JP2017020312A - Steel column leg - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a steel column leg capable of assuring a horizontal joint surface of a steel column to a top end of a base post when a base concrete is installed, with a degree of fixation being raised.SOLUTION: A steel column leg includes a base concrete 21, an anchor bolt 22, and a template 23. A threaded portion of a plurality of anchor bolts 22 provided upright is provided with lower nuts 24a, 24b which are a reference of height, and further, a bolt hole 231 provided at the template 23 is inserted. Horizontality is adjusted and assured with the lower nuts 24a, 24b. A concrete is installed in such a manner as an upper surface of the template 23 and a top end of the base concrete 21 are aligned at the same height, for integration. A base plate 32 fitted to a lower end of a square steel pipe 31 is jointed to the upper surface of the embedded template 23.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a steel column base using a template.

A conventional steel column base is composed of a foundation column and a steel column, and a joint is generated due to a difference in structure, and is generally bolted. In addition, the bolt connection means that the anchor bolt is secured with a template to secure the position and height accuracy of the anchor bolt, and then the foundation concrete is placed and integrated into the anchor bolt. This is a joining method in which a bolt hole of a base plate attached to the lower end of a steel pipe or the like is inserted and fixed with a nut.

  In addition, it is difficult to place the foundation concrete with all the top ends of the foundation pillars aligned horizontally at the same height, which inevitably causes errors and unevenness. Therefore, as shown in FIG. 3, after the foundation concrete 21 is placed, a non-shrinking mortar (hereinafter referred to as “manju”), which serves as a reference for the height of the steel column 3, is provided at the top of the foundation concrete 21. In general, the steel column 3 is built on the bun 51, and the space between the steel column 3 and the foundation column 2 is filled with a soft, non-shrinkable mortar 52.

  Then, the template (not shown) has a bolt hole through which the anchor bolt is inserted, is a thin plate-shaped template made of steel for positioning the anchor bolt, and is screwed into a screw portion at the top of the anchor bolt. It is common to hold between upper and lower nuts. This template is a temporary one in which foundation concrete is cast and becomes unnecessary after the concrete is hardened.

  The purpose of the present invention is to provide a steel column base that can secure a horizontal joint surface of a steel column to the top end of the foundation column while placing the foundation concrete, and that increases the degree of fixation.

  A lower nut serving as a reference for the height is provided in the threaded portion of a plurality of anchor bolts that are vertically erected and made of foundation concrete, anchor bolts, and a template, and further, the bolt holes provided in the template are inserted through the lower nuts. Adjusting the level with a nut, ensuring that the top surface of the template and the top edge of the foundation concrete are aligned at the same height, the concrete is cast and integrated, and the top surface of the embedded template is attached to the lower end of the square steel pipe. It is a basic pillar that is the joining surface of the base plate.

  The steel pillar is composed of a square steel pipe and a base plate having a bolt hole at the lower end thereof, and the square steel pipe is attached to the threaded portion of the anchor bolt protruding from the upper surface of the template. The base column was used by inserting the bolt hole of the base plate attached to the lower end of the base plate, uniting the upper surface of the template and the lower surface of the base plate with a bonding agent, and further tightening and adhering them with the upper nut. It is a steel column base characterized by

  In the central part of the template, there is a basic pillar provided with a confirmation hole that can surely know the concrete filling state.

  Adjust the horizontal plane with the lower nut screwed to the anchor bolt so that the upper surface of the template is the same height as the top end of the foundation column, and then place the concrete to the top end of the foundation column while placing the foundation concrete. And securing the joint surface of the base plate, and then inserting the bolt hole of the base plate attached to the lower end of the square steel pipe into the anchor bolt protruding from the upper surface of the template, combining the template and the base plate with a joint agent, The steel column base installation method is characterized in that the steel frame is erected directly on the upper surface of the template by a process of tightening them with an upper nut.

  As described above, the steel column base of the present invention can secure a horizontal joint surface of the steel column to the top end of the foundation column by embedding the template. In addition, the process of filling the non-shrink mortar can be omitted and the construction period can be shortened and the construction cost can be reduced. In addition, by joining rigid plates and introducing tension to the anchor bolt, the surfaces of the template and the base plate can be reliably brought into close contact with each other, and a large compressive force can be obtained between the members. . Then, the degree of fixation of the steel column base in the horizontal force can be increased within the range where this compressive force is obtained.

