JP2003184180A - Anchorage device of column base and anchorage part of column base using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To shorten the length of embedding of an anchor bolt for anchoring a base plate of a column base of a steel column in foundation concrete of a steel structure or the like. <P>SOLUTION: An anchoring tube 2 is anchored in the foundation concrete 6 near an upper end of the foundation concrete 6 and an anchor bolt 3, penetrating a base plate 9 and a head part thereof being fixed to the base plate 9, is inserted into the anchoring tube 2 keeping a distance from the inner peripheral surface thereof. A sleeve 4, integrated with a shaft or the periphery of the anchor bolt 3, is connected to the anchoring tube 2 by means of tie rods 5 so that the tie rods 5 may exhibit energy absorption capacity when relative displacement of the anchor bolt 3 to the anchoring tube 2 occurs. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a column base fixing device for fixing a base plate of a steel frame structure, a steel frame reinforced concrete structure, or a steel pipe concrete structure to a base concrete.

[0002]

2. Description of the Related Art A column base of a steel frame or other steel column is fixed to a base concrete by tightly connecting an anchor bolt embedded in the base concrete to a base plate joined to the bottom surface thereof. Since the pulling force is resisted by the adhesive force between the shaft portion of the anchor bolt in the concrete and the concrete, the diameter and the embedded length of the anchor bolt tend to increase.

Particularly, the embedding length of the anchor bolt is determined so that the product of the allowable bond stress and the peripheral length of the anchor bolt exceeds the pull-out force. Therefore, the length of the anchor bolt is generally 20 to 30 times the diameter of the anchor bolt. Need

When a fixing plate or the like is connected to the tip of the anchor bolt, the embedding length can be made shorter than when only the anchor bolt is used, but it is still necessary to secure at least 20 times the diameter of the anchor bolt.

Patents No. 2100158, No. 2666652, No. 266
No. 6659 incorporates a damper that generates a damping force at or near the head of the anchor bolt, making the restoring force characteristics of the column base energy-absorbing so that when a certain pull-out force acts on the column base Has been shown, and the energy generated in the column base is absorbed by the plastic deformation capacity of the column to avoid the situation in which an excessive tensile force acts on the anchor bolt.

However, since the damper is located on the base plate, the function of the damper is not exerted unless the base plate is lifted up with respect to the anchor bolt, and the anchor bolt is used for the base plate to be lifted up with respect to the anchor bolt. Since the fixing state must be maintained in the basic concrete due to the adhesive force and the support pressure of the fixing plate at the tip, the damper does not function to reduce the adhesive force at the shaft portion of the anchor bolt, and the anchor bolt's It does not lead to shortening the embedding length.

In view of the above background, the present invention proposes a column base fixing device capable of shortening the embedded length of the anchor bolt.

[0008]

According to the present invention, a fixing tube is fixed near the top end of a base concrete, and an anchor bolt that penetrates the base plate and has its head fixed to the base plate is provided inside the fixing tube. It is possible to shorten the embedded length of the anchor bolt by inserting a distance between the anchor bolt and the shaft portion of the anchor bolt, or by connecting the sleeve and the fixing tube integrated with the anchor pipe with a connecting material. . Further, it is possible to exert the resistance force and the plastic deformation ability of the tie member from the time when the pulling force acts on the anchor bolt from the base plate.

The fixing pipe is fixed by embedding in the new basic concrete. In the existing basic concrete, the fixing pipe is fixed not only by the embedding but also by the fixing hole formed by the perforation from the top end by the rotation of the core tube having the cutting blade. To be done.

The fixing device is composed of a fixing tube, an anchor bolt and a connecting material as described in claim 1, or in addition to this, a sleeve integrated with the shaft portion of the anchor bolt. The fixing device according to a second aspect is particularly a case where the sleeve is integrated with the shaft portion of the anchor bolt by screwing.

Integrating the sleeve with the anchor bolt by a method other than screwing works by joining the sleeve with a larger surface area than by joining the connecting material directly to the anchor bolt with a smaller surface area than without the sleeve. This is performed when it is easy, and in that case, the sleeve and the anchor bolt are integrated by welding, shrink fitting, or the like. The integration by screwing is adopted particularly when the fixing tube and the anchor bolt are separated and installed.

