JP3702322B2 - Anchor bolt installation structure - Google Patents

Description

[0001]
[Industrial application fields]
TECHNICAL FIELD The present invention relates to an anchor bolt installation structure used for a steel column base for joining a steel column on the foundation concrete in a building construction using a steel column, and in particular, before being embedded in the foundation concrete. The present invention relates to an anchor bolt installation structure for anchor bolt installation.
[0002]
[Prior art]
As a method for joining a steel column used in a building to foundation concrete, there is a steel column base described in, for example, Japanese Patent Publication No. 2-14496. As shown in FIG. 13, the steel column base described in this gazette has a protruding portion 1a to be joined to the steel column 2 protruding upward, and a gradient is provided from the base portion 1b to the end portion 1c to end the base portion 1b. The column base metal 1 made of cast or forged made of high rigidity, which is higher than the portion 1c and can be welded (or bolted) to the steel column 2 at the protruding portion 1a, is used.
[0003]
The anchor bolt 7 is embedded in the foundation concrete 4 by providing an unconstrained portion 7b that eliminates the direct adhesion between the shaft portion 7a of the anchor bolt 7 and the foundation concrete 4, and the shaft portion 7a is unconstrained from the foundation concrete 4. In the state, it is embedded together with the anchor plate 8 (or anchor frame, fixing hardware).
[0004]
The column base 1 is fixed to the foundation concrete 4 by inserting anchor bolts 7 into the holes in the four corners of the column base 1 and tightening with the tightening nuts 10 to resist the bending moment applied to the steel column base. Therefore, the anchor bolt 7 is tightened to introduce a tension of 0.15 to 1.2 times the yield value to the anchor bolt 7 to improve the earthquake resistance.
[0005]
By using such a steel column base with a very high rigidity for the column base 1, the deformation of the column base 1 can be made extremely small when the column base receives a bending moment. The rotational deformation of the steel column base due to the can be made almost zero. In addition to using the column base metal 1 having such a high rigidity, the mechanical mechanism of the steel column base is simplified by providing the anchor bolt 7 with an unconstrained portion 7b that eliminates direct adhesion to the foundation concrete 4. It is possible to accurately grasp the data related to the rotational rigidity of the steel column base.
[0006]
Further, by providing the unconstrained portion 7b, a predetermined tension is introduced into the anchor bolt 7, and the anchor base 7 is fastened and fixed on the foundation concrete 4 by fastening the anchor bolt 7 and the fastening nut 10, and the tightening force is increased. A stable value can be secured over a long period of time, and the degree of fixation of the steel column base becomes large, and the rotational rigidity of the steel column base can be improved.
[0007]
In addition, when the anchor bolt 7 is directly embedded in the basic concrete 4 without providing the unconstrained portion 7b, when the tensile force is applied to the anchor bolt 7, the adhesion with the concrete is cut off from the upper portion of the anchor bolt 7, and as in an earthquake. When a tensile force is repeatedly applied to the anchor bolt 7, there is a tendency that the state where the adhesion is cut toward the lower portion of the anchor bolt 7 extends. For this reason, it is difficult to evaluate the seismic performance because the bending deformation behavior of the column base changes with repeated earthquakes.
[0008]
On the other hand, when the unconstrained portion 7b is provided on the anchor bolt 7, the tightening force of the tightening nut 10 directly reaches the anchor plate 8, so that the anchor bolt 7 is extended so that the elongation capacity of the anchor bolt 7 is increased. Since a column base having a stable restoring force against a repeated load can be obtained, the rotational deformation capacity of the column base is improved, and the seismic performance can be easily evaluated.
[0009]
In order to construct such steel column bases, it is necessary to embed anchor bolts in the foundation concrete. For that purpose, it is necessary to accurately position and install the anchor bolt so as to coincide with the fastening hole of the steel column base. In order to install such an anchor bolt 7 before embedding, the conventional method is shown in FIG. An anchor bolt installation structure as shown in FIG. 14 was used.
[0010]
In the anchor bolt installation structure shown in FIG. 14, before the discarded concrete 12 forming the bottom surface of the foundation concrete 4 is hardened, the lower ends of the reinforcing bars, embedded bolts, and the like are embedded in the discarded concrete 12 in advance. After solidifying, the lower end portion of the frame-like frame structure 15 is fixed to the exposed upper end portion 13 by welding or bolting or the like, and the anchor bolt 7 is supported by such a frame structure 15. Thus, the anchor bolt 7 is positioned and installed.
