JP3103290B2 - Pillar steel frame and steel frame connection method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method of connecting the steel and steel used in the pillars of steel reinforced concrete structures.

[0002]

2. Description of the Related Art The steel frame of a steel reinforced concrete structure is:
Generally, the upper steel frame is lifted by a crane or the like, and the upper steel frame is aligned with the upper steel frame's lower steel surface so that the upper steel plate is erected from the floor slab. They are connected by splice plates or joints, bolts and nuts.

[0003] The construction of the upper steel frame, that is, the adjustment of the posture,
With the upper and lower steel frames temporarily fixed with a connecting plate, bolts and nuts, a tension member with a turnbuckle is laid in an X-shape on the horizontally adjacent steel frame being built, and hydraulic jacks, wedges, split arrows It is performed by tightening the tendon with a turnbuckle while correcting the verticality by using the method.

However, according to the conventional method, it is necessary to prepare in advance equipment such as a hydraulic jack, which is not clear whether it is actually used or not. Distortion must be corrected by taking it from steel, and it is difficult to improve construction accuracy.Dangerous temporary columns, that is, unstable steel frames such as the work of attaching a tensioning agent to the top of steel frames during connection There is a problem that work at a high place is required at the upper part of the building.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to enable a steel frame to be safely, accurately and easily installed without working at height.

[0006]

A steel frame for a pillar according to the present invention comprises a steel frame having a pair of elongated flat plate-shaped flange portions at opposing locations, and one of the flange portions at least at one end in the longitudinal direction in the width direction . Side and the other side
And a plate-like projection protruding from the side surface.

The jig used for connecting the steel frame is an elongated annular body having an elongated space, which has a screw hole reaching the space from one end in the longitudinal direction thereof, and is screwed into the screw hole. It may include a threaded rod that is.

In the method of connecting the above-mentioned steel frames using the above-mentioned jig, the lower end of the second steel frame is connected to the upper end of the first steel frame built so that the side of the projecting piece faces upward. Each jig is fitted to the pair of projecting pieces so that the pair of projecting pieces of the upper and lower steel frames are received in the space of the annular body in accordance with the state where the piece is downward, and before, simultaneously with, or After this, the first and second steel frames are temporarily fixed by the plurality of joint plates and the plurality of screw members, and thereafter, the amount of screwing of the screw rod into the annular body is adjusted to form the second steel frame. The method includes adjusting a posture, and a protrusion is formed on an upper end surface of the first steel frame or a lower end surface of the second steel frame.

When the upper and lower steel frames are overlapped, a gap corresponding to the protrusion is formed between the flange portions of the two steel frames.
Therefore, when the screwing amount of the threaded rod into the annular body is changed, the upper steel frame is inclined with respect to the lower steel frame so that the upper and lower projecting pieces of the steel frame approach or separate. Therefore, according to the present invention, since the posture of the upper steel frame can be adjusted by adjusting the amount of screwing of the screw rod into the annular body, the reaction force for posture adjustment can be adjusted from the steel frame being built. There is no need to take it, there is no need to use hydraulic jacks, wedges, splitters, etc., and there is no need to perform high-place work, such as the work of hanging a tendon in an X-shape on horizontally adjacent steel frames.

It is preferable that each protruding piece has a groove on the surface on the side of the central portion in the longitudinal direction of the flange portion. Thereby, it is possible to reliably prevent the jig from coming off the protruding piece.

In a preferred embodiment, the screw hole of the jig extends in a direction having a predetermined angle with respect to the longitudinal direction and the width direction of the space. Thereby, regardless of the presence of the flange portion, the screw rod can be easily turned around the annular body by a wrench or the like.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS. 1-4, each steel frame 10 for a steel reinforced concrete structure includes a steel frame body 12 having a length dimension corresponding to a height dimension for a plurality of floors. The steel frame body 12 includes an elongated flat plate portion 14 and an elongated flat plate-like flange portion 16 integrally provided at each edge in the width direction of the flat plate portion.
And a cross-sectional shape obtained by combining a pair of members formed into an H shape or an I shape in a cross shape. Each flange 16
As shown in FIG. 4, a plurality of holes 1
8 are formed.

Each of the flange portions 16 is provided with a protruding piece 20 in the shape of a rectangular plate on each side surface in the width direction at both ends in the longitudinal direction. Each protruding piece 20 protrudes from the corresponding side face, and is slightly retracted from the end face of the main body 12 toward the center in the longitudinal direction. Each protruding piece 20 has a concave portion, that is, a groove 22 on a surface of the flange portion 16 on the central side in the longitudinal direction. Each projecting piece 20 provided on one end side of the steel frame 10
Has a larger width than each protruding piece 20 provided on the other end side, and has a hole 24 used for hanging a steel frame.