Although the head of the anchor bolt is fixed to the base plate, in the state of use, the nut is screwed onto the anchor plate from above the base plate as in the conventional method, as described in claims 8 and 9. Alternatively, it is fixed to the base plate by welding or the like, and the anchor bolt tries to float together with the base plate when the base plate tries to float due to the pulling force, causing relative displacement with the fixing tube and forcing it to the connecting material. Give a transformation to.

Depending on its form, the tie material bears a bending moment and a shearing force when the anchor bolt together with the base plate causes a relative displacement in the axial direction with respect to the anchorage tube anchored in the foundation concrete to exceed a certain amount. While absorbing the energy by yielding while absorbing the bending moment and the torsion moment, the pulling force acting on the column base is reduced.

The connecting member reduces the pull-out force while exerting the energy absorbing ability when the relative displacement of the anchor bolt, which is about to float together with the base plate, with respect to the fixing tube occurs. However, in order to exert the pull-out force reducing effect of the connecting member. Since the anchor bolt does not need to maintain a fixed state in the foundation concrete and is allowed to float together with the base plate, it is not necessary to secure the embedded length to obtain the adhesive force of the anchor bolt,
It is possible to reduce the length of the anchor bolt itself.

In the basic concrete, since the fixing pipe that causes relative displacement between the anchor bolt and the anchoring bolt may be maintained in a fixed state, the fixing depth of the fixing device corresponding to the embedding length of the conventional anchor bolt in the basic concrete. Can be made extremely shorter than the conventional anchor bolt.

In addition to reducing the pull-out force acting on the column base due to energy absorption by the connecting material, the pull-out force acting on the base plate from the column base is transmitted from the anchor bolt to the connecting material, and is mainly borne by the connecting material. By doing so, the load on the base plate is reduced,
It is possible to reduce the scale of the base plate itself, such as reducing the thickness of the base plate.

By reducing the size of the base plate, it is possible to reduce the diameter of the anchor bolt and also design the column base as a pin column base. Therefore, the column base is fixed by setting the dimensions of the base plate and the anchor bolt. A wide range from legs to pin posts can be evaluated and designed appropriately.

The pulling force is transmitted from the shaft portion or sleeve of the anchor bolt to the connecting material, and further from the connecting material to the fixing tube. The fixing tube has a diameter larger than the diameter of the anchor bolt, so that the extracting force is increased. Since it has sufficient adhesion with the basic concrete to resist against, it is basically avoided that the fixing tube is pulled out. If the adhesive force on the peripheral surface is not enough, for safety, the shear connector and the fixing tube are circulated on the outer peripheral surface of the fixing tube so that the fixing state can be maintained even with the pulling force to the extent that the connecting material yields. A fixing plate or the like is provided so as to project.

Since the connecting material bears a bending moment and a shearing force when the anchor bolt or the sleeve moves parallel to the fixing tube, both ends are welded to the anchor bolt or the sleeve and the fixing tube. It is joined together.

The yield strength and plastic deformation capacity of the tie material can be freely set by selecting the material, setting the material strength, the number of arrangements, the shape, the distance between the anchor bolt and the fixing tube, and other settings. And the rigidity can be adjusted freely. As a material for the tie material, for example, it is suitable to use mild steel or ultra-mild steel, which has a lower material strength than the material of anchor bolts and fixing tubes, but the yield strength can be suppressed more than that of anchor bolts by setting the material strength itself. Therefore, the same material as the anchor bolt may be used in some cases.

The shape of the connecting material is not particularly limited to a plate shape, a rod shape, a coil spring shape or the like, but in the case of a plate shape or a rod shape, all the connecting materials uniformly exert a resistance force as described in claim 3. As described above, a plurality of anchor bolts are arranged between the anchor bolts and the fixing tubes at intervals in the axial direction and the circumferential direction of the shaft portion. In this case, it is also possible to change the yield strength for each one or a plurality of binders and to gradually yield the binder as a whole.

After the yielding of the connecting material, only the deformation δ of the connecting material increases as shown by the solid line in FIG. 5, and the energy absorbing capacity is maintained by the plastic deformation capacity, so that the pulling force P acting on the column base increases. Since the deformation of the pedestal is increased, the pedestal of the present invention is equivalent to the energy absorption amount of the conventional pedestal which is resisted by the proof stress of the anchor bolt and the base plate shown by the broken line in FIG. The amount of energy absorbed by the tie material above a certain level is acquired.

In addition, as shown by the solid line in FIG. 6, the bending moment M acting on the column base does not increase after the yielding of the connecting material, and only the rotation angle φ of the column base increases, so that the column base is pinned. It can be treated as a column base.

