JP3233260B2 - Anchoring structure of anchor material on steel column base - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anchoring structure for an anchor material on a steel column base of a steel frame in civil engineering, construction or a work.

[0002]

2. Description of the Related Art As shown in FIG. 24, a column base, which has been widely used in the past, has a base plate 3 fixed below a steel column 2 and an anchor bolt 4 previously embedded in a foundation concrete 1 is attached to the base plate. Generally, a method is used in which the column 2 and the foundation concrete 1 are fixed by fitting into a bolt hole previously drilled in the base plate 3 and tightening the nut 5A only from the upper surface of the base plate 3.

Prior to erecting the column 2 on the anchor bolt 4, a nut 5B is mounted on the anchor bolt 4 in advance to determine the position in the height direction, and after the base plate 3 is fitted, each bolt 4 is removed. A method is used in which the nuts 5A and 5B are tightened from the upper surface of the base plate 3 and the nuts 5A and 5B are tightened through the so-called base plate 3.

[0004]

A method of fixing the anchor bolt 4 to the base plate 3 from above and below using nuts 5A and 5B (see FIG. 24), or FIG.
As shown in FIG. 5, a method of fixing an anchor bolt 4 to a base plate 3 by welding 6 or the like is known. However, these known methods have the following problems.

(1) The vertical load applied to the column base acts as a compressive force on these anchor members. in this case,
The anchoring mechanism, which assumes that the anchor material functions with respect to the conventional tensile force, expects the adhesive force between the anchor material and the concrete, and ultimately the bent portion at the lower end of the anchor material or the upward direction of the fixing plate provided at the lower end It is assumed that the concrete bearing capacity is to resist the anchor material from sinking in, and the stress transmission when compressive force is applied to the anchor material has not been clarified. According to this conventional concept, there is a problem in terms of safety as a fixing device for applying a compressive force to the anchor bolt.

(2) When a bending moment is generated in the column base, the anchor bolt group bears the bending moment. In this case, one side bears the tensile force and the other side bears the compressive force with respect to the central axis of the bending stress of the anchor bolt group, and the anchoring strength of the two cooperates to satisfy the function of the bending strength of the anchor bolt group. You. Since the bending moment applied to the column base becomes an alternating stress during an earthquake, each anchor bolt must have a function of withstanding the stress because tension and compression are applied alternately. With respect to the anchoring of the conventional anchor bolt, the idea that the anchor bolt works against the tensile force has been established, so that it cannot be said that the consideration for the alternating stress is sufficient.

(3) The anchor bolt is installed at a predetermined position prior to the concrete placement. However, the anchoring structure for temporarily supporting the anchor bolt group is moved so that the positioning accuracy is not deviated. Assemble and embed this in concrete. In addition, using a form for concrete placement on the upper part of the foundation, the upper position of the bolt group is fixed using lumber or a template, and concrete is placed with the anchor bolts suspended. These anchor bolt installation devices and methods are:
Although it requires labor and cost in construction, it does not contribute to the proof stress in design.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide an anchoring structure for an anchor material having a sufficient load-bearing function against alternating tensile and compressive stresses applied to the anchor material of a steel column base. .

[0009]

According to the anchoring structure of an anchor material in a steel column base according to the present invention, anchor bolts at at least four corners are vertically extended to a bottom surface of a foundation and fixed to a discarded concrete previously poured into the bottom surface of the foundation. The lower end of the anchor bolt is fixed to the fixed metal fitting, the bearing metal is fixed to the intermediate part of the anchor bolt, and a base plate is supported on the upper part of the anchor bolt, and the fixed metal fitting and the supporting metal are cast or formed. It is a forged product, consisting of a cylindrical portion, a flange, and a rib that straddles the cylindrical portion and the flange, and a screw that is screwed with the screw of the anchor bolt is formed on the inner peripheral surface of the cylindrical portion. Has a mounting hole for connecting the reinforcing member, and a bolt hole for fixing the concrete to the waste concrete is formed in the flange.

[0010]

[0011]

[0012]

[0013]

Further, according to the present invention, the supporting hardware and the fixing hardware and the supporting hardware are connected to each other by the reinforcing material.

Further, according to the present invention, the supporting members are connected to each other and the supporting base supporting the base plate and the supporting member are connected by the reinforcing member.

