JP2013213351A - Construction method of steel frame structure, and fixing member of steel frame structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To strongly fix a steel frame structure even without using support mortar.SOLUTION: In performing integration by repeating a forming step of a divided steel frame structure Ba and a moving step of laterally sliding and moving the divided steel frame structure Ba on a rail 3C toward an installation part 2, and constructing a steel frame structure B by fixing a column base plate 8 of the steel frame structure B to a foundation part 3A at the installation part 2, an anchor member 10 to which a fixing bolt 11 is screwed from an upper part and a freely vertically movable contact member T to be brought into contact with a lower surface of the column base plate 8 are provided on the lower side of a slid movement route of the column base plate 8, and after sliding and moving the column base plate 8 to a fixing position, the fixing bolt 11 is screwed to a female screw part 10a of the anchor member 10 in the state of being inserted to the column base plate 8, the contact member T is moved upward, and thus the column base plate 8 is fixed to the foundation part 3A in the state of holding the column base plate 8 from upper and lower parts by the fixing bolt 11 and the contact member T.

Description

The present invention includes a forming step of forming a divided steel structure in which the steel structure is divided into a plurality of blocks in an assembly yard, and sliding the divided steel structure horizontally on a rail from the assembly yard toward an installation location. Construction of the steel structure that constructs the steel structure by repeating the moving process to constitute an integral steel structure and fixing the column base plate of the steel structure to the foundation formed at the installation location The present invention relates to a method and a steel structure construction technique such as a steel structure fixing member.
By the way, this type of steel structure construction technology is sometimes called, for example, the slide method or traveling method, and a heavy machine such as a crane is installed in the immediate vicinity of the steel structure to assemble the steel structure. This is done when it is difficult to

As shown in FIG. 6, the construction technique of this type of steel structure is formed with a rail 3 </ b> C using a flat bar on the foundation 3, and the column base plate 8 has a plurality of bolt insertion holes in the outer peripheral area. 8a is provided, and on the lower surface of the central area, a sliding bearing member 8A that can reduce friction with the rail 3C while receiving a load acting on the column base is provided, and the sliding bearing member 8A abuts on the rail 3C. In a state where the steel structure B is placed on the base plate 3, the column base plate 8 is fixed by sliding to the base portion 3 </ b> A of the installation location 2.
In order to fix the steel structure B to the foundation part 3A, although not shown in the drawing, anchor bolts for fixing the column base plate are embedded in the foundation part of the installation location, and the upper end part of the anchor bolt is attached. There is a method of inserting through the bolt insertion hole of the column base plate and fixing with a nut from above, but in this case, the protruding part of the anchor bolt interferes with the column base plate when the steel structure slides In order to avoid this, it takes time to raise and lower the column base plate temporarily. As a construction method that can solve this problem, a construction technique as shown in FIG. 6 can be cited.
In place of the anchor bolt, an anchor member 30 provided with a female screw portion 30a capable of screwing the fixing bolt 11 from above is embedded in the base portion 3A of the installation location 2, and the anchor member 30 is directly above the anchor member 30. The steel structure B is slid so that the bolt insertion hole 8a on the outer peripheral portion of the column base plate 8 is positioned, and the fixing bolt 11 is inserted from above into the bolt insertion hole 8a, so that the female screw portion 30a of the anchor member 30 is inserted. By screwing, the column base plate 8 is fixed to the base portion 3A in a state of being pressed from above with the fixing bolt 11 (see, for example, Patent Document 1).

Japanese Patent Publication No. 5-3493 (Fig. 2)

According to the construction technique of the conventional steel structure described above, the column base plate 8 is supported by the sliding bearing member 8A at the center area of the lower surface, as shown in FIG. When the fixing bolt 11 is attached, the end of the column base plate 8 is pressed downward by the fixing bolt 11, and accordingly, the column base plate 8 has Bending stress remains in effect.
Therefore, for example, if an external force such as an earthquake acts on the steel structure B, the bending stress of the column base plate 8 may be further increased, which is not preferable in terms of the fixing strength of the steel structure B.
Furthermore, since the outer peripheral area of the column base plate 8 is supported in a state where it can be bent, the column base plate 8 may be bent by the vibration and the fixing bolt 11 may be loosened when subjected to vibration such as an earthquake. .
In order to solve these problems, filling the supporting mortar between the column base plate 8 and the base portion 34 is an essential condition. However, it takes time to fill and leads to an increase in cost. Furthermore, for example, when the steel structure is slid again in the direction opposite to that at the time of construction due to rebuilding or dismantling of the steel structure, it takes time and effort to remove the supporting mortar. Will be forced to work.

