JP2023148878A - Construction method of column joint part - Google Patents

Abstract

To provide a construction method of a column joint part capable of easily performing construction when joining a lower first column and an upper second column.SOLUTION: A construction method of a column joint part 1 comprises the steps of: preparing a plurality of temporary bolts 30, 40; installing the plurality of temporary bolts in a plurality of screw holes 12 formed in a first end plate 11 at an upper end of a first steel frame column 10; inserting the plurality of temporary bolts into a plurality of through-holes 22 formed in a second end plate 21 of a second steel frame column 20; bringing the second end plate into contact with the first end plate; temporarily fixing the second steel column by screwing nuts 50 to the plurality of temporary bolts by using the fastening tool; rebuilding; replacing the temporary bolts with the main bolts; and permanently fastening the main bolts.SELECTED DRAWING: Figure 9

Description

The present invention relates to a method of constructing a column joint, and particularly to a method of constructing a column joint that interconnects a lower column and an upper column with high precision.

BACKGROUND ART When constructing a steel column by joining a plurality of square steel pipes, circular steel pipes, etc. of a predetermined length on-site, a joining method in which the steel pipes are joined together by welding is generally used. However, joining by welding is time-consuming, the success of the work depends on the weather, and the accuracy of welding depends on the level of skill. Therefore, these problems can be solved by bolting the steel pipes together.

When joining steel pipes with bolts, for example, as described in Patent Document 1, the construction of a column joint that connects a lower steel column and an upper steel column with each other requires that the upper steel column be The upper and lower steel columns are suspended above the lower steel column, and the upper and lower steel columns are connected with bolts and It is common to connect them with nuts.

Furthermore, in Patent Document 2, an intermediate steel column is arranged between the lower end surface of an upper steel column and the upper end surface of a lower steel column, and a verticality adjustment mechanism is provided at the center of the middle bottom of the intermediate steel column. A technique has been disclosed that determines and determines the vertical accuracy of the upper steel frame column by screwing the erection bolt downward and tilting it using the erection bolt as a fulcrum.

Japanese Patent Application Publication No. 2016-191257 JP2007-285028A

When constructing the column joint, the upper steel column (column at the second joint) is lifted above the lower steel column (column at the first joint) using a crane, and the end plates are brought into contact with each other. It is difficult to connect the end plates of columns with bolts and nuts.

Specifically, the through-hole formed in the end plate of the steel column (column at the second joint) has the same size (hole diameter) as the diameter of the bolt to be inserted, and the gap between the bolt and the through-hole ( Since there is almost no clearance (clearance of only a few mm), the bottom surface of the end plate of the upper steel column must be accurately aligned with the top surface of the end plate of the lower steel column. The through holes must be aligned.

However, the upper steel column (column at the second joint) that is being lifted by a crane or the like is shaking, and it is extremely difficult to precisely align the positions of the through holes in the end plates to within a few millimeters. It is also difficult to secure the end plates to each other with temporary bolts while maintaining precise alignment.

The present invention has been made in view of the above-mentioned problems, and its purpose is to control the position of the second pillar relative to the first pillar when joining the lower first pillar and the upper second pillar. It is an object of the present invention to provide a method of constructing a column joint part, which makes it possible to easily perform the work of properly arranging a column joint part.

The above problem is solved according to the method for constructing a column joint of the present invention, which is a method for constructing a column joint that connects a first column on the lower side and a second column on the upper side, which includes a step of preparing a plurality of temporary bolts. , installing a plurality of temporary bolts into a plurality of screw holes formed in a first end plate provided at the upper end of the first column; and a second end provided at the lower end of the second column. A step of inserting a plurality of temporary bolts into a plurality of through holes formed in a plate, a step of bringing the second end plate into contact with the first end plate, and a step of screwing nuts into the plurality of temporary bolts. a step of temporarily fixing the second pillar to the first pillar by using a screw, a step of rebuilding the building, a step of replacing the plurality of temporary bolts with a plurality of permanent bolts, and a step of permanently tightening the plurality of main bolts. The problem is solved by performing the steps of:

In the construction method of the column joint part of the present invention configured as described above, a temporary bolt is installed in advance on the first column, and a temporary bolt is installed in the through hole of the second end plate at the lower end of the second column. Since the second column can be guided by inserting the bolt, it is possible to easily position the second column appropriately with respect to the first column.