Although the column base that resists by the proof stress of the anchor bolt and the base plate like the conventional column base shown by the broken line in FIG. 6 is treated as a rigid joint by design,
Except when covering the area around the base plate with concrete, it cannot be considered as completely rigid because the bending deformation of the base plate and the elongation deformation of the anchor bolt may occur due to the pull-out force. It is difficult to say that the rigidity and proof stress of the column base have been properly evaluated.

On the other hand, if the column base is treated as a pin column base, the bending moment of the stigma on the floor directly above becomes large, but in some cases it is easy to design the entire ground floor. In some cases, it is more rational to use a pin pedestal, and as described above, it is possible to handle the pedestal after the yielding of the connecting material as a pin pedestal, so that the rigidity and yield strength of the pedestal are appropriate. It becomes possible to evaluate the rational design and appropriate performance of the column base after the evaluation.

In the fixing device, since the connecting material is integrated with the anchor bolt, or the sleeve and the fixing pipe, the fixing device is fixed in the basic concrete mainly when the basic concrete is constructed. If the sleeve is integrated with the shaft part of the, the fixing tube and the sleeve, which are integrated with the connecting material, are embedded in the foundation concrete, and then the anchor bolt is screwed into the sleeve while adjusting the level of the base plate. Therefore, the construction accuracy of the column base can be improved.

Both claim 1 and claim 2 can be applied to the existing basic concrete, but in the case of claim 2, since the anchor bolt and the fixing pipe can be separated, the existing basic concrete can be used. In contrast, by forming the fixing hole, it can be easily installed even when applied to an existing column base.

In the existing basic concrete, the fixing pipe is fixed to the fixing hole formed from the top end of the basic concrete. When applied to the existing basic concrete, it is necessary to prevent the fixing pipe from coming out of the basic concrete. In order to enhance safety, as described in claim 4, the fixing hole is formed in a shape having a portion having a larger cross-sectional area on the inner side than the cross-sectional area on the front side in at least a part of the depth direction. It is appropriate to fill the fixing material in the fixing hole around the fixing tube.

In this case, a part of the existing base concrete on the surface layer side is removed to form a fixing hole, and the fixing pipe is inserted into the fixing hole. By forming a portion having a larger cross-sectional area on the inner side than the cross-sectional area on the front side in at least a part of the section, the resistance to the pulling force acting on the anchor bolt is increased without expanding the range of the fixing hole. It will be possible.

The cross-sectional area of the fixing hole means an area of a cross section orthogonal to the axis of the anchor bolt. The fixing hole has a cross-sectional area of at least a part of the depth direction, for example, a staircase from the surface side to the back side. Shape, or has a portion that gradually expands continuously, and the cross-sectional area of the entire removed portion gradually or gradually increases toward the inner side, as well as a section with a small cross-sectional area There is a case where a large section is alternately repeated.

In forming the fixing hole, as described in claim 5, the fixing hole is divided into two sections in the depth direction, the front side and the rear side,
When the front-side section has a cylindrical shape and the rear-side section has a cylindrical shape with a diameter larger than that of the front-side section, the shape is the simplest and the formation is easy.

In any of the shapes, since the removed portion of the concrete which is the fixing hole has a portion having a larger cross-sectional area on the inner side than the cross-sectional area on the front surface side, the filler filled in the removed portion is anchor bolts. When the pulling force is applied to the surface side of the basic concrete from the fixing pipe, the existing basic concrete is locked in the removed portion, or has a locking portion that can be engaged with the surface side. In the case of the fifth aspect, the surface on the front surface side of the rear side section serves as the locking portion.

Due to the shape of the filler having this locking portion,
In addition to the adhesive force between the filler and the inner peripheral surface of the removed part, the pull-out force acting on the fixing tube fixed in the filler of the fixing hole is added to the existing concrete in the locking part. Since it resists due to the bearing pressure, the resistance increases as compared with the case where only the adhesive force is applied.

Particularly, as described in claim 6, at least a part of the entire fixing hole in the depth direction has a shape in which the cross-sectional area gradually increases from the surface side to the back side as described above. In this case, the locking part is inclined with respect to the cross section orthogonal to the axis of the anchor bolt, so that the existing basic concrete can be pulled out from the outer edge of the locking part of the filling material against the pulling force received from the filling material. Since it resists in the area that gradually expands toward the surface side of the, it is highly safe against the destruction of existing concrete.