[0011]
Alternatively, the position of the frame structure 15 is measured, and the position is discarded and the surface of the concrete 12 is drawn with black ink to determine the position of the frame structure 15 that supports the anchor bolt 7. The lower end can be discarded and fixed on the concrete 12 by post-construction anchors or mortar consolidation.
[0012]
In this way, the anchor bolt 7 is installed so that the position of the anchor bolt 7 does not move due to the impact when the ready-mixed concrete forming the foundation concrete 4 is poured. Such a frame structure 15 is stretched in an oblique direction with tension members 17 such as wires and reinforcing bars applied to each side as necessary so that the frame structure 15 does not move easily. It is designed to be fixed.
[0013]
Such a frame structure 15 is assembled with a temporary material made of steel or the like in order to fix the anchor bolt 7 in a fixed position, and a simple horizontal member for holding the position of the anchor bolt 7; It has a configuration using reinforcing bars.
[0014]
[Problems to be solved by the invention]
By the way, a large number of reinforcing bars are arranged between and around the anchor bolts 7 and later form a part of the underground beam. However, in the conventional anchor bolt installation structure described above, As shown in FIG. 14, since the frame structure 15 has a complicated structure, the frame structure 15 becomes a hindrance when arranging the reinforcing bars constituting the underground beam. There was a problem that the workability of the construction to arrange the was reduced.
[0015]
Further, once the upper end portion of the anchor bolt 7 and the height position of the anchor plate 8 are set, the anchor bolt 7 is integrally fixed to the frame structure 15, and thereafter the height position is adjusted or changed. It has a structure that cannot. For this reason, the embedding depth of the anchor plate 8 provided on the anchor bolt 7 into the foundation concrete 4 (fixing depth of the anchor bolt 7) and the protruding length of the anchor bolt 7 from the foundation concrete 4 are set. In the end, there is a possibility that the optimal value cannot be set.
[0016]
The anchoring depth of the anchor bolt 7 is determined in consideration of the elasticity when the anchor bolt 7 is pulled, and the protruding length of the upper end of the anchor bolt 7 from the basic concrete is a tightening nut or the like when the anchor bolt 7 is short. Since a sufficient screw coupling length cannot be obtained for the locking nut, the screw fastening force may be insufficient or the screw fastening may be loosened. For this reason, there has been a problem that the performance of the steel column base may be impaired because the fixing depth and the protruding length cannot be finally set to optimum values.
[0017]
Therefore, the present invention makes it easy to arrange a large number of rebars used for foundation beams etc. in the vicinity of the anchor bolt with a simple configuration, and easily adjusts the anchor bolt fixing depth and the upper end height position during construction. It is an object of the present invention to provide an anchor bolt installation structure that can be changed.
[0018]
[Means for Solving the Problems]
In order to solve the above problems, the anchor bolt installation structure according to the present invention has the following configuration.
[0019]
(1) An anchor bolt in which a male screw is formed in the lower end portion in addition to the upper end portion, and a pipe member which is arranged so as to be fitted to a portion other than the upper end portion of the anchor bolt and in which a male screw is formed in the lower end portion. The cylinder member is arranged to stand on the discarded concrete and has a male screw formed at the upper end thereof, and is arranged between the anchor bolt and the pipe member and the column member, and the fixing plate portion is formed outside. The anchor bolt and a female screw to which the male screw at the lower end portion of the tube member is screw-coupled, and an intermediate connecting member having a female screw to which the male screw at the upper end portion of the columnar member is screw-coupled. Then, each of the members is assembled and erected, so that the anchor bolt is discarded and installed on the concrete.
[0020]
(2) In the above means (1), a male screw is also formed at the lower end of the cylindrical member, and this male screw is screwed to a female screw formed on a support member fixed on the concrete.
[0021]
(3) In the above-mentioned means (1) or (2), a horizontal member is provided that is positioned in the lateral direction and fixed to at least the pipe member, thereby positioning the plurality of anchor bolts.