At this time, the nuts engage, in order from the upper end of the plurality of temporary bolts, an engaging portion that engages with a tightening tool, and a fixed side screw portion that screws into the screw hole of the first end plate. A tightening side threaded portion, and the engaging portion preferably has a smaller diameter than the tightening side threaded portion.
With the above configuration, the tightening tool can appropriately grasp the engaging portion provided at the upper end of the temporary bolt, so that the work of tightening the temporary bolt becomes easy.

At this time, the tightening tool includes a socket that engages with the engaging portion of the temporary bolt, and in the step of installing the temporary bolt, the tightening tool engages the socket with the engaging portion and tightens the temporary bolt. The temporary bolt may be installed in the screw hole using a tool.
With the above configuration, it is possible to easily screw the temporary bolt into the screw hole of the first end plate using a tightening tool equipped with a socket.

At this time, it is preferable that the engaging portion of the temporary bolt has a hexagonal shape.
With the above configuration, a series of operations can be easily and quickly performed from above using a tightening tool equipped with a general-purpose hexagonal socket.

According to the method for constructing a column joint according to the present invention, when joining the lower first column and the upper second column, it is easy to appropriately position the second column with respect to the first column. becomes possible.

It is a perspective view showing a column joint part concerning this embodiment. It is an explanatory view showing the structure of a first steel column on the lower side and a second steel column on the upper side. It is a front view of the 1st temporary bolt used in the construction method of the column joint part concerning this embodiment. It is a front view of the 2nd temporary bolt used in the construction method of the column joint part concerning this embodiment. It is a flowchart of the construction method of the column joint part based on this embodiment. It is a figure showing the state where the 1st temporary bolt and the 2nd temporary bolt were installed in the 1st end plate of the 1st steel column. It is a figure showing the state where the 1st end plate and the 2nd end plate contacted. It is a figure explaining the procedure at the time of moving a 2nd steel frame column below and joining with a 1st steel frame column. It is a figure explaining the procedure of inserting the 1st temporary bolt and the 2nd temporary bolt installed in the 1st end plate into the through-hole of the 2nd end plate. It is a figure which shows the state at the time of inserting the front-end|tip part of a 1st temporary bolt into the through-hole of a 2nd end plate. It is a figure which shows the state which attached the nut to the 1st temporary bolt and the 2nd temporary bolt.

Hereinafter, a method for constructing a column joint portion according to an embodiment of the present invention (hereinafter referred to as the present embodiment) will be described using FIGS. 1 to 11. In the following embodiments, the same or similar components are shown with common reference numerals, and the scale of these drawings is changed as appropriate to facilitate understanding.

In addition, in the following description, as shown by the arrows in FIG. 1, the vertical direction means the vertical direction of the first steel column 10 and the second steel column 20 in an upright state. Moreover, the outside and the inside are determined based on the first steel column 10 and the second steel column 20. That is, the direction approaching the center of the steel columns 10, 20 is defined as the inward direction, and the direction moving away from the center is defined as the outward direction.

[1. Regarding the first steel column 10 and second steel column 20 that constitute the column joint part 1]
First, the first steel column 10 and the second steel column 20 that constitute the column joint part 1 will be explained with reference to FIGS. 1 and 2. FIG. 1 is a perspective view showing a column joint part 1 according to the present embodiment, which is composed of a first steel column 10 and a second steel column 20, and FIG. 2 is a perspective view of the upper end of the first steel column 10 on the lower side. FIG. 3 is an explanatory diagram showing the structure of the lower end portion of the upper second steel column 20. FIG.

As shown in FIG. 1, the column joint part 1 (column joint structure) to be constructed according to the present embodiment has a first steel column 10 (first column, first joint column) on the lower side, and a column on the upper side. It is formed by mutually joining the second steel column 20 (second column, second joint column). Note that, in FIG. 1, illustrations of bolts and nuts for fixing the first steel column 10 and the second steel column 20 to each other are omitted.

As shown in FIG. 2, a square-shaped first end plate 11 is provided at the upper end of the first steel column 10. As shown in FIG. Furthermore, a square-shaped second end plate 21 similar to the first end plate 11 is provided at the lower end of the second steel column 20 . The vertical thickness of the first end plate 11 is thicker than the vertical thickness of the second end plate 21.