[0016]

Further, according to the present invention, the vertical length of the anchor bolt can be finely adjusted by screwing the screw of the anchor bolt to the screw of the fixing hardware.

The bearing metal provided in the middle of the vertical shaft portion of the anchor bolt effectively acts on concrete in the event of a cone-shaped destruction with the bearing metal at the top. Considering the cone-shaped fracture surface, a large surface area is necessary for proof stress, and since the bearing metal is fixed to the bolt shaft against the compressive force, safety against the fixing proof force is secured. .

[0019]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, fixing hardware 13 corresponding to the anchor bolts 4 at the four corners is fastened to the discarded concrete 11 previously cast on the base bottom surface 10 by means of fastening bolts 12 or the like.
Is fixed. The anchor bolts 4 at the four corners are vertically extended to the base bottom surface 10, and the lower ends thereof are fixed to the fixing hardware 13. In addition, the bearing metal 14 is fixed to an intermediate portion of the anchor bolt 4. A base plate 3 fixed to the lower end of a steel column (not shown) by welding or the like is supported at the tip end of the anchor bolt 4 by a pedestal and a nut 5A. 5B, the base plate 3 is clamped and supported.

In the example shown in FIG. 1, the fixing hardware 13 and the bearing metal 14 are made by casting or forging, which will be described in detail later, and a screw is formed in a cylindrical portion thereof. The screw 9 formed at the lower end and the intermediate portion of the bolt 4 is fixed to the anchor bolt 4 by screwing. A screw 9 formed at the tip of the anchor bolt 4 is a screw into which nuts 5A and 5B for fixing the base plate 3 are screwed.

The supporting hardware 14 and the fixing hardware 13 and the supporting hardware 14 are connected to each other by a reinforcing member 15, so that the anchor bolts 4 can be positioned relative to each other and the horizontal force due to concrete casting or the like can be prevented. Has stabilized. Rising steel bars and hoop bars (not shown) are arranged around the anchor bolts 4 arranged in this manner, and concrete is cast to construct a steel column base.

FIG. 3 shows an example in which the supporting members 14 and the receiving base 16 for supporting the base plate 3 and the supporting member 14 are connected to each other with a reinforcing member 15 for reinforcement.

FIG. 1 shows a structure in which one anchor 14 is provided on one anchor bolt 4. This bearing 14 is, as shown in FIG. It can be provided in multiple stages according to the requirements.

FIG. 4 and FIG. 5 show a fixed metal part 13 and a supporting metal part 14 made of casting.
It comprises a cylindrical portion 21 and a rib 23 extending over the flange 22.
The rib 23 has a mounting hole 25 for connecting the reinforcing member 15, and the flange 22 has a bolt hole 26 for fixing to the discarded concrete 11. ing. The rib 23 also serves as a stiffener for the out-of-plane bending of the support metal 14. This part may be used as the receiving base 16.

FIG. 6 shows a structure in which the bearing metal 14A is formed integrally with the anchor bolt 4 by hot forming such as high frequency. FIG. 7 shows a base plate receiving base 16A formed integrally with the anchor bolt 4 by hot forming instead of the lower nut 5B supporting the base plate 3 shown in FIG.

FIG. 8 shows the most practical one, in which a circular plate body 31 having a bolt insertion hole formed in the center is groove-welded 32 to an anchor bolt 4 to form a bearing metal 14B. FIGS. 9 to 11 each include a cylindrical portion 41 having a bolt insertion hole 43 at the center and a flange 42, a groove 44 for groove welding is formed in the cylindrical portion 41, and a fillet weld 45 and The groove welding 46 is used as the bearing metal 14C.

FIGS. 12 and 13 show another example of the fixing hardware. The fixing hardware 13A is formed by fillet welding 53 a pipe 51 and a pedestal 52, and an anchor bolt 4 is provided on the inner peripheral surface of the pipe 51. A screw 54 to which the screw 9 is screwed is formed, and a bolt hole 55 for fixing to the discarded concrete 11 is formed in the pedestal 52. As for the fixing fitting of this example or the fixing fitting shown in FIG. 5 which is screwed to the screw of the anchor bolt 4, the vertical length of the anchor bolt 4 can be finely adjusted as shown in FIG.