[0022]
[Action]
According to the anchor bolt installation structure configured as described in the above means (1), the intermediate connecting member is arranged between the anchor bolt and the pipe member embedded in the foundation concrete and the column member provided on the discarded concrete. And, since this intermediate connecting member is connected to the male screw at the lower end portion of the anchor bolt and the pipe member, and the male screw at the upper end portion of the columnar member and connected, by rotating any of the members, The height position of the upper end portion of the anchor bolt and the embedding depth position of the fixing plate portion of the intermediate connecting member can be easily adjusted and changed during the construction.
[0023]
For this reason, the embedding depth of the fixing plate portion of the intermediate connecting member in the basic concrete and the protruding length of the anchor bolt upper end portion from the basic concrete can be finally set to the optimum values reliably. Leg performance can be maximized.
[0024]
Further, according to the anchor bolt installation structure configured as in the above means (2), a male screw is also formed at the lower end portion of the columnar member whose upper end portion is coupled to the intermediate connecting member by screw connection. Is screwed together with the female screw of the support member fixed on the concrete, so that the degree of freedom of vertical adjustment of each member can be further increased.
[0025]
Furthermore, according to the anchor bolt installation structure configured as in the above means (3), the anchor member is fixed to each of the pipe members fitted to the adjacent anchor bolts by fixing the transverse member disposed in the lateral direction. Since it is the structure which positions between bolts, it is not necessary to use a complicated frame structure like the past. For this reason, when the reinforcing bars constituting the underground beam are arranged in the vicinity of the anchor bolt, they are not disturbed as in the conventional frame structure, so that the workability of the construction of arranging the reinforcing bars can be improved. it can.
[0026]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
1 to 6 are views showing a first embodiment of an anchor bolt installation structure according to the present invention.
[0027]
In FIG. 1, reference numeral 27 denotes an anchor bolt, and a pipe member 29 made of a steel material is fitted to a portion excluding the upper end portion of the anchor bolt 27. The anchor bolt 27 is formed with a male screw at the lower end portion in addition to the upper end portion, and a male screw is also formed at the lower end portion of the pipe member 29.
[0028]
A pipe member (cylindrical member) 31 similar to the pipe member 29 is erected on the discarded concrete 32, and male screws are formed at both upper and lower ends of the cylindrical member 31. An intermediate connecting member 34 is provided between the lower ends of the anchor bolt 27 and the pipe member 29 and the upper end of the column member 31.
[0029]
As shown in FIG. 2, a disk-shaped fixing plate portion 34 a is formed outside the intermediate connecting member 34. Further, as shown in FIG. 1, an inverted conical tapered shape 34e is formed on the lower surface of the fixing plate portion 34a.
[0030]
As shown in FIG. 3, on the inner side of the intermediate connecting member 34, a female screw 34 b to which a male screw at the lower end portion of the anchor bolt 27 is screw-coupled, and a female screw 34 c to which a male screw at the lower end portion of the tube member 29 is screw-coupled. Furthermore, a female screw 34d is formed in which the male screw at the upper end of the cylindrical member 31 is screw-coupled.
[0031]
As shown in FIG. 4, a support member 36 having a female screw formed on the inside is fixed on the discarded concrete 32 by screwing a post-installed anchor 35 and an anchor bolt 33 as fixing means. The male screw at the lower end of the cylindrical member 31 is screw-coupled with the female screw of the support member 36, so that the cylindrical member 31 is disposed on the concrete 32, and the anchor bolt 27 and the pipe member 29 are disposed as shown in FIG. The intermediate connecting member 34 and the columnar member 31 are all discarded and supported on the concrete 32.
[0032]
As shown in FIG. 5, both ends of a horizontal member 38 arranged in the lateral direction are fixed to the upper ends of the pipe members 29 of a pair of anchor bolts 27 adjacent to each other by welding. Positioning between each other. In addition, both ends of the horizontal member 38 are fixed to the columnar members 31 of the adjacent anchor bolts 27, and two reinforcing bars 40 crossing in the X shape at both ends of the two upper and lower horizontal members 38. Both ends are fixed by welding to reinforce the assembly.
[0033]
Such a horizontal member 38 may use any form of material as long as it is a steel material such as a pipe material, a plate material, a square material, a rectangular material, and a deformed steel bar. Further, the steel bar 40 may use any form of steel material such as a round bar or an L-shaped angle material.