As shown in FIG. 2, four screw holes 12 that open upward are formed at the four corners of the first end plate 11, respectively. The threaded holes 12 have left-handed threads (reverse threads) in the threaded parts (first fixed-side threaded part 31 and second fixed-side threaded part 41) of temporary bolts (first temporary bolt 30 and second temporary bolt 40), which will be described later. This is a screw hole for a left-handed screw (reverse screw) that corresponds to a certain thing.

Furthermore, four through holes 22 are formed at the four corners of the second end plate 21, respectively. Each through hole 22 is formed at a position corresponding to each screw hole formed in the first end plate 11. Specifically, when the first end plate 11 and the second end plate 21 come into contact with each other with their outer circumferences substantially matching (when they come into contact with each other), each screw hole 12 is inserted into the second end. They coincide with the through holes 22 formed in correspondence with the plates 21 so as to be continuous with each other (FIGS. 8 and 9, which will be described later).

When constructing the column joint part 1, first, the lower end of the first steel column 10 is fixed to a foundation (not shown) with an anchor bolt, and the upper end of the first steel column 10 is lifted using a lifting device such as a crane (not shown). The second steel column 20 is lifted from the Then, the second end plate 21 is accurately positioned with respect to the first end plate 11 and arranged so that the through hole 22 of the second end plate 21 matches the corresponding screw hole 12 of the first end plate 11. Then, it is necessary to insert a temporary bolt into the through hole 22 and screw hole 12 and temporarily fix it.

However, the upper second steel column 20 being lifted by the lifting device is swaying in the outward and outward directions, and it is very difficult to precisely align the through hole 22 with the screw hole 12 of the first end plate 11. Therefore, in the construction method of the column joint part 1 according to the present embodiment, a combination of two types of temporary bolts having different lengths described below, specifically, the first temporary bolt 30 and the second temporary bolt 40 are used. This is a characteristic.

[2. Regarding the composition of temporary bolts]
The first temporary bolt 30 (FIG. 3) and the second temporary bolt 40 (FIG. 4), which are temporary bolts used in the construction method of a column joint according to the present embodiment, will be explained below with reference to FIGS. 3 and 4. do. Note that the first temporary bolt 30 and the second temporary bolt 40 are the same except that the lengths of the respective tightening side threaded portions (the first tightening side threaded portion 33 and the second tightening side threaded portion 43) are different. Since the structure is as follows, first the first temporary bolt 30 will be explained, and then the second temporary bolt 40 will be explained about the differences from the first temporary bolt 30.

A "temporary bolt" is a bolt used for temporary fixing before tightening the main bolt (high-strength bolt, high-tension bolt). When constructing a steel structure, members are fixed after ensuring a certain level of accuracy, and temporary bolts are necessary for fixing the members. It is difficult to join joints and joints at the same time with main bolts, and when tightening a certain part with main bolts, it is necessary to fix other joints so that they do not move. Temporary bolts are used to fix the members at this time.

(First temporary bolt 30)
As shown in FIG. 3, the first temporary bolt 30 has, from the bottom, a first fixed side threaded part 31, a first cylindrical part 32, a first tightening side threaded part 33, and a first upper end part 34. There is. The first fixed screw portion 31 is a portion that is screwed into the screw hole 12 of the first end plate 11 , and its height (length in the vertical direction) corresponds to the depth of the screw hole 12 . Moreover, the second steel column 20 is temporarily fixed to the first steel column 10 by threading a nut 50, which will be described later, into the first tightening side threaded portion 33.

The first upper end portion 34 has a tapered shape by chamfering its tip to form a first tapered portion 34a, and becomes thinner toward the tip. The first upper end portion 34 is formed with a first engaging portion 34b having a hexagonal outer shape. A socket of a tightening tool (not shown) having a hexagonal socket engages with the first engaging portion 34b.

The first temporary bolt 30 also includes a first fixed side threaded portion 31 that is screwed into the screw hole 12 of the first end plate 11, and a first tightening side threaded portion 33 that is screwed into the temporary fixing nut 50. However, the first fixing side threaded part 31 and the first tightening side threaded part 33 are threaded parts in opposite directions.

Specifically, the first fixed side threaded portion 31 is a left-handed thread (reverse thread), and is formed such that the thread groove is directed downward when it is rotated to the left (rotated counterclockwise) when viewed from above. . On the other hand, the first tightening side threaded portion 33 is a right-handed thread (normal thread), and is formed so that the thread groove is directed downward when rotated to the right (clockwise) when viewed from above. .

