JPH07292992A - Method for assembling steel structure and centering pin for use therein - Google Patents

Abstract

PURPOSE:To make adjustments easily and to reduce construction period by increasing the efficiency of a tightening operation for main bolts. CONSTITUTION:In a method for assembling a steel structure 1 by bolting beams 3 to columns 2, first and second bolt mounting portions, 5, 6, respectively, each having a plurality of bolt holes 4 whose centers are aligned to adjust first and second members, are formed, respectively, in each column 2 and each beam 3. The first bolt mounting portion 1 of each bolt 2 with one end previously and temporarily held in place, is laid on the second bolt mounting portion 6 of the beam 3 to be assembled to the column 2. The body of a centering pin 7, which has a shank, a tapered portion and an expanded portion, is inserted from the tapered portion into one of the bolt holes 4 that face each other during centering, and a bolt smaller in diameter than the bolt holes is passed through and bolted to the other, opposite bolt hole 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention facilitates building adjustment,
In addition, the present invention relates to a method for assembling a steel structure capable of efficiently tightening the bolts and greatly shortening the construction period, and a centering pin used for the method.

[0002]

2. Description of the Related Art Generally, a steel frame structure of a building such as a building, a condominium, a bridge is assembled by sequentially connecting a plurality of members by bolts, and based on the steel frame structure, a wall material,
A building is completed by properly installing various members such as floor materials and bridges. When assembling this steel structure, it is extremely important that the entire building be constructed vertically.

For example, in assembling a steel frame structure, in the construction of a steel structure, according to the standards of the Japan Architectural Institute (see JASS6 "Steel frame construction" section 6.10.6 Construction) a) Temporarily join the members with a predetermined number of bolts,
(B) It is said that even during the erection process, the erection process is inspected and the erection process proceeds while the erection process is being modified, and c) this joint is erected, and the strain is completely corrected before it is applied. In addition, the erected members must be securely tightened immediately using temporary tightening bolts, and the number of them is about 1/3 of the joint hole (bolt hole) if the safety is not confirmed by calculation. In addition, it is stipulated that the number should be two or more.

That is, as shown in FIG. 9, when the column a and the I-shaped steel connection beam d are temporarily joined, twelve bolt holes g are respectively formed in the beam attachment portion f of the column a and the web b of the beam d. Is opened, at least four temporary tightening bolts m1
The column a and the connection beam d are temporarily tightened by using ~ m4 to secure the safety of the frame under an unstable condition on the way of construction.

At this time, the bolt holes g formed in the beam attachment portion f and the web b of the beam d do not always match completely.
That is, since the cores are not aligned, the temporary tightening bolts m1 to m4 have a diameter slightly smaller than the diameter of the bolt hole g in order to facilitate the insertion.
Therefore, it is not necessary to tighten the web b so that it is in close contact.

After completion of this building, the main pillars are plumbed to check whether the entire building is constructed vertically.
After correcting the distortion using wire rope, turnbuckle, etc., so-called "building" is reinserted and the required erection accuracy is obtained, and then the temporary fastening bolts m1 to m4 are brought into close contact with the beam attachment part f and the web b. Tighten until the skin fits and hold the position of each steel frame member that has been built.

Thereafter, a drift pin having a diameter equal to the diameter of the bolt hole g and having a tapered tip is driven into the bolt hole g into which the temporary fastening bolts m1 to m4 are not inserted, and the bolt hole g Perform centering.

When the cores of the bolt holes g are aligned, the main bolts having the same outer diameter as the bolt holes g are sequentially tightened in the bolt holes facing each other, and the already tightened temporary tightening bolts m1 to m4 are removed. Tighten this bolt. Finally, the drift pin is pulled out, tightened with a main bolt, and the flange e of the column and the flange c of the beam d are welded to complete the steel structure.