  Accordingly, an object of the present invention is to solve the above problems and provide a method for constructing a steel structure that can firmly fix the steel structure without using a supporting mortar, and a fixing member for the steel structure. It is in.

  A first characteristic configuration of the present invention includes a forming step of forming a divided steel structure in which the steel structure is divided into a plurality of blocks in an assembly yard, and the split steel structure on the rail from the assembly yard toward the installation location. The steel structure is constructed by fixing the column base plate of the steel structure to the foundation formed at the installation location by repeating the moving process of sliding the sideways to form an integral steel structure. A method of constructing a steel structure, wherein the anchor member on the base portion side having an internal thread portion into which a fixing bolt for the column base plate is screwed from above is brought into contact with the lower surface of the column base plate An abutting member that can be moved up and down is provided below the slide movement path of the column base plate, and after sliding the column base plate to a fixed position, a bolt shaft is attached to the column base plate. The fixing bolt is screwed into the female screw portion of the anchor member in a state where the fixing bolt is inserted, and the abutting member is moved upward so that the column base plate is moved between the fixing bolt and the abutting member. The column base plate is fixed to the base portion while being sandwiched from above and below.

According to the first characteristic configuration of the present invention, when the column base plate slides, the anchor member or the abutting member does not become an obstacle to the movement, and the sliding movement can be allowed smoothly. At the time of fixing, the column base plate can be fixed in a stable state by a simple operation of simply moving the fixing bolt and the contact member.
Therefore, the column base plate can be fixed quickly and efficiently.
Furthermore, since the column base plate is fixed with the fixing bolt and the abutting member sandwiched from above and below, even if the tightening force of the fixing bolt is increased, the preceding bending stress acts on the column base plate. It can be firmly fixed in a state where it is not. As a result, it is not always necessary to fill the supporting mortar between the column base plate and the base portion to increase the supporting force, and it is possible to reduce the construction cost and shorten the construction period.
In addition, the fixing of the column base plate as described above is not limited to the case of finally fixing the steel structure to the foundation, but is temporarily fixed before and after the moving process of each divided steel structure. It is effective also when implemented as above, and the above-mentioned effect can be achieved over the entire construction of the steel structure.

  According to a second characteristic configuration of the present invention, when the steel structure is constructed, the column base plate is fixed to the base portion without providing a support mortar between the column base plate and the base portion. When the steel structure is disassembled, the fixing bolt is removed from the steel structure fixed to the base portion, and the contact member is retracted downward from the column base plate, and the steel structure is removed. Is slid on the rail from the installation location to the assembly yard, and then the steel structure is disassembled.

According to the second characteristic configuration of the present invention, at the time of dismantling the steel structure, there is no need to remove the support mortar, and furthermore, it is simple to remove the fixing bolt and retract the contact member downward. Since the column base plate can be separated from the foundation by operation, the steel structure can be disassembled easily, quickly and economically.
In addition, since the steel structure is moved to the assembly yard and demolished, in addition to being able to quickly open the installation location where the steel structure was originally installed, dust and noise are generated at the installation location. Can be avoided.

  A third characteristic configuration of the present invention is a fixing member for a steel structure for fixing a column base plate of a steel structure to a base portion, and can be embedded vertically in the base portion, and an inner peripheral portion of an upper end portion. And a fixing bolt that can be screwed into the female screw portion by inserting a bolt shaft portion from above the column base plate. And a fixing nut capable of coming into contact with the lower surface of the column base plate by being screwed upward while being screwed into the male screw portion.

According to the third characteristic configuration of the present invention, if the anchor member is embedded in the base portion, the column base plate is fixed in a state where the anchor member, the fixing bolt, and the fixing nut are arranged on the same axis. The column base plate can be firmly fixed by being sandwiched between the bolt and the fixing nut, and the clamping force is not decentered, and the construction method of the steel structure according to claim 1 or 2 is more preferable. And can be carried out efficiently.
Further, between the foundation portion and the column base plate, a bolt shaft portion of the fixing bolt, an anchor member upper end portion to which the bolt shaft portion is screwed, and a fixing nut to be screwed to the outside of the male screw portion of the anchor member, Therefore, the total effective cross-sectional area of the member is large compared to the conventional technology where only the fixing bolt is located (only the bolt shaft part alone), and the bending strength and The shear strength and axial strength can be expected greatly, and the column base plate can be fixed more firmly.