The entire length of the first temporary bolt 30 from the lower end to the upper end is the first length L1. Also, when the first fixed side screw portion 31 of the first temporary bolt 30 is completely screwed into the screw hole 12 of the first end plate 11, the first protrusion length ( In other words, the total length of the first cylindrical portion 32, the first tightening side threaded portion 33, and the first upper end portion 34 is L1a.

(Second temporary bolt 40)
The basic aspect of the second temporary bolt 40 is the same as that of the first temporary bolt 30, and as shown in FIG. It has a threaded portion 43 and a second upper end portion 44 .

The second temporary bolt 40 has a shorter length (full length) than the first temporary bolt 30 because the length of the second tightening side threaded portion 43 is shorter than that of the first tightening side threaded portion 33. It's different. Specifically, the entire length of the second temporary bolt 40 from the lower end to the upper end is the second length L2. Further, when the second fixed side screw portion 41 of the second temporary bolt 40 is completely screwed into the screw hole 12 of the first end plate 11, the second protrusion length ( In other words, the total length of the second cylindrical portion 42, the second tightening side threaded portion 43, and the second upper end portion 44 is L2a.

The second length L2 of the second temporary bolt 40 is shorter than the first length L1 of the first temporary bolt 30. In other words, the first length L1 of the first temporary bolt 30 is longer than the second length L2 of the second temporary bolt 40 (L1>L2). More specifically, regarding the protrusion length that protrudes from the upper surface of the first end plate 11 when the first temporary bolt 30 and the second temporary bolt 40 are completely screwed into the screw hole 12 of the first end plate 11, The second protrusion length L1a is longer than the second protrusion length L2a (L1a>L2a).

In this way, the lengths of the first temporary bolts 30 and the second temporary bolts 40 are different, so that the length of the second end plate 21 is different, as will be described in detail in the construction method of the column joint part of this embodiment below. Since the second temporary bolt 40 can be inserted after the longer first temporary bolt 30 is inserted into the through hole 22, when two temporary bolts of the same length are inserted at the same time. The work becomes easier compared to

[3. About the construction method of column joints]
Hereinafter, with reference to FIGS. 5 to 11, the construction method of the column joint portion of this embodiment will be described in detail. The method for constructing a column joint according to this embodiment is characterized by using the first temporary bolt 30 and the second temporary bolt 40 described above.

Specifically, the method for constructing a column joint according to the present embodiment is to construct a column joint that connects a lower first steel column 10 (first column) and an upper second steel column 20 (second column). The construction method includes a temporary bolt preparation step (step S1) of preparing a plurality of temporary bolts 30, 40, and a plurality of screws formed on the first end plate 11 provided at the upper end of the first steel column 10. A temporary bolt installation step (step S2) in which a plurality of temporary bolts 30 and 40 are installed in the holes 12, and a plurality of through holes 22 formed in the second end plate 21 provided at the lower end of the second steel column 20. A temporary bolt insertion process (step S3) of inserting a plurality of temporary bolts 30, 40, an end plate contact process (step S4) of abutting the second end plate 21 on the first end plate 11, and a temporary bolt insertion process (step S4) of inserting a plurality of temporary bolts 30, 40. 30, 40 with nuts 50 to temporarily fix the second steel column 20 to the first steel column 10 (step S5), and a rebuilding step (step S6) of rebuilding. It is characterized by performing a main bolt replacement step (step S7) in which the plurality of temporary bolts 30, 40 are replaced with a plurality of main bolts, and a final tightening step (step S8) in which the plurality of main bolts are finally tightened (step S8). Figure 5).

Each step will be described in detail below with reference to FIGS. 6 to 10. FIG. 6 is a diagram showing a state in which the first temporary bolt 30 and the second temporary bolt 40 are installed on the first end plate 11 of the first steel column 10. FIG. 7 is a diagram showing a state in which the first end plate 11 and the second end plate 21 are in contact with each other. FIG. 8 is a diagram illustrating a procedure for moving the second steel column 20 downward and joining it to the first steel column 10. FIG. 9 is a diagram illustrating a procedure for inserting the first temporary bolt 30 and the second temporary bolt 40 installed in the first end plate 11 into the through hole 22 of the second end plate 21. FIG. 10 is a diagram showing a state in which the tip end of the first temporary bolt 30 is inserted into the through hole 22 of the second end plate 21. FIG. 11 is a diagram showing a state in which nuts 50 are attached to the first temporary bolt 30 and the second temporary bolt 40.