[0009]

However, in such an assembling method as in the prior art, the number of bolt holes formed in the members to be joined increases, so that the required number of temporary fastening bolts also increases, and as a result, The time required to install and remove the tightening bolts increases, leading to a longer construction period. Moreover, most of the twists of the temporary tightening bolts are damaged when the temporary tightening bolts are built, and after being pulled out, the temporary tightening bolts become unusable and reduce the yield.

Further, in recent years, with the remarkable development of the processing technology and the measurement technology, the processing accuracy has been remarkably improved, and in the joint or the like, the pillar a and the beam d are accurately aligned by aligning the bolt holes with each other. The current situation is that the buildings can be aligned by aligning the cores.

In spite of the present situation, in the conventional assembling method, when the building is reinserted, the temporary tightening bolt having a diameter slightly smaller than that of the bolt hole is used for temporary assembly. The problem of misalignment in either the horizontal or vertical direction occurs, and it takes a long time to complete the steps from building adjustment to tightening the bolts.
Moreover, the efficiency of the final tightening work is reduced due to difficulty in inserting the main bolt.

In view of the above problems, the inventor of the present invention
A pin body that closely fits is inserted into one bolt hole of a pillar or beam, and a bolt with a diameter smaller than the outer diameter of the bolt hole is inserted into the other one bolt hole to fix the nut. (EN) A steel frame structure assembling method and a centering pin used for the same, which can facilitate adjustment, efficiently perform tightening work of the bolts, can significantly shorten the construction period, and can solve the above problems. Has an aim.

[0013]

The invention according to claim 1 is
A method of assembling a steel frame structure, wherein a beam member is bolted to a pillar to assemble a steel frame structure, the method comprising a plurality of bolt holes capable of aligning a pillar and a beam member by aligning hole cores with the pillar and the beam member. First and second bolt mounting portions are respectively formed, and first bolt mounting portions of a pillar whose one end is temporarily fixed in advance are formed.
The second bolt mounting portion of the beam member to be assembled to this pillar is overlapped, and a barrel portion that closely fits into the bolt hole is inserted into one bolt hole facing each other at the time of centering, and an insertion formed at one end of this barrel portion. The pin body of the centering pin provided with the retaining portion is inserted into the pin body having the tapered portion for use in the body and the bulging portion formed at the other end of the body portion, and is removed from the tapered portion. A method of assembling a steel frame structure, which includes a temporary assembling step for stopping and stopping, and inserting a bolt having a diameter smaller than this bolt hole into another facing bolt hole and fixing the nut.

According to a second aspect of the present invention, the pillars and beams are adjusted in the erection in the temporary assembling step, and bolts are fitted in the facing bolt holes aligned by the erection adjustment after the temporary assembling step. A method for assembling a steel structure, comprising a main assembly step of inserting a main bolt having a diameter substantially the same as that of the hole and fixing the nut.

According to a third aspect of the present invention, there is provided a centering pin used in a method for assembling a steel frame structure in which a beam material is bolted to a column to assemble a steel frame structure, the centering pin being provided at a bolt mounting portion of the column and the beam material. , A pillar by aligning the cores of the pillars and beams by fitting the cores of the plurality of bolt holes facing each other tightly fitted into one bolt hole, and a tapered portion for insertion formed at one end of the trunk portion, A centering pin characterized in that a retaining member is provided on a pin body having a bulged portion formed at the other end.

[0016]

According to the assembling method of the first aspect, by using one centering pin and one temporary tightening bolt in the temporary assembling step of connecting the column and the beam member, the temporary tightening bolt is used. The number can be greatly reduced, and the work time required for tightening and removing it can be reduced.

Further, the centering pin has a body portion that can be tightly fitted in the bolt hole, and the temporary tightening bolt has a diameter smaller than the diameter of the bolt hole. Since the centering pin can be used as a fulcrum to swing by a small angle while maintaining the centered state of the bolt hole, it is possible and easy to perform the building adjustment work.