It is a block diagram of the steel column base of this invention. It is an assembly process figure of the steel column base of the present invention. (A) The process of placing foundation concrete (b) The process of constructing steel frame It is a block diagram of the conventional steel column base.

  The structure of the steel column base of the present invention is shown in FIG.

  The steel column base 1 of the present invention comprises a foundation column 2 and a steel column 3, and this foundation column 2 has a foundation concrete 21, anchor bolts 22 embedded therein, lower nuts 24a and 24b, and a thick plate-like template. The steel pillar 3 is composed of a square steel pipe 31, a thick plate-like base plate 32 attached to the lower end thereof, a washer 34, and upper nuts 33a and 33b. The template 23 and the base plate 32 are provided with bolt holes 231 and 321, respectively, and the template 23 is also provided with a confirmation hole 232. First, lower nuts 24a and 24b serving as reference heights are provided on threaded portions of a plurality of anchor bolts 22 that are vertically erected, and bolts provided on a template 23 having a thickness greater than that of a conventional thin plate template. The hole 231 is inserted, the horizontal adjustment is ensured by the lower nuts 24a and 24b, and is further clamped by the temporary upper nut 25, and the top surface of the template 23 and the top end of the foundation concrete 21 are aligned at the same height. To be integrated. Incidentally, a confirmation hole 232 is provided in the center of the template 23 so that the concrete filling state can be surely detected. Next, the temporary upper nut 25 is removed, and the bolt hole 321 of the base plate 32 attached to the lower end of the square steel pipe 31 is inserted into the threaded portion of the anchor bolt 22 protruding from the upper surface of the embedded template 23, and the template In this configuration, the upper surface of 23 and the lower surface of the base plate 32 are combined with the bonding agent 4, and further, these are fastened and brought into close contact with the upper nuts 33 a and 33 b.

  The anchor bolt 22 has a steel rod shape and is threaded at an appropriate length at the upper end, and has an adhesion function on the surface other than the lower threading. The lower nut 24a and the lower nut 24b are double-engaged with the threaded portion, and the height of the upper surface of the lower nut 24a is adjusted so that the thickness of the template 23 is lowered from the top end of the foundation concrete 21. To ensure levelness. Incidentally, the lower nuts 24a and 24b are double-threaded in order to prevent the nuts from loosening. However, it is not always necessary to double-screw if the level can be ensured. .

  The template 23 is a steel quadrilateral that is appropriately thicker than a conventional thin plate template, and is provided with a plurality of bolt holes 231 through which the anchor bolts 22 are inserted. A confirmation hole 232 having a size of about 10 mm is provided so that the concrete filling condition can be detected with certainty. When the paste-like paste of raw concrete is ejected from the confirmation hole 232, the completion of filling can be confirmed visually. Then, conventionally, in order to embed the anchor bolt in a predetermined position, a template is temporarily used to place foundation concrete. Moreover, after the foundation concrete was placed, it was necessary to adjust the height of the steel column. However, in the steel column base of the present invention, by changing the method of using the template and embedding it, while ensuring the accuracy of the position and height of the anchor bolt, which is the conventional purpose of use, on the other hand, A horizontal joint surface of the steel column can be secured to the top of the foundation column along with the placement.

  Further, the bolt hole 231 of the template 23 is inserted into the screw portion at the upper end of the anchor bolt 22, and the horizontal adjustment is ensured by the lower nuts 24a and 24b, and the top surface of the template 23 and the top end of the foundation concrete 21 are the same height. Then, after confirming again or adjusting, the temporary upper nut 25 is screwed together to prevent the lower nuts 24a and 24b from being loosened and pinched. Further, the level of the foundation concrete 21 is checked again before the foundation concrete 21 is placed, and the foundation concrete 21 is placed. Incidentally, the upper nut 25 is removed after the concrete is hardened.

  Then, an appropriate amount of metal adhesive serving as the bonding agent 4 is hung at the center of the template 23 and attached to the lower end of the square steel pipe 31 on the threaded portion of the upper end of the anchor bolt 22 protruding from the upper surface of the template 23. The bolt holes 321 of the base plate 32 are inserted and combined. Further, after injecting a metal adhesive into the gaps between the anchor bolt 22 and the bolt hole 231 and the bolt hole 321, a washer 34 is attached to this threaded portion, and the upper nut 33a and the upper nut 33b are double screwed together to loosen them. The steel column base 1 composed of the foundation column 2 and the steel column 3 can be integrated by stopping and tightening. In addition, by bringing them into close contact, a large compressive force is obtained between the members of the template 23 and the base plate 32, and no slip occurs between the members, resulting in an increase in frictional resistance. Improved earthquake resistance. Incidentally, the bolt hole 231 and the bolt hole 321 are of course on the same vertical.