FIGS. 15 to 17 show an embodiment in which the fixing bracket 13 is fixed to the discarded concrete 11. In FIG. 15, the steel rod 61 embedded in the discarded concrete 11 is fixed.
Is welded 62 to the base. In FIG. 16, it is fixed by an anchor bolt 63. In FIG. 17, the periphery of the pedestal is fixed with a mortar 64.

FIG. 18 shows a method of positioning the fixed hardware on the discarded concrete. A hole 71 for confirming the center is formed on the discarded concrete 11, and the fixed hardware 13 are fixed to each other with a flute bar 72 or the like serving as a ruler. Then, the fixing hardware 13 is fixed to the discarded concrete 11 in the manner shown in FIGS.

FIG. 19 shows a wire mesh 80 for reinforcing concrete and positioning an anchor bolt, which is fixed to the anchor bolt 4 by welding or the like.

FIG. 20 shows a steel pipe on the outside of the anchor bolt 4,
The anchor bolts 4 are unbonded from the concrete by inserting a PVC pipe 91 or the like, thereby preventing the initial cracks generated around the anchor bolts from being generated in the concrete and preventing the foundation concrete from having a stable strength.

FIG. 21 shows a steel rod 92 having a spiral shape inserted into the outside of the anchor bolt 4. This spiral has an effect of restraining the concrete bolt axis in the horizontal direction. When a reinforcing bar or the like is used for the bolt, the adhesive strength increases, which effectively acts on initial cracks.

In FIG. 22, when a bending moment in the direction of the arrow is generated on the column base 2, a tensile force indicated by an arrow acts on the left anchor bolt 4, and a compressive force indicated by the arrow acts on the right anchor bolt 4. . In response to the tensile force and the compressive force applied to the anchor bolt 4, providing a fixing plate at a deep portion of a large concrete volume to transmit and fix the stress is because concrete has a large compressive strength and a high shear / tensile strength. This is a reasonable method for small materials.

Accordingly, the provision of the supporting metal 14 in the middle of the vertical shaft portion of the anchor bolt 4 effectively acts on concrete in the event that the concrete eventually breaks in a cone shape having the supporting metal at the top. Considering the cone-shaped fracture surface A,
It is necessary for the bearing surface to have a large surface area, and the supporting metal is fixed to the bolt shaft against the compressive force.
Safety against fixing resistance is ensured.

FIG. 23 shows the ultimate fracture surface A when the anchor bolt 4 is provided with a plurality of bearing members 14.

[0036]

The effect of transmitting and fixing the stress to the deep part of the concrete volume with respect to the tensile force and the compressive force applied to the anchor bolt is because the concrete has a large compressive strength and a post-shear / tensile strength shift. This is a reasonable method for loading materials.

Accordingly, the provision of the supporting hardware in the middle of the vertical shaft portion of the anchor bolt effectively acts on concrete in the event that the concrete eventually breaks in a cone shape having the supporting hardware at the top. Considering the cone-shaped fracture surface, a large surface area is necessary for proof stress, and since the bearing metal is fixed to the bolt shaft against the compressive force, safety against the fixing proof force is secured. Things.

Further, if the fixing metal, the supporting metal, and the base plate supporting portion above the anchor bolt are fixed at the nodes with the reinforcing material, the frame becomes stable only with the anchor bolt, and the conventional supporting structure is not required. Not only cost is reduced, but also reinforcement of the foundation becomes easier.

[Brief description of the drawings]

FIG. 1 is a front view of a steel column base according to an embodiment of the present invention.

FIG. 2 is a front view of an anchor bolt provided with supporting metal members in multiple stages.

FIG. 3 is a front view showing an example in which bearing members are connected to each other and the bearing member, a fixing member, and a receiving pedestal are connected by a reinforcing material.

FIG. 4 is a front view showing a part of a fixed metal part (supporting metal part) made by casting in cross section.

FIG. 5 is a plan view of the fixed hardware (supporting hardware) of FIG. 4;

FIG. 6 is a front view of a bearing metal hot-formed on the anchor bolt.

FIG. 7 is a front view of a receiving pedestal hot-formed on the anchor bolt.

FIG. 8 is a front view of a supporting metal member made of a flat plate welded to an anchor bolt.

