JP-2026075791-A - Anchor jig and column installation method

Abstract

[Problem] The problem addressed by the present invention is to solve the problems of the prior art, namely, to provide an anchoring jig that can be detachably attached to a bolt holding material that determines the position of a column bolt, and a method for installing a column using the same. [Solution] The anchoring jig of the present invention is a jig for supporting a cable that pulls the upper part of a column when installing a column on a structural concrete using a column bolt positioned by a bolt holding member, and comprises a connecting member, a reinforcing bar for anchoring, and a locking member. The connecting member is fixed to the bolt holding member, the reinforcing bar for anchoring is positioned to protrude from the structural concrete, and the locking member is attached to the reinforcing bar for anchoring. However, the connecting member is detachably joined to the locking member. One end of the cable is then locked to the locking member. [Selection Diagram] Figure 4

Inventors

• 國分 直輝
• 横井 勝己

Assignees

• 株式会社安藤・間

Dates

Publication Date

20260511

Application Date

20241023

Claims (6)

1. A jig for supporting a cable that pulls the upper part of a column when installing a column on a concrete structure using a column bolt positioned by a bolt holder, A connecting member fixed to the bolt retaining member, Reinforcing bars for anchoring are arranged to protrude from the aforementioned concrete structure, The system comprises a locking member that is attached to the aforementioned anchoring reinforcing bar, The connecting member is detachably joined to the locking member, One end of the cable is locked to the locking member. An anchoring jig characterized by the following features.
2. The connecting member has bolt holes for locking members formed therein. A locking bolt is fixed to the aforementioned locking member. The connecting member is joined to the locking member by tightening the locking member bolt, which is inserted through the bolt hole for the locking member, with a nut. The anchoring jig according to claim 1.
3. The connecting member has bolt holes for locking members formed therein. The locking member is a U-shaped rod with a screw formed at its tip. The connecting member is joined to the locking member by inserting the locking member, which is secured to the anchoring reinforcing bar, through the bolt hole for the locking member and then tightening the tip of the locking member with a nut. The anchoring jig according to claim 1.
4. The connecting member has bolt holes for retaining members formed therein. The connecting member is fixed to the bolt retaining member by tightening the retaining member bolts, which are inserted through the bolt holes formed in the bolt retaining member and the bolt holes for the retaining member, with nuts. The anchoring jig according to claim 1.
5. A method of installing column members on the structural concrete using an anchoring jig, The anchoring jig comprises a connecting member, a reinforcing bar for anchoring, and a locking member. A locking member installation step involves positioning the anchoring reinforcing bar, to which the locking member is attached, so that it protrudes from the structural concrete, The column bolt installation process involves inserting the column bolt through the bolt holding member to which the connecting member is fixed, and installing the column bolt while positioning it. A connecting member joining step in which the connecting member is detachably joined to the locking member, The concrete pouring process involves pouring concrete into the assembled structural formwork, The process includes erecting the column using the column bolts, attaching one end of the cable to the top of the column, and securing the other end of the cable to the locking member, By pulling the aforementioned cable, the vertical position of the column can be adjusted. A method for installing column members characterized by the following features.
6. The process further includes a bolt retainer removal step, in which the bolt retainer is removed from the column bolt after the concrete pouring step, In the bolt retaining member removal process, the connecting member is also removed along with the removal of the bolt retaining member. The column installation method according to claim 5, characterized by its features.

Description

This invention relates to a technology for erecting columns in steel-framed buildings, and more specifically, to an anchoring jig for adjusting column members and a method for installing column members using this jig. In the first stage of steel-frame construction, during column erection, as shown in Figure 13(a), column members SC, such as steel columns, are fixed using column bolts CB. Specifically, the column bolts CB, embedded in the concrete structure SL (columns, beams, slabs, etc.), are inserted through bolt holes in the base plate PL (base plate) of the column member SC. The nuts NT are then tightened, essentially "sewing" the base plate PL to the concrete structure SL with the column bolts CB, thereby fixing the column member SC. To embed the column bolts CB in the concrete structure SL, the column bolts CB must be positioned so that a portion of them protrudes upward before the concrete is poured. Naturally, the column bolts CB are positioned so that their planar position aligns with the bolt holes provided in the base plate PL. However, during concrete pouring, the fresh concrete poured into the formwork comes into contact with the column bolts CB, they are vibrated by high-frequency vibrators, and workers come into contact with them, resulting in the column bolts CB being subjected to extremely fluctuating positions. Consequently, if the column bolts CB tilt or shift position, they cannot be properly inserted into the base plate PL, requiring extra work such as adjusting the column bolts CB. Therefore, a bolt retainer HP, as shown in Figure 13(b), is typically used. This bolt retainer HP is often a ring-shaped plate with bolt holes formed at positions corresponding to the bolt holes in the base plate PL. The column bolts CB are then inserted through the bolt holes in the bolt retainer HP, and concrete is poured with the bolt retainer HP and column bolts CB fixed in place. This ensures that even when vibrations from a high-frequency vibrator are applied, the column bolts CB maintain their position through the bolt retainer HP, allowing for smooth insertion into the bolt holes of the base plate PL. Furthermore, in the first stage of column erection in steel-frame construction, wire ropes or other cable materials are used to prevent the column members SC from toppling and to adjust their vertical alignment (adjust the angle of the column members). Figure 14 is a schematic side view (however, the concrete structure SL is shown as a cross-section) illustrating an example of preventing the column members SC from toppling using cable materials WR. As shown in this figure, multiple cable materials WR are attached to the top of the column member SC, and by pulling these cable materials WR from different directions (for example, from all four sides) using a chain block BL or similar device, the column member SC is prevented from toppling and its vertical alignment is adjusted. Normally, the lower end of the cable material WR is connected to an anchor AC to obtain a reaction force. This anchor AC is, for example, a U-shaped jig made of reinforcing steel. As shown in Figure 14, its lower part is embedded in the concrete structure SL, and its upper part is installed so as to protrude from the concrete structure SL. The lower end of the cable WR is connected to the U-shaped protruding portion of the anchor AC via a shackle or the like; in other words, the cable WR receives a reaction force from the anchor AC. Furthermore, installing anchor ACs requires surveying to determine the correct position and height, which is time-consuming and labor-intensive, posing a problem for construction efficiency. In large facilities (such as logistics warehouses), numerous column members SCs are installed, increasing the number of anchor ACs required. However, due to the sheer number, cases of forgetting to install anchor ACs are frequently observed, impacting construction quality. Additionally, because anchor ACs protrude from the concrete structure SL, workers risk tripping over them, reducing safety. Moreover, if the floor (concrete structure SL) is directly finished, removing the anchor ACs or repairing the floor is necessary to avoid compromising aesthetics. Therefore, various technologies for installing anchor ACs have been proposed to date. For example, Patent Document 1 proposes a technology that uses a fixed steel plate and beam main reinforcement support hardware positioned to sandwich the main reinforcement of a concrete structure from above and below, allowing a wire rope to be attached to an anchor hook for steel column erection fixed to the fixed steel plate. Japanese Patent Publication No. 2007-009411 A schematic side view showing the situation where a column is being pulled by a cable.(a) is a schematic side view showing the connecting member constituting the anchor jig of the present invention, and (b) is a schematic side view showing the locking member and anchoring reinforcing bar constituting the anchor ji