As a concrete example of the shape of claim 6, as described in claim 7, the fixing hole is divided into three sections of a section on the front surface side, a section on the back side and a section in the middle, and the front surface side. The section has a cylindrical shape, the middle section has a truncated cone shape, and the rear side section has a cylindrical shape with a diameter larger than that of the front side section. In this case, the engaging portion is formed on the surface of the truncated cone-shaped intermediate section on the front surface side, and has a shape in which the diameter gradually increases from the front surface side to the back side.

[0036]

BEST MODE FOR CARRYING OUT THE INVENTION The invention according to claims 1 to 7 is joined to a lower end of a column base 8 and a fixing pipe 2 fixed to a top end of a foundation concrete 6 as shown in FIG. The anchor bolt 3 which penetrates the base plate 9 and is inserted into the fixing tube 2, and the sleeve 4 which is integrated with the shaft portion of the anchor bolt 3 or the periphery thereof by screwing or other means.
And a fixing pipe 2 for connecting the fixing pipe 2 to the fixing pipe 2 and fixing the base plate 9 to the foundation concrete 6
Is. In the drawing, the sleeve 4 is attached to the shaft portion of the anchor bolt 3.
The fixing device 1 according to claim 2 is integrated by screwing.

According to the present invention as defined in claims 8 and 9, the fixing device 1 is used and the head of the anchor bolt 3 is attached to the base plate 9.
This is a fixing portion in which the column base 8 is fixed to the foundation concrete 6 in a state of protruding upward and being fixed to the base plate 9 by tightly connecting the nut 10 or the like.

The fixing pipe 4 has a cylindrical shape such that the inner diameter of the inner peripheral surface such as the inner diameter is larger than the diameter of the anchor bolt 3 or the outer diameter of the sleeve 4, or a cylindrical shape such as a polygonal prism, and the upper end thereof is the basic concrete 6 Foundation concrete 6 to be located at the top of
It is buried inside. In the existing basic concrete 6, it is fixed in the fixing hole 7 formed from the top.

In the drawing, the bottom surface of the fixing tube 2 is closed in order to keep the inside of the fixing tube 2 hollow, but if the infiltration of concrete into the inside of the fixing tube 2 is prevented in the new basic concrete 6, It is not always necessary to close the bottom surface of the fixing tube 2, and it is not necessary to close the bottom surface of the fixing tube 2 even in the case of the existing basic concrete 6 except when the below-mentioned filling material 12 is filled.

Further, the inside of the fixing tube 2 is kept hollow so as not to hinder the deformation of the connecting material 5, but the connecting material is used for preventing the rust of the shaft portion of the anchor bolt 3, the sleeve 4, and the connecting material 5. The fiber material or fluid may be filled to the extent that the deformation of No. 5 is not hindered.

The anchor bolt 3 and the sleeve 4 are the fixing tube 2
Inserted at a distance from the inner peripheral surface thereof, the connecting material 5 is laid between the outer peripheral surface of the anchor bolt 3 or the sleeve 4 and the inner peripheral surface of the fixing tube 2, and the anchor bolt 3 is When a relative displacement with respect to the fixing tube 2 in the axial direction exceeds a certain amount, it yields and absorbs energy by the elasto-plastic hysteresis characteristic.

The connecting member 5 is integrally joined to the anchor bolt 3 or the sleeve 4 and the fixing tube 2 at both ends by welding or the like so that the bending moment and the shearing force are borne by the pulling force from the anchor bolt 3. For convenience of welding the connecting material 5, for example, the fixing tube 2 is divided in the axial direction or the circumferential direction, and the connecting material 5 is welded to the anchor bolt 3 or the sleeve 4 and the fixing tube 2 and then separated. May be welded together to be integrated.

The connecting material 5 connects the anchor bolt 3 and the sleeve 4 to the fixing tube 2, and the anchor bolt 3 and the sleeve 4 are connected.
Any form may be used as long as it has a function of elasto-plastic deformation associated with the displacement of the fixing tube 4, but the tensile force from the anchor bolt 3 is not concentrated on a specific connecting member 5 but is dispersed on all the connecting members 5. For transmission, the cross sections are evenly arranged in the circumferential direction of the anchor bolt 3 as shown in FIG.

In the drawing, in order to enhance the deformability of the tie member 5 in each direction, the single tie member 5 is formed into a plate shape having a large length / height, and the bending moment due to the tensile force from the anchor bolt 3 is applied to the surface. The anchor bolts 3 are arranged at intervals in the axial direction of the anchor bolt 3 in the direction of receiving the internal force.