  With regard to the template 23, the accuracy of the position and height of the anchor bolt 22 can be ensured as before, and on the other hand, it becomes the joint surface of the base plate 32 attached to the lower end of the square steel pipe 31, and these two things Any shape can be used as long as it can also be used. Further, it is only necessary to be integrated so that no slip occurs between the members of the template 23 and the base plate 32 with respect to the horizontal force. In this embodiment, the bonding agent 4 is a metal adhesive, In this case, any appropriate method such as welding or high-strength bolts may be used.

  The size and thickness of the template 23, the number of anchor bolts 22 and the like are proportional to the specification of the applicable column size. In this embodiment, the steel column 3 is the square steel pipe 31. However, any suitable shape such as an H-shaped steel may be used.

The assembly process of the steel column base fixing structure of the present invention is shown in FIG.
(A) Placing foundation concrete The bolt hole 231 of the template 23 is inserted into the threaded portion of the anchor bolt 22, and the anchor is placed so that the upper surface of the template 23 is at the same height as the top end of the foundation pillar 2. Adjust the horizontal plane with the lower nuts 24a and 24b screwed to the bolts 22 and clamp them with the upper nut 25. Next, secure the joint surface of the steel column 3 to the top end of the foundation column 2 while placing the foundation concrete 21. To do.
(B) Step of constructing steel frame Then, the upper nut 25 is removed, and the base plate attached to the lower end of the square steel pipe 31 on the threaded portion of the anchor bolt 22 projecting from the upper surface of the template 23 which is secured and leveled. 32, the upper surface of the template 23 and the lower surface of the base plate 32 are combined with the bonding agent 4, and further tightened with the upper nuts 33a and 33b to directly attach the steel frame to the upper surface of the template 23. Do.

DESCRIPTION OF SYMBOLS 1 Steel column base 2 Foundation column 21 Foundation concrete 22 Anchor bolt 23 Template 231 Bolt hole 232 Confirmation hole 24a Lower nut 24b Lower nut 25 Upper nut 3 Steel frame 31 Square steel pipe 32 Base plate 321 Bolt hole 33a Upper nut 33b Upper nut 34 Washer 4 Bonding agent 5 Conventional steel column base 51 Manju 52 Non-shrink mortar 53 Nut

Claims (4)

  Lower nuts 24 a and 24 b that serve as reference heights are provided on the threaded portions of the plurality of anchor bolts 22 that are composed of foundation concrete 21, anchor bolts 22, and templates 23, and are provided on the template 23. The bolt holes 231 are inserted, the horizontal adjustment is ensured by the lower nuts 24a and 24b, and the concrete is placed and integrated with the upper surface of the template 23 and the top edge of the foundation concrete 21 being at the same height. A foundation column, wherein the upper surface of the template 23 becomes a joint surface of a base plate 32 attached to the lower end of the square steel pipe 31.   The steel pillar 3 comprises a square steel pipe 31 and a base plate 32 having a bolt hole 321 at the lower end thereof. The anchor bolt 22 protrudes from the upper surface of the template 23. The bolt hole 321 of the base plate 32 attached to the lower end of the square steel pipe 31 is inserted into the threaded portion of the steel plate 31, the upper surface of the template 23 and the lower surface of the base plate 32 are combined with the bonding agent 4, and these are further connected with the upper nuts 33 a and 33 b. A steel column base comprising the foundation pillar according to claim 1, wherein the foundation pillar according to claim 1 is integrated by tightening and adhering.   The foundation pillar according to claim 1, wherein a confirmation hole 232 is provided at a central portion of the template 23 so that a concrete filling state can be surely detected. The horizontal plane is adjusted and secured by lower nuts 24 a and 24 b screwed to the anchor bolts 22 so that the upper surface of the template 23 is at the same height as the top end of the foundation pillar 2, and then the foundation concrete 21 is placed together with the foundation concrete 21. The step of securing the joint surface of the steel column 3 to the top end of the column 2, and then the bolt hole 321 of the base plate 32 attached to the lower end of the square steel pipe 31 is inserted into the anchor bolt 22 protruding from the upper surface of the template 23. Then, by installing the steel column base on the upper surface of the template 23 by combining the template 23 and the base plate 32 with the bonding agent 4 and further fastening them with the upper nuts 33a and 33b, Method.

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