Side view showing construction method of steel structure Sectional view showing the fixation of the column base plate Plan view showing the fixation of the column base plate Sectional drawing which shows the fixed condition of the column base plate of another embodiment Sectional drawing which shows the fixed condition of the column base plate of another embodiment Sectional drawing which shows the fixed condition of the column base plate of a prior art example

  Embodiments of the present invention will be described below with reference to the drawings. In the drawings, the parts indicated by the same reference numerals as those in the conventional example indicate the same or corresponding parts.

FIG. 1 shows a situation where a steel structure B such as a bare roof is formed.
The steel structure B is formed by forming a one-split divided steel structure Ba in the assembly yard 1 and sliding the divided steel structure Ba sideways, and then adding the next span divided steel structure Ba. After that, it is slid again in the same direction, and by repeating them, each divided steel structure Ba is moved to the installation location 2 adjacent to the assembly yard 1 to form the steel structure B having the final shape. Yes.
Such a construction method is often employed when it is not possible to secure a wide construction space in which heavy machinery or the like can be arranged around the entire circumference of the installation location 2 as a construction environment.

The steel structure B is configured by providing pillars 4 and beams 5 made of steel, braces 6, exterior plates (wall materials, roof materials, etc.) 7, and the like.
In this embodiment, the steel structure B is described as an example of a bare roof of a temporary structure. However, the steel structure B is not limited to a temporary structure, and is a permanent structure. May be.

The foundation 3 that supports the steel structure B is provided from the assembly yard 1 to the installation location 2, and extends over a plurality of foundation parts 3A corresponding to the positions of the pillars 4 and the adjacent foundation parts 3A. And a foundation beam 3B provided (see FIGS. 2 and 3). A rail 3C made of a metal strip is laid on the upper surface of the foundation 3, and this rail 3C serves as a support guide for sliding the divided steel structure Ba.
Further, as shown in FIGS. 2 and 3, the column base plate 8 at the lower end of the column 4 is a sliding bearing member that can be placed on the rail 3C on the lower surface of the central area to reduce the frictional resistance. 8A is integrally attached with a bolt.
The sliding bearing material 8A is preferably formed of a material excellent in wear resistance and self-lubricating property, for example, a polyamide-based resin. An example is MC nylon (trade name). Further, the sliding support member 8A can be attached to the column base plate 8 by using an adhesive or by using a combination of the bolt and the adhesive in addition to the above-described bolt. .
Further, as shown in FIG. 2, a plurality of bolt insertion holes 8a through which the fixing member 9 to the base portion 3A can be inserted are provided in the outer peripheral area of the column base plate 8 at intervals in the circumferential direction. .

  The fixing member 9 fixes the column base plate 8 of the steel structure B to the base portion 3A, can be embedded vertically in the base portion 3A, has an internal thread portion 10a on the inner peripheral portion, and has an upper end. An anchor member 10 having a male screw portion 10b on the outer peripheral portion thereof, and a fixing bolt that can be screwed into the female screw portion 10a by inserting a bolt shaft portion 11a into the bolt insertion hole 8a from above the column base plate 8 11 and a fixing nut (an example of a contact member T) 12 that can be brought into contact with the lower surface of the column base plate 8 by being screwed upward while being screwed into the male screw portion 10b. It is.

In the present embodiment, the anchor member 10 is a hexagonal long nut having a basic configuration, the male screw portion 10b is formed at the upper end portion of the outer peripheral portion as described above, and the inner peripheral portion extends over the entire length of the female member 10b. A screw portion 10a is formed. The anchor member 10 is not limited to a hexagonal cross-sectional shape, and may be a quadrangular shape or a circular shape, for example.
An anchor bolt 10c is screwed into the female screw portion 10a from below, and the anchor bolt 10c and the anchor member 10 secure the embedded strength of the foundation portion 3A to the concrete.
As shown in FIG. 2, the anchor member 10 is embedded in the foundation portion 3A so that the upper male screw portion 10b protrudes from the upper surface of the foundation portion 3A. The protruding height dimension is set so that the upper end portion of the anchor member 10 is positioned below the slide movement path of the column base plate 8 and is considered so as not to interfere when the column base plate 8 slides. ing. Specifically, the protruding height dimension is set to be smaller than the total thickness dimension of the rail 3 and the sliding bearing member 8A.