When one end of the connecting material 5 is joined to the sleeve 4, the fixing pipe 2 is integrated with the sleeve 4 when the basic concrete 6 is constructed, or the fixing hole 7 is formed in the existing basic concrete 6. After that, the anchor bolt 3 is embedded in concrete and fixed, and after the fixing pipe 2 is fixed, the anchor bolt 3 is screwed into the sleeve 4 to be integrated. When the connecting material 5 is joined to the shaft portion of the anchor bolt 3, the fixing pipe 2 is embedded and fixed in concrete in a state of being integrated with the anchor bolt 3.

An anchor bolt 3, on the outer peripheral surface of the fixing tube 2,
Alternatively, a shear connector 2a such as a stud bolt is provided so as to project as necessary so that the pull-out force transmitted from the sleeve 4 and the connecting member 5 does not cause the concrete concrete 6 to come out. In place of the shear connector 2a, a disc-shaped plate that surrounds the outer circumference of the fixing tube 2 may be provided so as to project.

The leveling mortar 11 that receives the base plate 9 is filled on the top end of the base concrete 6, but the upper end of the fixing tube 2 is filled so that the mortar does not enter the inside of the fixing tube 2 when filling the leveling mortar 11. Is blocked.

In the case of a new construction, after the foundation concrete 6 is constructed, the column base 8 integrated with the base plate 9 is installed on the foundation concrete 6, the leveling mortar 11 is filled under the base plate 9, and the anchor is applied from above the base plate 9. By fixing the head of the anchor bolt 3 to the base plate 9 by tightly connecting the nut 10 to the head of the bolt 3, fixing of the column base 8 is completed.

The anchor bolt 3 may be integrally fixed to the base plate 9 so that it floats up together with the base plate 9 when the base plate 9 tries to float up due to the pulling-out force. Therefore, the head of the anchor bolt 3 is welded to the base plate 9. Sometimes hardened to 9.

In the drawing, in order to transmit the pull-out force from the base plate 9 to the shaft portion of the anchor bolt 3 without loss, the pull-out force does not cause the section of the head portion of the anchor bolt 3 which sandwiches the base plate 9 to yield and has an elastic range. Nuts 10, 10 from both sides of the base plate 9 so that it stays inside.
, And the head of the anchor bolt 3 is restrained.
The head may be tightly connected to the base plate 9 in a double nut form. In this case, the nut 10 on the lower surface side of the base plate 9 is insulated from the leveling mortar 11 so as not to hinder the axial displacement of the anchor bolt 3 due to the pulling force.

Although not shown, the tip of the sleeve 4 in FIG. 1 is extended and the sleeve 4 is integrated with the bottom plate closing the bottom surface of the fixing tube 2, or the bottom plate of the fixing tube 2 is fixed to the fixing tube 2.
The sleeve 4 itself is fixed to the foundation concrete 6 by separating it from the end of the sleeve 4 and increasing the yield strength of the binder 5, thereby increasing the yield strength of the binder 5.
By making the connecting member 5 rigidly joined to the sleeve 4 and the fixing tube 2 so as to fix the column base 4 to an infinite amount while keeping the embedded depth in the basic concrete 6 as the fixing device 1 short. You can also get closer to.

FIGS. 3 and 4 show a construction example in which the fixing holes 7 are formed in the existing basic concrete 6 and the fixing device 1 is installed. In this case, the fixing hole 7 is formed in a shape having a portion having a larger cross-sectional area on the back side than the cross-sectional area on the front side in at least a part of the depth direction in order to enhance resistance to the fixing tube 2 from coming out. Then, a filler 12 such as cement milk, mortar, concrete or an adhesive is filled around the fixing tube 2 in the fixing hole 7.

In the drawing, the fixing hole 7 has a shape in which the cross-sectional area gradually increases from the front surface side to the back side as a whole, and in particular, the fixing hole 7 has the front surface side section and the back side section, and The case of claim 7 divided into the middle section is shown.

According to the seventh aspect of the present invention, the middle section is formed in the shape of a truncated cone whose surface area extends from the front side to the inner side, and the cross-sectional area gradually expands. However, the fixing hole 7 has at least a part in the depth direction. Since it is sufficient that the section has a portion having a larger cross-sectional area on the back side than the cross-sectional area on the front side, the shape without the middle section of claim 7, that is, the front-side section has a cylindrical shape and the back-side section has May be formed in a cylindrical shape having a diameter larger than that of the surface side section (Claim 5).