[0034]
As shown in FIG. 6, four anchor bolts 27 used for a steel column base (not shown) are provided, and between each adjacent anchor bolt 27, two horizontal bridges as shown in FIG. A member 38 and two reinforcing bars 40 are provided.
[0035]
With such an anchor bolt installation structure according to the first embodiment, the anchor bolt 27 is positioned and installed so as not to move easily, and then embedded in the foundation concrete 4 and protrudes from the upper surface of the foundation concrete 4. The column base 1 shown in FIG. 13 is fixed to the male screw at the upper end of the anchor bolt 27 by the tightening nut 10.
[0036]
In this first embodiment, the pipe member 29 corresponds to the unconstrained portion 7b of the conventional anchor bolt 7, and the fixing plate portion 34a of the intermediate connecting member 34 corresponds to the conventional anchor plate 8 (see FIG. 13). Responsible for the function.
[0037]
According to such an anchor bolt installation structure, positioning and installation between the anchor bolts 27 can be performed with a very simple configuration without using the complicated frame structure 15 as shown in FIG. Can do. For this reason, when arranging the reinforcing bars constituting the underground beam in the vicinity of the anchor bolt 27, there is no hindrance as in the conventional frame structure, and the workability of the construction of arranging the reinforcing bars can be improved. it can.
[0038]
Further, since the male screw at the lower end portion of the anchor bolt 27 and the tube member 29 and the male screw at the upper end portion of the column member 31 are connected to the female screws 34b, 34c, 34d of the intermediate connecting member 34 by screw connection, By rotating any one of the members, the upper end portion of the anchor bolt 27 and the intermediate connecting member 34 can be moved up and down to adjust the height position thereof.
[0039]
As shown in FIGS. 5 and 6, the anchor bolt 27 can be rotated even after the horizontal member 38 and the reinforcing bar 40 are provided and the assembly between the anchor bolts 27 is completed. The height position of the upper end can be easily adjusted. Further, if the direction and pitch of each screw are the same, only the intermediate connecting member 34 can be moved up and down by rotation while the height position of the upper end portion of the anchor bolt 27 remains unchanged.
[0040]
For this reason, the embedding depth of the intermediate connecting member 34 in the basic concrete 4 and the protruding length of the upper end portion of the anchor bolt 27 from the basic concrete 4 can be finally set to the optimum values with certainty. Leg performance can be maximized.
[0041]
Also, unlike the conventional framework structure 15 (see FIG. 14), since each component can be transported to the site and an anchor bolt installation structure can be easily assembled at the site, its transportation is very easy. Therefore, it can be transported in large quantities at the same time.
[0042]
FIG. 7 is a diagram showing a second embodiment of the present invention. In the first embodiment, as shown in FIG. 5, the reinforcing bars 40 are provided between the adjacent anchor bolts 27. In the second embodiment, as shown in FIG. The difference is that the reinforcing bars 40a are provided diagonally between the bolts 27.
[0043]
According to such a 2nd Example, the reinforcement of an assembly can be performed by the said reinforcing bar 40a.
[0044]
FIG. 8 is a diagram showing a third embodiment of the present invention. In the first embodiment, two horizontal members 38 are used as shown in FIG. 5, whereas in this third embodiment, a horizontal member 38 is provided between the adjacent intermediate connecting members 34. In addition, a horizontal member 38 is provided between the adjacent support members 36, and a total of three horizontal members 38 are provided between the adjacent anchor bolts 27. Two reinforcing bars 40 are provided in an X shape between the first and second horizontal members 38 from above, and two reinforcing bars 40 are provided in an X shape between the second and third horizontal members 38. ing.
[0045]
According to the third embodiment, the intermediate connecting member 34 can be used for fixing the horizontal member 38, and the support member 36 can also be used for fixing the horizontal member 38. And the assembly strength can be improved without increasing so much by increasing the number of the horizontal members 38 and the reinforcing bars 40.
[0046]
FIG. 9 is a diagram showing a fourth embodiment of the present invention. In the first and second embodiments, four anchor bolts 27 are used. In the fourth embodiment, eight anchor bolts 27 are used. In the fourth embodiment, a horizontal member 38 is provided between adjacent anchor bolts 27, and reinforcing reinforcing bars 40b are provided between anchor bolts 27a in the middle of the anchor bolts 27 at the four corners.
