A structure including column bases and steel columns to be installed on a ground improvement body, and a method for constructing the same.

Abstract

The present invention provides a structural system, including column bases and steel columns, to be installed on a ground improvement structure, which can reduce costs and shorten construction time. [Solution] Structure A includes a column base R1 and a steel column P installed in the upper excavation section 3 of the ground improvement body, which is formed by excavating the upper part of the ground improvement body 2 to create a substantially horizontal bottom surface 3A. Structure A has lean concrete 4 poured on the bottom surface 3A, a post-installed anchor 5 fixed to the lean concrete 4, a level adjustment device L provided on the lean concrete 4, a steel column P placed on the level adjustment device L with the insertion hole of the base plate 7 inserted through the post-installed anchor 5, a nut 8 screwed onto the threaded portion 5A of the post-installed anchor 5 protruding upward from the insertion hole, foundation reinforcement installed in the upper excavation section 3 of the ground improvement body, and foundation concrete 9 poured in the upper excavation section 3 of the ground improvement body.

Claims

1. A structure including column bases and steel columns to be installed in the excavated section at the top of a ground improvement body, where the top of the ground improvement body is excavated to form a bottom surface that is approximately horizontal, The lean concrete poured onto the aforementioned bottom surface, The post-installed anchor fixed to the aforementioned lean concrete, A leveling device installed on the aforementioned lean concrete, The steel column is placed on the leveling device, with the insertion hole of the base plate inserted through the aforementioned post-installed anchor, A nut is screwed onto the threaded portion of the post-installed anchor that protrudes upward from the aforementioned insertion hole, The foundation reinforcement installed in the excavated section above the ground improvement body, and the foundation concrete poured in the excavated section above the ground improvement body, It has, There are no connecting members around the portion of the steel column that is embedded in the foundation concrete to which the underground beam is connected. A structure including column bases and steel columns installed on a ground improvement structure.

2. A axial member that protrudes horizontally is provided around the portion of the steel column that is embedded in the foundation concrete. A structure including a column base and a steel column to be installed on a ground improvement body as described in claim 1.

3. The steel column consists of the base plate and partway up the first-floor column, and has a column joint at the tip of the partway up the first-floor column. A structure including a column base and a steel column to be installed on a ground improvement body according to claim 1 or 2.

4. The steel column consists of at least the base plate to the first-floor column, and has a beam joint at at least the upper end of the first-floor column. A structure including a column base and a steel column to be installed on a ground improvement body according to claim 1 or 2.

5. The steel column comprises at least the base plate to the first-floor column, and at least the upper end of the first-floor column to the middle of the second-floor beam extending horizontally is integrated with the first-floor column, and at least the tip of the middle of the second-floor beam has a beam joint. A structure including a column base and a steel column to be installed on a ground improvement body according to claim 1 or 2.

6. A method for constructing a structure including a column base and a steel column to be installed in the excavated portion of the upper part of a ground improvement body, which is formed by excavating the upper part of the ground improvement body to create a substantially horizontal bottom surface, There are no connecting members around the portion of the steel column that is embedded in the foundation concrete to which the underground beam is connected. A step of improving the surface ground to the required shape to form the improved ground body, The process involves excavating the upper part of the ground improvement body, which is the location where the steel columns will be installed, to the required shape of the excavated section at the top of the ground improvement body, The process of pouring lean concrete onto at least the bottom surface of the excavated section above the ground improvement body, The process involves fixing post-installed anchors to the lean concrete on the upper part of the bottom surface, The steps include: installing a leveling device on the lean concrete above the bottom surface, The process of inserting the post-installed anchor through the insertion hole in the base plate at the lower end of the steel column, placing the base plate on the leveling device, screwing a nut onto the threaded portion of the post-installed anchor protruding upward from the insertion hole, and installing the steel column, The process of placing foundation reinforcement in the space where the foundation concrete is to be poured in the excavated section above the ground improvement body, The process of pouring the foundation concrete into the space in which the foundation concrete is to be poured, Having, A construction method for a structure including column bases and steel columns installed on a ground improvement body.

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