FIG. 9 is a front view of a supporting metal member formed of a flat plate having a cylindrical portion welded to an anchor bolt.

FIG. 10 is a plan view of the supporting metal member of FIG. 9 as viewed from above.

FIG. 11 is a plan view of the support metal of FIG. 9 as viewed from below.

FIG. 12 is a front view showing a part of a fixed metal part obtained by welding a pipe and a base in a plane.

FIG. 13 is a plan view of the fixing hardware of FIG. 12 viewed from above.

FIG. 14 is a front view showing a vertically adjustable anchor bolt and fixing hardware.

FIG. 15 is a front view showing a method of fixing the fixing hardware.

FIG. 16 is a front view showing another fixing method of the fixing hardware.

FIG. 17 is a front view showing still another fixing method of the fixing hardware.

FIG. 18 is a perspective view showing a method for positioning a fixing hardware.

FIG. 19 is a front view of a steel column base using a wire mesh for reinforcing and positioning an anchor bolt.

FIG. 20 is a front view in which a steel pipe and a PVC pipe are inserted into anchor bolts.

FIG. 21 is a front view in which a helical steel bar is inserted into an anchor bolt.

FIG. 22 is an explanatory view showing a cone-shaped fracture surface with respect to a bending moment in an anchor bolt to which a bearing metal is fixed.

FIG. 23 is an explanatory view corresponding to FIG. 22 of an anchor bolt provided with a number of supporting hardware.

FIG. 24 is a front view of a conventional steel column base.

FIG. 25 is a front view showing another example of the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 3 ... Base plate 4 ... Anchor bolt 5A, 5B ... Nut 9 ... Screw 10 ... Ground 11 ... Discarded concrete 12 ... Bolt 13 ... Fixed hardware 14 ... Support Pressed metal 15 ・ ・ ・ Reinforcement material 16 ・ ・ ・ Receiver base

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kuniaki Sato 24-21 Yaesaki-cho, Hiratsuka-shi, Kanagawa (72) Inventor Yoshihiro Nakamura 5-1-3-506, Ochiai 5-1-506, Tama-shi, Tokyo (72) Invention Person Akio Tomita 4-3-15 Kita-karasuyama, Setagaya-ku, Tokyo (72) Inventor Hidenori Tanaka 2-4-2, Toyo, Koto-ku, Tokyo Inside Hitachi Koki Co., Ltd. (72) Inventor Michio Ito 1-9-1 Kitahama, Wakamatsu-ku, Kitakyushu-shi, Fukuoka Hitachi Metals, Ltd. Wakamatsu Plant (56) References JP-A-8-226132 (JP, A) JP-A-8-49306 (JP, A) JP-A-5 JP-A-214731 (JP, A) JP-A-58-73640 (JP, A) JP-A-7-197600 (JP, A) JP-A-5-272144 (JP, A) JP-A-5-40335 (JP, U) (58) Fields surveyed (Int. Cl. ⁷ , DB name) E02D 27/00 E04B 1/24

Claims (4)

(57) [Claims] 1. An anchor bolt at least at four corners is vertically extended to a bottom surface of a foundation, and a lower end of the anchor bolt is fixed to a fixing hardware fixed to a discarded concrete which has been previously cast on the bottom surface of the foundation. A supporting plate is fixed, and a base plate is supported on an anchor bolt. The fixing member and the supporting member are made of casting or forging, and have a cylindrical portion, a flange, and a rib extending over the cylindrical portion and the flange. And a screw that is screwed with the screw of the anchor bolt is formed on the inner peripheral surface of the cylindrical portion,
An anchor anchoring structure for a steel column base, wherein a mounting hole for connecting a reinforcing material is formed in the rib, and a bolt hole for fixing the concrete to the waste concrete is formed in the flange. 2. The anchoring structure for an anchor material in a steel column base according to claim 1, wherein the supporting hardware and the fixing hardware and the supporting hardware are connected by a reinforcing material. 3. An anchor in a steel column base according to claim 1, wherein the bearing members are connected with each other and between the bearing base for supporting the base plate and the bearing member by a reinforcing material. Material fixing structure. 4. The steel column base according to claim 1, wherein the vertical length of the anchor bolt can be finely adjusted by screwing the screw of the anchor bolt to the screw of the fixing hardware. Anchor anchoring structure.