  When the fixing bolt 11 is screwed to the anchor member 10 from above the column base plate 8 through the bolt insertion hole 8a, the fixing length of the fixing bolt 11 is such that sufficient fixing strength of the column base plate 8 to the base portion 3A is obtained. It is set to a length dimension that can be secured.

  The fixing nut 12 is screwed into the male screw portion 10b of the anchor member 10 and screwed downward, and the nut upper end portion is positioned below the slide movement path of the column base plate 8, and It is set to a nut thickness dimension that can secure a screwing length sufficient to obtain sufficient strength to support the column base plate 8 from below in a state where it is screwed upward until it contacts the lower surface of the leg plate 8. Yes.

  Therefore, in a state where the column base plate 8 is slid on the base portion 3A, the fixing bolt 11 is tightened from above and the fixing nut 12 is contacted from below, so that the column base plate 8 is sandwiched from above and below. It can be fixed to the base 3A.

Below, the construction method of the steel structure B is demonstrated.
The outline of the construction of the steel structure B is as follows. The forming process of sequentially forming the divided steel structure Ba in the assembly yard 1 and the rail 3C on the rail 3C from the assembly yard 1 toward the adjacent installation location 2 The steel structure B is formed by repeating the moving process of sliding the frame to the base portion 3A, and the steel frame B is fixed to the base 3A formed at the installation location 2 by fixing the column base plate 8 of the steel structure B. Installation construction of the structure B is completed.

In detail, it implements according to the following procedures.
[1] The base 3 is formed and the rail 3C is fixed thereon. In addition, the anchor member 10 and the fixing nut 12 screwed into the anchor member 10 are provided in the base portion 3A in a state of being positioned below the slide movement path of the column base plate 8.

[2] After the divided steel structure Ba is formed in the assembly yard 1, the distance of one span is slid to the installation location 2 side. It is to be noted that when the divided steel structure Ba is formed, it is preferable that the column base plate 8 is fixed to the anchor member 10 before the work is performed, and the fixation is eliminated during the slide movement.
With respect to the slide movement, as shown in FIG. 1, for example, by a slide jack J in which a steel rod K for slide movement is attached to the divided steel structure Ba and a reaction force is secured on the front side in the slide movement. By pulling the steel bar K, the divided steel structure Ba can be slid forward.

[3] In the assembly yard 1, the divided steel structure Ba for the next span is continuously formed and integrated with the previous divided steel structure Ba to slide to the installation location 2 side for the distance of one span. Let Thereafter, the formation of the divided steel structure Ba and the slide movement are repeated.

[4] After the divided steel structure Ba for the last span is slid, the column base plate 8 is fixed to the base portion 3A using the fixing member 9.
The fixing of the column base plate 8 is not limited to being performed after all the divided steel structures Ba are slid, but is performed every time the divided steel structures Ba are slid for each span. It is preferable to keep it.
Regarding the fixing of the column base plate 8 to the base portion 3A, as shown in FIG. 2, first, before the column base plate 8 reaches the fixing position, the fixing nut 12 is connected to the male screw of the anchor member 10 of the column base plate 8. It is screwed into the portion 10 b and is positioned below the slide movement path of the column base plate 8.
When the column base plate 8 is slid to the fixed position, the fixing bolt 11 is screwed into the female screw portion 10a of the anchor member 10 with the bolt shaft portion 11a inserted through the column base plate 8, and the fixing nut 12 is moved upward. The column base plate 8 is fixed to the base portion 3 </ b> A in a state where the column base plate 8 is sandwiched from above and below by the fixing bolt 11 and the fixing nut 12.
Further, when releasing the fixing, the fixing nut 12 can be screwed downward and the fixing bolt 11 can be removed.
In the fixed state, the column base plate 8 is supported by the sliding support member 8A in the central area, and is supported by the anchor member 10 via the fixing bolt 11 and the fixing nut 12 in the outer peripheral area. A stable support state is ensured, and it is not necessary to fill the support mortar between the column base plate 8 and the base portion 3A. Therefore, even when the fixing of the column base plate 8 is performed, it can be performed easily and quickly without taking time and effort.