In addition, the fixing hole 7 may have a shape in which a circular truncated cone and a cylinder are combined without a surface-side section of claim 7 or a shape having only a circular truncated cone only in an intermediate section.

The fixing hole 7 may have a portion having a larger cross-sectional area on the inner side than the cross-sectional area on the front side in a part of the section.
Since it is not necessary to have a shape in which the cross-sectional area gradually or gradually expands toward the inner side as a whole, fixing the shape shown in the figure or the shape without a part of the above-mentioned shape The fixing holes 7 may be formed in a shape in which the holes 7 are alternately repeated in the depth direction.

As shown in FIG. 3, the fixing hole 7 of the existing basic concrete 6 has a portion having a larger cross-sectional area on the inner side than the cross-sectional area on the front side, so that the fixing hole 7 is filled around the fixing tube 2. Due to the hardening, the filled filler 12 is locked or engaged with the surface of the basic concrete 6 in the fixing hole 7 when receiving the pulling force to the surface of the basic concrete 6 acting on the fixing pipe 2. It has a shape having a locking portion 7a to be obtained.

As shown in the figure, when the fixing hole 7 is divided into two or more sections in the depth direction, the locking portion 7a has
It is formed in a portion closer to the front surface side than the back side portion. In the case of only the truncated cone shape or including it, the locking portion is formed in the portion closer to the surface side in a shape inclined with respect to the cross section orthogonal to the axis of the fixing tube 2.
7a is formed.

For example, as shown in FIG. 7, the central portion of the fixing hole 7 is removed from the central portion on the cross section by rotating the core tube 13 having the cutting blade 13a at the tip, and then the central portion is removed as shown in FIG. The peripheral portion of the portion is formed by removing a cylindrical or blade-shaped bit 14 having a cutting blade 14a at the tip or the peripheral surface thereof to remove it into a truncated cone shape or a column shape.

In the case of FIGS. 7 and 8, the core tube 13 is connected to the drive shaft 16a of the drive device 16 supported by the support member 15 temporarily fixed to the surface of the foundation concrete 6 so as to be able to move up and down. The core tube 13 is rotated around the axis of the drive shaft 16a so that the cutting blade 13a at the tip separates concrete shown by hatching from the periphery into a columnar shape. Cylindrical concrete is pulled out in the same shape as core removal.

After that, instead of the core tube 13, for example, the shaft of the rod 14b to which the cylindrical bit 14 is connected is the drive shaft 16a.
The attachment 17 eccentrically connected to the drive shaft
Connect to the tip of 16a, rotate the drive shaft 16a,
Is rotated around the drive shaft 16a, the rotation of the drive shaft 16a is transmitted to the rod 14b of the bit 14, and the bit 14 is rotated to rotate the bit 14 on its own to conical the concrete shown by hatching around the cylindrical removal portion. Alternatively, it is pulverized into a cylindrical shape. The crushed concrete powder is removed by injecting air or sucking air, and the fixing holes 7 are formed.

Although not shown, a bit in which the cutting blade is eccentric with respect to the shaft of the drive shaft 16a or the rod to which a rotational force is applied from the drive device 16 or the shaft is bent with respect to the shaft of the drive shaft 16a or the rod. By using the bit of the shape, after fixing it to the cylindrical shape by the core tube 13, or from the beginning without using the core tube 13, the fixing hole is formed in a cylindrical shape, a truncated cone shape, or a combination of a circular column and a truncated cone. It is also possible to form 7. Besides, the fixing hole 7 can be formed in an arbitrary shape by jetting water at an ultrahigh pressure.

After the fixing hole 7 is formed, the filling material 12 is filled on the inner side thereof, and the fixing tube 2 is inserted together with the sleeve 4 or the anchor bolt 3 in a state where the lower end of the fixing tube 2 is closed. When the fixing tube 2 is inserted so as to be inscribed in the section on the surface side of the fixing hole 7, the fixing tube 2 is closed at the lower end.
The filler 12 may be filled after the insertion.

A protrusion or a stud bolt for obtaining an adhesive force or a bearing force between the fixing tube 2 and the filling material 12 is provided in a section on the inner side of the fixing tube 2.
A shear connector 2a such as a fixing plate is provided so as to project if necessary.