[0047]
According to such a 4th Example, even if the number of anchor bolts increases, the installation structure does not become complicated for that, and it can implement | achieve with a simple structure. Further, in this case, as shown in FIG. 10, the anchor bolts 27 at the four corners are discarded on the concrete 32 by the pipe member 29, the column member 31, the intermediate connecting member 34, and the support member 36, and the intermediate anchor bolt 27a is a column member. 31 and the support member 36 can be omitted, and the structure can be simplified as much as possible by joining the tube member 29 (or the intermediate connecting member 34) standing at the four corners by the horizontal member 38.
[0048]
FIG. 11 is a diagram showing a fifth embodiment of the present invention. In the above embodiment, the horizontal member 38 is fixed directly to the tube member 29 and the column member 31 by welding, whereas in the fifth embodiment, the plate member 44 is attached to the tube member 29 and the column member 31. The base is fixed vertically by welding, and the flat portion at the end of the horizontal member 38 is fixed to the plate member 44 by welding.
[0049]
According to the fifth embodiment, the end of the horizontal member 38 can be easily welded to the pipe member 29 or the like via the plate member 44.
[0050]
FIG. 12 shows the sixth embodiment of the present invention. In the sixth embodiment, the plate-like portion at the end of the horizontal member 38 is fixed to the plate member 44 provided on the pipe member 29 or the like by the bolt and nut fastening means 46 instead of welding as in the fifth embodiment. It is.
[0051]
According to such a 6th Example, the edge part of the horizontal member 38 can be fixed more easily than welding.
[0052]
In the above-described embodiment, the cylindrical member 31 and the support member 36 are configured as separate members that are screw-coupled to each other. However, both the members may be integrally configured as a single member.
[0053]
Moreover, in the said Example, although the cylindrical member 31, the support member 36, and the intermediate | middle connection member 34 were comprised as a mutually separate member, you may make these members integrally comprise as a single member.
[0054]
Moreover, in the said Example, although what provided the pipe member 29 for avoiding a direct contact with an anchor bolt and foundation concrete was demonstrated, this invention is an anchor bolt of the system which does not use such a pipe member 29. FIG. It can also be used for installation.
[0055]
Moreover, in the said Example, although the supporting member 36 was thrown away and it fixed to the concrete 32 using the post-installed anchor 35 and the anchor bolt 33, before the discarded concrete 32 hardens | cures, members, such as a reinforcing bar and an embedded bolt, are beforehand. After the lower end portion is embedded so that the upper end portion is exposed and the discarded concrete 32 is solidified, the support member 36 may be fixed to the exposed upper end portion by welding or bolt connection, or the peripheral portion of the support member 36 May be fixed by so-called root hardening or the like, which is solidified with mortar. Further, the support member 36 may be fixed by a high-speed striking gun such as a drive-it (trade name).
[0056]
【The invention's effect】
As described above, according to the anchor bolt installation structure of the present invention, the intermediate connecting member is disposed between the anchor bolt and the pipe member embedded in the foundation concrete and the column member provided on the discarded concrete. The intermediate connecting member is connected to the male screw at the lower end portion of the anchor bolt and the pipe member and the male screw at the upper end portion of the cylindrical member. It is possible to easily adjust and change the height position of the upper end portion of the bolt and the embedding depth position of the fixing plate portion of the intermediate connecting member during the construction.
[0057]
For this reason, the embedding depth of the fixing plate portion of the intermediate connecting member in the basic concrete and the protruding length of the anchor bolt upper end portion from the basic concrete can be finally set to the optimum values reliably. Leg performance can be maximized.
[0058]
In addition, a male screw is also formed at the lower end of the cylindrical member, and this male screw is screwed to the female screw of the support member fixed on the concrete, thereby increasing the degree of freedom of vertical adjustment of each member. Can do.
[0059]
In addition, the structure is such that positioning between the anchor bolts is performed by fixing a laterally arranged horizontal member to each of the pipe members fitted to the adjacent anchor bolts. There is no need to use a structure. For this reason, when arrange | positioning the reinforcing bar which comprises an underground beam, it does not become obstructive like the conventional frame structure, Therefore The workability | operativity of the construction which arrange | positions a reinforcing bar can be improved.