In the present embodiment, since the steel structure B is a construction structure, finally, the removal work of the steel structure B is also performed.
The procedure of the removal work is to remove the fixing bolt 11 from the column base plate 8 fixed to the base portion 3A, and with the fixing nut 12 retracted downward from the column base plate 8, the steel structure B is installed at the installation location. After the slide movement on the rail 3C from 2 to the assembly yard 1, the steel structure B is disassembled.

  According to the construction method of the steel structure of this embodiment, in addition to being able to construct the steel structure B quickly and efficiently, it is possible to more firmly fix the foundation portion 3A. Further, when the steel structure B is disassembled, the steel structure B can be smoothly slid and moved to the assembly yard 1 for quick and efficient work.

[Another embodiment]
Other embodiments will be described below.

<1> The steel structure B is not limited to a temporary steel structure such as a bare roof described in the previous embodiment, and may be a permanent steel structure. Moreover, how to divide a plurality of blocks is not limited to the previous embodiment, and can be arbitrarily set.
<2> The contact member T is not limited to the fixing nut 12 described in the previous embodiment. For example, as illustrated in FIG. 4, the embedded bolt 13 configured separately from the anchor member 10. You may comprise with the fixing nut 14 which can be screwed together at the upper end part of this.
Moreover, as shown in FIG. 5, you may comprise with the fixing bolt 16 which can be screwed together to the embedding bag nut 15 comprised separately from the anchor member 10. As shown in FIG.
In short, the abutting member T is a member that can be moved up and down to abut on the lower surface of the column base plate, and is fixed with the fixing bolt screwed into the female screw portion of the anchor member from above and below. What is necessary is just to be able to fix in the state inserted | pinched, and they are named generically and it is called a contact member.
<3> The anchor member 10 is not limited to one in which the anchor bolt 10c is screwed to the female screw portion 10a described in the previous embodiment, and the anchor member 10 includes an anchor bolt portion integral with the anchor member 10. The thing which provided the some protrusion part which can anticipate the embedding effect with respect to concrete in the outer peripheral part of the thing or the anchor member 10 may be sufficient.

  In addition, as mentioned above, although the code | symbol was written in order to make contrast with drawing convenient, this invention is not limited to the structure of an accompanying drawing by this entry. In addition, it goes without saying that the present invention can be carried out in various modes without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 1 Assembly yard 2 Installation location 3A Base part 3C Rail 8 Column base plate 10 Anchor member 10a Female thread part 10b Male thread part 11 Fixing bolt 11a Bolt axial part 12 Fixing nut (an example of contact member T)
B Steel structure Ba Split steel structure T Contact member

Claims (3)

A forming step of forming a divided steel structure in which the steel structure is divided into a plurality of blocks in an assembly yard, and a moving step of sliding the divided steel structure horizontally on the rail from the assembly yard toward the installation location. Repeat to form an integral steel structure,
A steel structure construction method for constructing the steel structure by fixing the column base plate of the steel structure to the foundation formed at the installation location,
An anchor member on the base portion side provided with a female screw portion into which the fixing bolt for the column base plate is screwed from above, and a contact member that can be moved up and down to contact the lower surface of the column base plate, Provided below the slide movement path of the column base plate,
After the column base plate is slid to the fixed position, the fixing bolt is screwed into the female screw portion of the anchor member in a state where the bolt shaft portion is inserted through the column base plate, and the contact member is The construction method of the steel structure which fixes the said column base plate to the said base part in the state which clamps the said column base plate from the upper and lower sides by the said fixing bolt and the said contact member by moving upwards.   At the time of constructing the steel structure, the column base plate is fixed to the base portion without providing a supporting mortar between the column base plate and the base portion, and at the time of dismantling the steel structure, The fixing bolt is removed from the steel structure fixed to the foundation, and the steel structure is moved from the installation location to the assembly yard in a state where the contact member is retracted downward from the column base plate. The construction method of the steel structure according to claim 1, wherein the steel structure is disassembled after sliding on the rail. A steel structure fixing member that fixes the column base plate of the steel structure to the foundation,
An anchor member that can be vertically embedded in the base portion, has an internal thread portion on the inner peripheral portion of the upper end portion, and has an external thread portion on the outer peripheral portion of the upper end portion;
A fixing bolt that can be screwed into the female screw portion by inserting a bolt shaft portion from above the column base plate;
A fixing member for a steel structure comprising a fixing nut capable of coming into contact with the lower surface of the column base plate by being screwed upward while being screwed into the male screw portion.

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