(Temporary bolt preparation process)
In the temporary bolt preparation step (step S1), a plurality of temporary bolts 30, 40 are prepared. Specifically, a plurality of bolts including a first temporary bolt 30 (FIG. 3) having a first length L1 and a second temporary bolt 40 (FIG. 4) having a second length L2 shorter than the first length L1. Prepare temporary bolts 30 and 40.

(Temporary bolt installation process)
In the temporary bolt installation process (step S2), a plurality of temporary bolts 30 and 40 are installed in a plurality of screw holes 12 formed in the first end plate 11 provided at the upper end of the first steel column 10. Specifically, as shown in FIG. 6, of the four screw holes 12 formed in the first end plate 11, the first temporary bolt 30 is inserted into two diagonal screw holes 12, respectively. The first fixed side threaded portion 31 and the second fixed side threaded portion 41 of the second temporary bolt 40 are screwed together. This operation involves inserting a hexagonal socket (a socket having a hexagonal hollow section inside) of a socket-type tightening tool (a power tool such as an impact driver equipped with a hexagonal socket) into a hexagonal socket provided with the first temporary bolt 30. It is preferable to engage with the first engaging portion 34b or the hexagonal second engaging portion 44b of the second temporary bolt 40.

(Temporary bolt insertion process)
In the temporary bolt insertion process (step S3), the second steel column 20 is lifted and moved above the first steel column 10 using a lifting device such as a crane, and the lower end of the second steel column 20 is A plurality of temporary bolts 30 and 40 are inserted into a plurality of through holes 22 formed in a second end plate 21 provided. Specifically, the second steel column 20 is moved downward from the state shown in FIG. 6, and a plurality of temporary bolts are inserted into a plurality of through holes 22 formed in the second end plate 21 as shown in FIG. 30 and 40 are inserted.

(End plate contact process)
In the end plate contact step (step S4), the second end plate 21 is brought into contact with the first end plate 11. Specifically, as shown in FIG. 8, the second steel column 20 is moved downward to bring the second end plate 21 into contact with the first end plate 11.

In the temporary bolt insertion process (step S3) and the end plate contact process (step S4), as shown in FIG. A first temporary bolt 30 and a second temporary bolt 40 are installed in the hole 12, and the first temporary bolt 30 protrudes upward in a longer length than the second temporary bolt 40. Therefore, it becomes easy to insert the temporary bolt into the through hole 22 of the second end plate 21 provided at the lower end of the second steel column 20. More specifically, after first inserting the longer first temporary bolt 30 into the through hole 22 of the second end plate 21 (middle diagram in FIG. 9), the second temporary bolt 40 is inserted. This makes the work easier than inserting two temporary bolts of the same length at the same time.

Further, the first upper end portion 34 of the first temporary bolt 30 and the second upper end portion 44 of the second temporary bolt 40 are formed with a first tapered portion 34a and a second tapered portion 44a, and have a tapered shape. It becomes thinner towards the tip (Figures 3 and 4). According to such a configuration, since the upper end portions of each of the first temporary bolt 30 and the second temporary bolt 40 have a tapered shape, the first temporary bolt 30 is connected to the through hole 22 of the second end plate 21. And the second temporary bolt 40 can be inserted more easily (FIG. 10).

Moreover, since the first temporary bolt 30 is longer than the second temporary bolt 40, after the first temporary bolt 30 is inserted into the through hole 22 of the second end plate 21, the taper of the first temporary bolt 30 is The second temporary bolt 40 can be inserted through the thick part, which is not a partial part, as a guide part. That is, the second temporary bolt 40 is inserted into another through hole 22 in a stable state by bringing the thick portion of the first temporary bolt 30 into contact with the edge portion of the through hole 22 formed in the second end plate 21. be able to.

(Temporary fixing process)
In the temporary fixing step (step S5), the second steel column 20 is temporarily fixed to the first steel column 10 by threading nuts 50 onto the plurality of temporary bolts 30 and 40. Specifically, in the state shown in the right figure of FIG. The nut 50 is screwed together using a screwdriver, and the nut 50 is tightened until the upper surface of the second end plate 21 and the lower surface of the nut 50 come into contact (FIG. 11).