[0060]
Moreover, in the said Example, since the pipe member 29 and the column member 31 are integrated by screwing together with the intermediate | middle connection member 34, it is stable, the rigidity of the anchor bolt installation structure can be ensured, and the precision is also ensured. be able to.
[0061]
Further, unlike the conventional frame structure 15, only the parts can be transported to the site, and the anchor bolt installation structure can be easily assembled on site, so that the transport is very easy, and therefore a large amount is transported at the same time. It becomes possible to do.
[0062]
Further, in the above-described embodiment, since the tapered shape 34e is formed on the lower surface of the fixing plate portion 34a of the intermediate connecting member 34, when the ready-mixed concrete forming the foundation concrete is poured, the lower surface side of the fixing plate portion 34a. It is possible to prevent the ready-mixed concrete from flowing smoothly and forming a gap at the corner of the lower surface of the fixing plate 34a.
[Brief description of the drawings]
FIG. 1 is a left side cutaway side view showing a first embodiment of an anchor bolt installation structure according to the present invention.
2 is a cross-sectional view taken along the line II-II of the anchor bolt installation structure shown in FIG.
3 is a partial longitudinal sectional view including an intermediate connecting member 34 of the anchor bolt installation structure shown in FIG. 1; FIG.
4 is a partial longitudinal sectional view including a support member 36 of the anchor bolt installation structure shown in FIG. 1; FIG.
5 is a side view showing a state where the anchor bolt installation structure shown in FIG. 1 is assembled with respect to a plurality of anchor bolts. FIG.
6 is a top view of a plurality of anchor bolts assembled to each other shown in FIG. 5;
FIG. 7 is a top view showing a second embodiment of the anchor bolt installation structure according to the present invention.
FIG. 8 is a side view showing a third embodiment of the anchor bolt installation structure according to the present invention.
FIG. 9 is a top view showing a fourth embodiment of the anchor bolt installation structure according to the present invention.
FIG. 10 is a side view showing a fourth embodiment of the anchor bolt installation structure according to the present invention.
FIG. 11 is a partially enlarged view showing a fifth embodiment of the anchor bolt installation structure according to the present invention.
FIG. 12 is a partially enlarged view showing a sixth embodiment of the anchor bolt installation structure according to the present invention.
FIG. 13 is a side view showing a conventional steel column base.
FIG. 14 is a side view showing a conventional anchor bolt installation structure.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Column base 1a Protrusion part 1b Base part 1c End part 2 Steel column 4 Basic concrete 7,27 Anchor bolt 7a Shaft part 7b Unrestrained part 8 Anchor plate 10 Tightening nut 12,32 Discard concrete 13 Exposed upper end part 15 Frame structure 17 Tension member 29 Pipe member 31 Column member 33 Anchor bolt 34 Intermediate connecting member 34a Fixing plate portions 34b, 34c, 34d Female thread 34e Taper shape 35 Post-installed anchor 36 Support member 38 Horizontal member 40 Reinforcing bar 44 Plate member 46 Bolt nut fastening means

Claims (3)

An anchor bolt in which a male screw is formed at the lower end in addition to the upper end,
A pipe member that is arranged to fit in a portion other than the upper end portion of the anchor bolt and has a male screw formed at the lower end portion;
A columnar member that is arranged to stand on abandoned concrete and has an external thread formed at the upper end;
A female screw disposed between the anchor bolt and the tube member and the columnar member, a fixing plate portion is formed on the outer side, and a male screw at a lower end portion of the anchor bolt and the pipe member is screwed on the inner side; An intermediate coupling member formed with a female screw to which a male screw at the upper end of the cylindrical member is screw-coupled;
An anchor bolt installation structure characterized in that the anchor bolts are discarded and installed on concrete by assembling the respective members upright. The anchor according to claim 1, wherein a male screw is also formed at a lower end portion of the cylindrical member, and the male screw is screwed to a female screw formed on a support member fixed on concrete. Bolt installation structure. The anchor according to claim 1 or 2, further comprising a transverse member that is disposed in a lateral direction and fixed to at least the pipe member to perform positioning between the plurality of anchor bolts. Bolt installation structure.

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