the slab 2a of the additional structure 2 from before the deformation. Let the amount be δ2.

  Since θ1 is the interlaminar deformation angle of the multistory shear wall of the main structure 2, assuming that θ1 = 1/250, the thickness of the slab 2a of the additional structure 2 is 200 mm (upper end from the center line of the slab 2a, or If the distance to the lower end is 100 mm), it is 0.4 mm from δ1 = 100 × tan θ1 = 100 × 1/250.

  On the other hand, the amount of vertical displacement of the end of the slab 2a on the main structure 1 side from the state before deformation is δv, and the additional structure 2 is determined from the center line of the column 1c on the additional structure 2 side of the main structure 1. If the distance (separation distance) to the center line of the column 2b is e, δv = e × tan θ2 from FIG. Here, in the case of e = 2500 mm, assuming that δv = 5 mm, tan θ2 = 1/500 from 5 = 2500 × tan θ2, and 0.2 mm from δ2 = 100 × tan θ2 = 100 × 1/500.

  Since the distance δ between the main structure and the additional structure on the center line of the slab of the additional structure is δ = δ1 + δ2, it is 0.6 mm. If e = 2500 mm and δv = 10 mm, then δ = 0.8 mm.

  δ is a distance at which the main structure 1 and the additional structure 2 are separated when the main structure 1 and the additional structure 2 are relatively rotationally deformed, and corresponds to the elongation deformation amount of the anchor 5. If the fixing length sufficiently exceeding the elongation deformation amount of 5 is secured on the main structure 1 and the additional structure 2 side, the anchor 5 will not come off. As a result, the situation where the main structure 1 and the additional structure 2 are separated due to relative rotational deformation is also avoided, and the anchoring state of the anchor 5 is not affected.

  8 shows a state in which the fixing member 4 shown in FIG. 1A is viewed from the fixing portion 41 side (main structure 1 side), and FIG. 9 shows the fixing member 4 shown in FIG. The state seen from the side (additional structure 2 side) is shown. The side surface of the beam 1a of the main structure 1 that is the boundary surface between the main structure 1 and the additional structure 2 (the end surface of the slab 2a of the additional structure 2) is a section in which the fixing member 4 transitions from the fixing portion 41 to the main body portion 42. The fixing portion 41 is located in the beam 1 a of the main structure 1, and the main body portion 42 is located in the slab 2 a of the additional structure 2.

  10 shows the fixing member 4 when the main body 42 is formed in a shape in which the main body 42 in FIG. 9 is removed from the main body 42 except for the insertion hole 42a through which the anchor 5 is inserted. The state seen from the body 2 side) is shown. In FIG. 10, the region including the insertion hole 42 a of the main body 42 in FIG. 9 is left in a band shape, and other regions are removed, and the main body 42 is formed in a T shape on a plane.

  When the main body 42 is formed in the shape shown in FIG. 10, the side surfaces of the portion that is left in the strip shape are oriented in the horizontal direction in which the main structure 1 (beam 1a) and the additional structure 2 (slab 2a) are deformed. When the fixing member 4 is arranged in a state in which the fixing member 4 is placed, there is an advantage that the horizontal shearing force in that direction is easily received. If the horizontal shearing force is not perpendicular to the surface that receives the shearing force, the surface cannot fully support the horizontal shearing force, whereas the side surface of the part that is left in the strip shape is not affected by the horizontal shearing force. If it is vertical, it is based on the fact that its side can fully bear the horizontal shear force.

1 ... main structure, 1a ... beam, 1b ... groove, 1c ... pillar,
2 …… Additional structure 2a …… Slab 2b …… Column 2c …… Beam 2d …… Brace 2e …… Damper 2f …… Seismic isolation device 2g …… Stud 2h …… Connecting member
3. Fixing device,
4... Fixing member, 41... Fixing portion, 42... Main body portion, 42 a.
5 …… Anchor, 5a …… Nut.

Claims (3)

It is a joint structure in which a fixing device is installed between the main structure and the additional structure that can behave independently of each other when a horizontal force is applied, and both structures are joined so as to be relatively displaceable.
The fixing device is disposed across the boundary between the main structure and the additional structure, and has a fixing member having an insertion hole that partially penetrates in the thickness direction, and is fixed to both structures through the fixing member. And an anchor capable of bending deformation,
The fixing member is installed across the main structure and the additional structure, is fixed to one of the main structure and the additional structure, is fixed to the other, and the surface on the side is fixed. has a body portion which is formed in the shape of convex, Ri relative rotation deformable der structure that side is relative to the fixing member along the surface of the body portion,
A large number of the fixing devices are arranged in a direction orthogonal to a direction in which the main structure and the additional structure are opposed to each other .
  When the surface of the main body portion of the fixing member is viewed in a horizontal direction orthogonal to the direction in which the main structure and the additional structure face each other, the smaller side of either the main structure or the additional structure 2. The joint structure according to claim 1, wherein the structure is formed in an arc shape centering on a lower end and an upper end of the structure or a shape close thereto. A fixing device used for the structure joining structure according to claim 1 or claim 2,
A fixing member that is disposed across the boundary between the main structure and the additional structure, and has a through-hole partially penetrating in the thickness direction, is fixed to both structures through the fixing member, and is bent and deformed. With possible anchors,
The fixing member has a fixing portion fixed to one of the main structure and the additional structure, and a main body portion fixed to the other, the surface of which is formed in a convex shape. Fixing device for joining structures.

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