(Reconstruction process)
In the rebuilding process (step S6), rebuilding is performed. Specifically, the building will be rebuilt after the girders on the upper floor have been installed. When constructing a steel frame or steel-framed reinforced concrete building, in order to ensure the accuracy of the verticality of the steel columns, the beams and columns are corrected for collapse, levelness, bending, etc. after construction, and are rebuilt. There are no particular restrictions on the rebuilding method, and any method may be used, such as wrapping a wire rope around the pillars or beams and tensioning the wire rope with a lever hoist, etc. to keep the vertical accuracy of the steel column within a specified level. You can do it in this way.

(Main bolt replacement process)
In the main bolt replacement step (step S7), the plurality of temporary bolts 30, 40 are replaced with a plurality of real bolts. Specifically, the nut 50 and temporary bolts 30, 40 are loosened and pulled upward using a tool. Then, replace it with a main bolt (not shown). The main bolt is not particularly limited, but it is possible to use a high-strength bolt such as a Torsia-type high-strength bolt, or a main bolt having the same shape as the first temporary bolt 30 and the second temporary bolt 40. It is. Specifically, predetermined regular bolts are installed in the four screw holes 12 formed in the first end plate 11, respectively, in the same manner as the temporary bolts 30 and 40 were installed.

(Final tightening process)
In the final tightening step (step S8), a plurality of final bolts are fully tightened. Specifically, the bolts are firmly fixed to the four screw holes 12 formed in the first end plate 11 using a tightening tool, and then fixed using nuts.

As described above, the method for constructing the column joint portion of this embodiment is completed. Connecting the end plates with bolts and nuts while lifting the upper second steel column 20 (second joint column) above the lower first steel column 10 (first joint column) with a crane or the like. Although it is difficult to do so, in the method for constructing a column joint portion of this embodiment, temporary bolts 30 and 40 are installed on the first end plate 11 of the first steel column 10 to serve as guides for pulling in. In this way, the temporary bolts 30 and 40 are installed in advance on the first steel column 10, and the temporary bolts 30 and 40 are inserted into the through hole 22 of the second end plate 21 at the lower end of the second steel column 20. By inserting the second steel column 20, the second steel column 20 can be guided, so that it is possible to easily position the second steel column 20 appropriately with respect to the first steel column 10.

At this time, the upper end portions 34, 44 of the temporary bolts 30, 40 are provided with engaging portions 34b, 44b that engage with the hexagon socket of the tightening tool, and the engaging portions 34b, 44b are connected to the tightening side screw portion. It has a smaller diameter than 33 and 43. According to such a configuration, the hexagonal socket of the tightening tool can appropriately grip the engaging portions 34b, 44b provided at the upper ends 34, 44 of the temporary bolts 30, 40. This makes the tightening work easier.

Further, when a plurality of temporary bolts having the same length are used, it is difficult to insert two temporary bolts into the through holes 22 of the second end plate 21 at the same time. Therefore, by preparing two temporary bolts 30 and 40 with different lengths, the first temporary bolt 30, which has a longer length, can be drawn into the through hole 22 of the second end plate 21 and inserted. (middle diagram in FIG. 9), since the second steel column 20 is stabilized, it becomes easy to insert the second temporary bolt 40 into the through hole 22 of the second end plate 21.

Furthermore, by making the tips of the first temporary bolt 30 and the second temporary bolt 40 tapered, the gap (clearance) between the temporary bolts 30, 40 and the through hole 22 of the second end plate 21 is only a few mm. Even if there is no bolt, the clearance between the temporary bolts 30, 40 and the through hole 22 is increased, making it easier to draw in the second steel column 20 (FIG. 10).

Further, the temporary bolts 30 and 40 have fixed side threaded parts 31 and 41 that are screwed into the threaded holes 12 of the first end plate 11, and tightening side threaded parts 33 and 43 that are engaged with the nuts 50. , the fixed side threaded portions 31, 41 and the tightening side threaded portions 33, 43 are threaded portions with opposite directions. According to such a configuration, the fixed side threaded parts 31, 41 of the temporary bolts 30, 40 are screwed into the threaded holes 12 of the first end plate 11 provided at the upper end of the first steel column 10 on the lower side. Both the work (temporary bolt installation process) and the work of engaging the nut 50 with the tightening side screw parts 33, 43 of the temporary bolts 30, 40 (temporary fixing process) are performed from one side (that is, the upper side). This makes it easier to work at heights.