According to the second aspect of the present invention, as a result of performing the main assembly step of inserting the main bolt into each of the facing bolt holes centered by the building adjustment in the temporary assembly step and fixing the nut, The bolt can be easily inserted into the bolt hole and can be tightened, and the bolt tightening work can be performed efficiently.

According to the third aspect of the present invention, the centering pin used in the assembling method is closely packed in one bolt hole facing each other of the plurality of bolt holes provided in the bolt mounting portions of the pillar and the beam member. A centering pin in which a pin body having a body portion to be fitted therein, a tapered portion for insertion, and a bulge portion is provided with a retaining portion is used to facilitate insertion into a bolt hole, and
It is possible to align the cores of the three bolt holes and prevent the centering pin from falling out when adjusting the building.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. The method for assembling a steel structure according to the present invention includes a pillar 2 for a steel structure.
This is a method of assembling a steel structure by bolting the beam member 3 to.

A first bolt mounting portion 5 having a plurality of bolt holes 4A and 4B for aligning the pillar 2 and the beam 3 by aligning the cores of the columns and the beams 2 and 3, respectively.
The second bolt mounting portion 6 is formed, and in this embodiment, there are 12 bolt holes 4A and 4B, and the hole diameter ds is 23.5.
mm is shown.

The lower ends of the pillars 2 are temporarily fixed in advance to the fixed pillars 25 that have been constructed, and the first pillars are set at a plurality of heights.
In this example, the bolt mounting portions 5 of the
The bolt mounting parts 5 of are welded to the surface at an equal angle pitch.

The beam 3 is made of I-shaped steel, and
A second bolt mounting portion 6 having the plurality of bolt holes 4B is formed on the web, and the beam member 3 is lifted by a crane to form the first bolt mounting portion 5 of the pillar 2 and the beam. The second bolt mounting portion 6 of the material 3 is overlapped and each bolt hole 4A,
Position so that 4B substantially matches.

Next, the centering pin 7 is inserted into any one of the bolt holes 4A and 4B facing the pillar 2 and the beam 3 in the centering.

As shown in FIGS. 1 to 3, the centering pin 7 has a body portion 9 that is tightly fitted in the bolt hole 4, and a taper portion for insertion that has a small diameter at one end of the body portion 9 toward the tip. The pin body 12 has a bulge portion 11 that has a bulge portion 11 at the other end and that has a bulge portion 11 at the other end.

The outer diameter dp of the body portion 9 has an outer diameter substantially equal to the diameter ds of the bolt hole 4, and the axial length thereof is equal to the first bolt mounting portion 5 and the second bolt mounting portion. It has about twice the combined thickness of 6 and 6.

The retaining portion 13 is, in this example, a small hole 13B.
And a split pin 13A which is inserted into the small hole 13B and which opens the pair of free ends, and after the centering pin 7 is inserted into the bolt hole 4, the slip-out prevention is applied to thereby perform the building adjustment work. It is possible to prevent the centering pin 7 from falling out of the bolt hole 4.

As a material for such an alignment pin 7, it is preferable to quench carbon steel for machine structural use, and to quench harden S40C to S50C (according to JIS G4051) after processing the shape.

Then, the centering pin 7 is inserted into the bolt hole 4 from the taper portion 10, and the bulging portion 11 at the other end is driven in with a hammer or the like, and the body portion 9 of the centering pin 7 is closely inserted. So that one facing bolt hole 4A, 4A
B can be centered.

Another one of the facing bolt holes 4A, 4B
Then, a temporary bolt 14 having a diameter smaller than the bolt hole diameter is inserted and temporarily fixed with a nut 15. The temporary bolt 14 has an outer diameter de of 22 mm, which is 1.5 mm smaller than the bolt hole of 23.5 mm. This temporary bolt 1
The first member 2 by fixing the nut using one 4
The second member 3 and the second member 3 can be brought into close contact with each other to match the skin, and insertion and tightening of the main bolt 16 described later can be performed easily and reliably.