As shown in the figure, when the fixing tube 2 is inserted so as to be inscribed in the section on the surface side of the fixing hole 7, the fixing tube 2
When the shear connector 2a can collide with the section on the front surface side of the fixing hole 7 when inserting, the shear connector 2a is pulled into the fixing tube 2 and then pushed out to the outer peripheral side, or the surface side of the fixing hole 7 is inserted. The section is formed in an elliptic cylinder shape in which the fixing tube 2 can be inscribed, and the fixing tube 2 is rotated after the fixing tube 2 is inserted, so that the shear connector 2a is arranged in the section on the inner side of the fixing hole 7.

When the filling material 12 is filled after the fixing pipe 2 is inserted, the filling hole 6a and the discharge hole 6b are communicated around the fixing hole 7 from the top end of the basic concrete 6 to the section on the inner side of the fixing hole 7.
Is formed, and the filling material 12 filled from the injection hole 6a is continuously filled until it overflows from the discharge hole 6b, so that the section on the inner side of the fixing hole 7 is densely filled.

[0067]

According to the first and second aspects of the present invention, the fixing tube is fixed near the top end of the basic concrete, and the anchor bolt is inserted into the fixing tube and fixed with the sleeve integrated with the shaft portion of the anchor bolt and its periphery. By connecting the pipes with a connecting material, the anchor bolts that have the ability to absorb energy when the relative displacement of the anchor bolt that tries to float up with the base plate with respect to the fixing tube occurs and the pulling force of the column base is reduced It is not necessary to keep it fixed in the base concrete.

Therefore, it is not necessary to secure the embedded length for obtaining the adhesive force of the anchor bolt, and the length of the anchor bolt itself can be shortened.

In the basic concrete, since the fixing pipe that causes a relative displacement with the anchor bolt needs to maintain the fixing state, the fixing depth of the fixing device corresponding to the embedding length of the conventional anchor bolt into the basic concrete is deep. The length can be made extremely shorter than the conventional anchor bolt.

In addition to reducing the pulling force acting on the column base due to the energy absorption of the linking member, the pulling force acting on the base plate from the column base is transmitted from the anchor bolt to the linking member and is borne by the linking member. Since the load on the base plate is reduced, the thickness of the base plate can be reduced, and the scale of the base plate itself can be reduced.

Since the column base can be treated as a pin column base after the yielding of the connecting material, it is also possible to appropriately evaluate the rigidity and proof stress of the column base and then perform a rational design.

According to the second aspect of the present invention, since the sleeve is integrated with the shaft portion of the anchor bolt by screwing, the fixing tube and the sleeve which are integrated by the tie material are embedded in the basic concrete, and then the anchor is adjusted while adjusting the level of the base plate. The bolt can be screwed into the sleeve, and the accuracy of construction of the column base can be improved.

According to a third aspect of the present invention, since a plurality of anchor bolts are arranged in the axial direction and the circumferential direction of the shaft portion and are arranged between the anchor bolts and the fixing tubes, all the connecting members can exert the resistance force evenly. In addition to this, it is also possible to change the yield strength for each one or a plurality of binders and to gradually yield the binder as a whole.

According to the present invention, the fixing hole is formed in a shape having a portion having a larger cross-sectional area on the inner side than the cross-sectional area on the front side in at least a part of the depth direction, and the fixing hole in the fixing hole is formed. By filling the filler around the pipe, when the filler receives pulling force from the anchor bolt and the fixing pipe to the surface side of the foundation concrete, the filler is locked to the existing concrete foundation inside the fixing hole. Therefore, in addition to the adhesive force with the inner peripheral surface of the fixing hole, it is possible to resist due to the bearing pressure between the locking portion and the existing concrete, and when installing the fixing device on the existing column base. The safety of the fixing tube from coming out of the fixing hole can be enhanced.

Particularly, in Claims 6 and 7, at least a part of the entire fixing hole in the depth direction extends from the surface side to the back side, and the cross-sectional area is gradually expanded. Because the basic concrete resists the pull-out force received from the filler in the region where it gradually expands from the outer edge of the locking portion of the filler to the surface side of the existing concrete, the safety of breaking the existing concrete is high.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a use state of a fixing device according to claim 2, wherein a sleeve is screwed to an anchor bolt.

FIG. 2 is a sectional view taken along line xx of FIG.

FIG. 3 is a vertical cross-sectional view showing a usage state of the fixing device according to claim 7;

FIG. 4 is a plan view of a portion of FIG.