Furthermore, the engaging portions 34b, 44b of the temporary bolts 30, 40 have a hexagonal shape. According to such a configuration, tightening can be easily and quickly performed from above using a tightening tool equipped with a general-purpose hexagonal socket.

[4. Modified example]
Up to this point, the construction method of the column joint part of the present invention has been explained by taking one embodiment of its configuration and usage method as an example. However, the above-mentioned embodiment is just one example, and other examples are also possible. Conceivable.

In the above embodiment, the first engaging part 34b of the first temporary bolt 30 and the second engaging part 44b of the second temporary bolt 40 had a hexagonal outer shape, but the first engaging part 34b and the second The external shape of the engaging portion 44b is not limited to a hexagonal shape, but may be any external shape that corresponds to the tightening tool (more specifically, the shape of a socket), and may be square, pentagonal, or heptagonal. , a polygonal shape such as an octagonal shape.

In the above embodiment, the explanation was given by exemplifying the case where the lengths of the first temporary bolt 30 and the second temporary bolt 40 are different, but temporary bolts of the same shape are prepared and the attachment is used to tighten the temporary bolts. It is also possible to vary the total length of the.

In the above embodiment, the length of the first temporary bolt 30 and the second temporary bolt 40 is such that the length of the second tightening side threaded portion 43 is shorter than that of the first tightening side threaded portion 33. Although the lengths (total lengths) were different, it is also possible to make other parts, for example, the first cylindrical part 32 longer than the second cylindrical part 42.

In the above embodiment, the first fixed side threaded portion 31 of the first temporary bolt 30 is attached to each of the two diagonal threaded holes 12 among the four threaded holes 12 formed in the first end plate 11. and the second fixing side screw part 41 of the second temporary bolt 40 are screwed together, but if one first temporary bolt 30 and at least one second temporary bolt 40 are used, the temporary bolt 30 , 40 are installed in the screw holes 12 are not particularly limited.

Moreover, the above-mentioned form is only an example for easily understanding the present invention, and does not limit the present invention. The present invention may be modified and improved without departing from its spirit, and it goes without saying that the present invention includes equivalents thereof.

1 Column joint part 10 1st steel column (1st column)
11 First end plate 12 Screw hole 20 Second steel column (second column)
21 Second end plate 22 Through hole 30 First temporary bolt (temporary bolt)
31 First fixed side threaded part (fixed side threaded part)
32 First cylindrical part 33 First tightening side threaded part (tightening side threaded part)
34 First upper end part (upper end part)
34a First tapered part (tapered part)
34b First engaging part (engaging part)
40 Second temporary bolt (temporary bolt)
41 Second fixed side threaded part (fixed side threaded part)
42 Second cylindrical part 43 Second tightening side threaded part (tightening side threaded part)
44 Second upper end (upper end)
44a Second tapered part (tapered part)
44b Second engaging part (engaging part)
50 nuts

Claims (4)

A method for constructing a column joint part that joins a lower first column and an upper second column, the method comprising:
A process of preparing multiple temporary bolts,
installing the temporary bolts in a plurality of screw holes formed in a first end plate provided at the upper end of the first column;
inserting a plurality of temporary bolts into a plurality of through holes formed in a second end plate provided at the lower end of the second pillar;
bringing the second end plate into contact with the first end plate;
temporarily fixing the second pillar to the first pillar by threading nuts onto the plurality of temporary bolts;
The process of rebuilding,
replacing the plurality of temporary bolts with a plurality of permanent bolts;
A method for constructing a column joint portion, comprising the step of fully tightening a plurality of the main bolts. The plurality of temporary bolts include, in order from the upper end, an engaging part that engages with a tightening tool, a fixed side threaded part that threads into the screw hole of the first end plate, and a tightening side that engages with the nut. It has a threaded part,
2. The method of constructing a column joint according to claim 1, wherein the engaging portion has a smaller diameter than the tightening side threaded portion. The tightening tool includes a socket that engages with the engagement portion of the temporary bolt,
The pillar according to claim 2, wherein in the step of installing the temporary bolt, the socket is engaged with the engaging portion, and the temporary bolt is installed in the screw hole using the tightening tool. Construction method for joints. 4. The method for constructing a column joint according to claim 3, wherein the engaging portion of the temporary bolt has a hexagonal shape.