The temporary fixing using the temporary bolt 14 may be performed before or after inserting the centering pin 7 into the bolt hole 4, but the temporary fixing with the temporary bolt 14 may be performed before inserting the centering pin 7. This is preferable in that the pillar 2 and the beam 3 are not separated by the impact when the centering pin 7 is driven, and the work can be performed safely.

Further, in the present embodiment, when the centering pin 7 is driven before being fixed by the temporary bolt 14, the centering pin 7 is inserted from the side of the beam 3 toward the side of the column 2 and driven in. The pillar 2 and the beam 3 are prevented from separating from each other.

The steel frame structure 1 is assembled by performing the above temporary assembly at each joint, and a wire rope or the like is stretched over the steel frame structure 1 to appropriately adjust the vertical and horizontal distortions. .

Thus, according to the assembling method of the present invention,
The number of temporary bolts used is reduced by performing a temporary assembly for building adjustment using the centering pin 7 of one book and one temporary bolt 14, and as a result, it is necessary to tighten and remove the temporary bolt 14. The working time can be greatly reduced.

Further, in the adjustment of the building, the beam 3 can be rocked with respect to the pillar 2 at a slight angle to repair the building.
Moreover, the bolt holes facing each other can be aligned with each other, so that the work of adjusting the building can be facilitated.

After the building is adjusted, a main assembly step of inserting a main bolt 16 having substantially the same diameter as the bolt hole diameter ds into the corresponding bolt holes 4 aligned with each other and fixing the nut is performed. In this example, the main bolt 16 is Among the so-called high tension bolts, torcia type high strength bolts (hereinafter simply referred to as “high strength bolts”
22) is used.

As shown in FIG. 3, the high-strength bolt 22 has a pin tail 22 formed by forming a fracture groove 22A at the tip of the bolt screw.
B is a round-headed bolt formed in a protruding manner, and is fixed to this with a hexagonal nut 23 through a plain washer. Also, the hexagon nut 23
The exclusive wrench 24 is used to take out the reaction force of the tightening torque to the pin tail 22B portion, and when the reaction force reaches a predetermined torque, the breaking groove 22A is twisted and broken. Therefore, in principle, the bolt tightening torque can always be set to a torque at which the breaking groove 22A breaks, and the set tightening force can be guaranteed.

At this time, in order to ensure accurate tightening of the high-strength bolt, the first and second bolt mounting portions 5,
It is assumed that 6 and 6 are in close contact with each other
According to the assembling method of the present invention, not only the centering pin 7 but also one temporary bolt 14 is temporarily fixed. As a result, by tightening this, the first and second bolt mounting portions can be brought into close contact with each other, resulting in high strength. Helps to properly install the bolt.

After inserting the high-strength bolts 22 into all the vacant bolt holes 4 and fixing the nuts, the temporary bolts 14 and the centering pins 7 are removed to remove the high-strength bolts 2.
As shown in FIG. 4, tightening 2 completes the main assembly process.

When joining the fixed column 25 and the column 2, the joining plate 26 is previously fixed to the gusset plate 27A of the fixed column 25 with the high-strength bolts 22 or temporary bolts.
The joint plate 26 can be assembled by overlapping the gusset plate 27B of the pillar 2.

[0041]

Concrete Example Next, a concrete example in which the assembling method of the present invention is embodied will be described. The present invention was evaluated by examining the force generated at the joint between the column and the beam of the joint during the construction of the steel frame construction.

Assume a model case as shown in FIG. In this model case, the K1 section has already been erected, and the main joining of the column and beam members has been completed. In addition, K2 section is under construction and will be 4 beams. Each pillar 2B has an elongated shape in which the beam members 3 can be temporarily assembled in four steps, and a joining plate 26 is used for joining to the pillar 2A as shown in FIG.

Table 1 shows the dimensions of each member and the applied load. The horizontal load F3 to F6 is 4
We assumed about 0 m (or earthquake with horizontal seismic intensity k = 0.1).