FIG. 5 is a graph showing a pull-out force-deformation relationship between a column base of the present invention and a conventional column base.

FIG. 6 is a bending moment between the column base of the present invention and the conventional column base;
It is a graph showing a rotation angle relationship.

FIG. 7 is an elevational view showing a method of forming a section on the surface side of the fixing hole in FIG.

FIG. 8 is an elevational view showing a method of forming a section on the far side of the fixing hole in FIG.

[Explanation of symbols]

1 ... Fusing device, 2 ... Fusing tube, 2a ... Shear connector,
3 ... Anchor bolt, 4 ... Sleeve, 5 ... Binder, 6 ... Basic concrete, 6a ... Injection hole, 6b ... Discharge hole, 7 ... Fixing hole, 7a ... Locking part, 8 ... … Posts, 9…
… Base plate, 10… Nut, 11… Leveling mortar, 12… Filler, 13… Core tube, 13a… Cutting blade, 14… Bit, 14… Cutting blade, 14b… Rod, 15
…… Supporting member, 16 …… Drive device, 16a …… Drive shaft, 17…
…attachment.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hidekuni Hyokawa             1-13-1 Yamashita, Okayama City, Okayama Stock             Company Omotogumi F-term (reference) 2D046 AA17                 2E125 AA04 AA45 AB01 AB16 AB17                       AC29 AC30 AG03 AG43 BA02                       BA22 BB09 BB16 BB29 BB30                       BB36 BC09 BD01 BE04 BE08                       BF04 CA04 CA13 EA33

Claims (9)

[Claims] 1. A fixing device for fixing a base plate joined to a lower end of a column base to basic concrete, wherein the fixing pipe is fixed near the top end of the basic concrete and the base plate penetrates into the fixing pipe. An anchor bolt that is inserted at a distance from the peripheral surface and the head is fixed to the base plate, and is composed of a connecting material that connects the fixing tube with the sleeve that is integrated with the shaft portion of the anchor bolt or its periphery, A fixing device for a column base, in which the linking material yields and absorbs energy when the anchor bolt undergoes relative displacement in the axial direction exceeding a certain amount with respect to the fixing tube. 2. A fixing device for fixing a base plate joined to a lower end of a column base to basic concrete, wherein the fixing pipe is fixed near the top of the basic concrete and the base plate penetrates into the fixing pipe. Consists of an anchor bolt that is inserted at a distance from the peripheral surface and the head is fixed to the base plate, a sleeve that is integrated with the shaft of the anchor bolt by screwing, and a connecting material that connects the sleeve and the fixing tube. When the anchor bolt undergoes a relative displacement in the axial direction with respect to the fixing tube exceeding a certain amount, the connecting material yields and absorbs energy. 3. The pillar according to claim 1 or 2, wherein a plurality of connecting members are arranged between the anchor bolt and the fixing tube at intervals in the axial direction and the circumferential direction of the shaft portion of the anchor bolt. Leg fixing device. 4. The fixing pipe is fixed to a fixing hole formed from the top end of the foundation concrete, and the fixing hole has a cross-sectional area on the inner side larger than a cross-sectional area on the surface side in at least a part of the depth direction. The column base fixing device according to any one of claims 1 to 3, further comprising a portion, wherein the fixing material is filled around the fixing tube in the fixing hole. 5. The fixing hole is divided into a front side section and a rear side section, the front side section has a cylindrical shape, and the rear side section has a cylindrical shape having a diameter larger than that of the front side section. The fixing device for the pedestal according to claim 4. 6. The column base according to claim 4, wherein at least a part of the entire fixing hole in the depth direction has a shape in which the cross-sectional area gradually increases from the surface side to the back side. Fixing device. 7. The fixing hole is divided into a front-side section, a rear-side section, and an intermediate section thereof. The front-side section has a cylindrical shape, and the middle section has a truncated cone shape, and the rear-side section. 7. The fixing device for a column base according to claim 6, wherein said section has a cylindrical shape having a diameter larger than that of the section on the front surface side. 8. A fixing portion in which a column base is fixed to basic concrete by using the fixing device for a column base according to claim 1, and the head of an anchor bolt constituting the fixing device. Is the fixing part of the column base that is fixed to the base plate. 9. The fixing portion for a column base according to claim 8, wherein the head portion of the anchor bolt projects above the base plate and is fixed to the base plate by tightening a nut that is screwed onto the anchor plate from the base plate.