[0044]

[Table 1]

[Alignment pin]

[Table 2] The specifications are shown in. When calculating the shear strength, the loading force acting on the centering pin 7 was short-term.

[0046]

[Table 2]

The results of analysis of the bending moment, shearing force, and axial force acting on the columns and beams respectively are shown in FIGS.
From this figure, the total stress acting on the first and second bolt mounting portions is 3.70 t, which is the maximum value of the shearing force acting on the beam.
Then, the square root of the sum of the square of the maximum value of the axial force of 3.44t is taken to be 5.1t, and the force acting on the bolt mounting portion is equal to or less than the shearing strength of the centering pin. Was confirmed to be sufficiently safe work.

[0048]

As described above, in the method for assembling the steel structure according to the first and second aspects, by reducing the number of temporary bolts used, it is possible to reduce the tightening and removing time and to efficiently perform the building adjustment. . Also, if the building adjustment is correct, the bolt holes can be aligned with each other, and it is easy to insert a main bolt that is substantially the same as the bolt hole, and the main tightening process is streamlined. Further, by using the centering pin according to the third aspect, it is possible to facilitate the centering of the bolt hole and the building adjustment, and prevent the centering pin from dropping during the building adjustment.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a front view showing an embodiment of the present invention.

FIG. 3 is a cross-sectional view for explaining the operation of the present invention.

FIG. 4 is a cross-sectional view for explaining the operation of the present invention.

FIG. 5 is a diagram illustrating a model case.

FIG. 6 is a moment diagram of a model case.

FIG. 7 is a shear force diagram of a model case.

FIG. 8 is an axial force diagram of a model case.

FIG. 9 is a front view for explaining a conventional technique.

[Explanation of symbols]

 1 Steel frame structure 2 Pillar 3 Beam material 4 Bolt hole 5 First bolt mounting part 6 Second bolt mounting part 7 Centering pin 9 Body part 10 Tapered part 11 Bulging part 12 Pin body 13 Lock-out part 14 Small diameter bolt 15 nuts 16 bolts 17 nuts

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hideki Maeda 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Construction Co., Ltd. (72) Inventor Yukini Nambu 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Construction Within the corporation

Claims (3)

[Claims] 1. A method of assembling a steel frame structure, wherein a beam member is bolted to a pillar to assemble a steel frame structure, wherein a plurality of pillars and beam members can be fitted by aligning a hole core with the pillar and beam member. First and second bolt mounting portions each having a bolt hole are formed, and one end of the pillar is temporarily fixed in advance, and the second bolt mounting portion of the beam member to be assembled to the pillar is formed. And a barrel portion closely fitted in the bolt hole, a taper portion for insertion formed at one end of the barrel portion, and an insertion taper portion formed at the other end of the barrel portion. The pin body of the centering pin provided with the retaining portion is inserted into the pin body having the bulging portion and the retaining portion, and the retaining body is retained, and the bolt body is inserted into another facing bolt hole. Is a bolt with a diameter smaller than the hole diameter inserted? Method of assembling a steel structure, which comprises a temporarily assembled steps for adjustment situated nut fixing. 2. The pillars and beams are adjusted in the building in the temporary assembling step, and the facing bolt holes centered by the building adjustment subsequent to the temporary assembling step have the same diameter as the bolt holes. The method for assembling a steel structure according to claim 1, further comprising a main assembly step of inserting a bolt and fixing a nut. 3. A centering pin used in a method for assembling a steel frame structure in which a beam member is bolted to a column to assemble a steel frame structure, the pin being provided at a bolt mounting portion of the column and beam member, and by aligning hole cores. A body part that tightly fits into one facing bolt hole of a plurality of bolt holes that match the construction of pillars and beam members, an insertion taper part formed at one end of this body part, and an expansion part formed at the other end. A centering pin, wherein a pin body having a projecting portion is provided with a retaining portion.