Each jig 30 for connecting the steel frame 10 includes:
An elongated annular body 32 and a threaded rod 34 screwed into the annular body;
And The annular body 32 has an elongated space 36 having a width slightly larger than the thickness of the protruding piece 20 of the steel frame 10, and a screw hole 38 reaching the space 36 from one longitudinal end of the annular body 32. The screw hole 38 extends in a direction having a predetermined angle with respect to the longitudinal direction and the width direction of the space 36.
The screw rod 34 is screwed into the screw hole 38.

Of the steel frames 10 to be connected, the lower steel frame 1
0 is built so that the upper end protrudes upward from the floor slab, preferably, the upper end protrudes upward from the floor slab by about 1 to 1.5 m. A plurality of connecting plates 40 are provided on the flange portion 16 of the lower steel frame 10 by a plurality of bolts 4.
Temporarily fixed by two and a plurality of nuts 44. Each connecting plate 40 has a part thereof projecting upward from the corresponding flange portion 16. Each bolt 42 is connected to the flange 16
And the connecting plate 4 corresponding to the hole 18.
0 and a hole 46 formed in the hole.

A projection 48 is formed on the upper surface of the lower steel frame 10. In the example shown, the protrusion 48 is a small piece fixed to the upper surface of the steel frame 10 by welding. However, the protrusion 48 may be a part of the steel frame main body 12. Steel frame 10
Is preferably the position of the center of gravity in the cross section of the steel frame 10, but may be another position.

The upper steel frame 10 is lifted by a crane using a hole 24, preferably a crane equipped with a remotely operable clamp, and the lower surface of the lower steel frame 10 is lifted.
And is temporarily fixed to the lower steel frame 10 by the joint plate 40, the bolts 42 and the nuts 44 in this state.
Thereby, the projecting pieces 20 of the upper and lower steel frames 10 are vertically aligned.

First, each jig 30 receives the aligned upper and lower projecting pieces 20 into the space 36 before, simultaneously with, or after the temporary fixing of the upper and lower steel frames 10, and the screw rod 34 faces upward. Further, the steel bar 10 is attached to the pair of the projecting pieces 20 so that the tip of the threaded rod 34 is closer to the flange 16 than the head.
Is fitted from the side.

Next, in each jig 30, the lower end of the annular body 32 is located in the groove 22 of the lower projecting piece 20, and the tip of the screw rod 34 is located in the groove 22 of the upper projecting piece 20. Thus, the screw rod 34 of each jig 30 is screwed into the screw hole of the annular body 32. Thereby, each jig 30 is, as shown in FIG.
The upper and lower projecting pieces 20 are sandwiched between the lower end of the annular body 32 and the tip of the screw rod 34.

In the state shown in FIG.
Flange 16 has a gap L corresponding to the thickness of the projection 48.
Having. For this reason, when the screwing amount of the screw rod 34 into the annular body 32 is increased, the upper steel frame 10 is tilted so that the projecting pieces 20 of the upper and lower steel frames 10 approach, and the screwing amount of the screw rod 34 into the annular body 32 is reduced. When it is made smaller, the upper and lower steel frames 10
The upper steel frame 10 is tilted in the opposite direction so that the protruding pieces 20 are separated.

Therefore, the screw rod 3 of each jig 30 is
4 by adjusting the screwing amount of the upper steel frame 10.
Is adjusted. The posture of the upper steel frame 10 reduces the screwing amount of the screw rod 34 of at least one jig 30, and the other jig 30 facing the jig 30.
It is adjusted by performing the operation of increasing the screwing amount of the threaded rod 34 one or more times. In this case, there is no need to take the reaction force for posture adjustment from the steel frame being built.

When the posture of the upper steel frame 10 is adjusted, each set of the bolts 42 and the nuts 44 is tightened tightly, the upper steel frame 10 and the lower steel frame 10 are connected, and each jig 30 is removed. . The wire extending from a crane or the like suspending the upper steel frame 10 is detached from the steel frame 10 at an arbitrary time after the upper and lower steel frames 10 are temporarily fixed.
However, until the connection of the steel frame 10 is completed, the upper steel frame 1
0 may be kept suspended by a crane or the like.

As a suspending machine such as a crane for suspending a steel frame, if a suspending machine capable of remotely removing a clamp engaged with an upper portion of the steel frame from the steel frame is used,
The worker does not need to climb the upper part of the suspended unstable steel frame and remove the clamp of the suspension machine from the steel frame.

After the upper and lower steel frames have been connected as described above, and the walls and floor have been constructed, the above steps are repeated.

With the use of the above-described protruding piece 20 and the jig 30, there is no need to remove the reaction force for adjusting the posture from the steel frame being built, and it is not necessary to use a hydraulic jack, a wedge, a split arrow, or the like. In addition, there is no need to perform high-place work such as a work of hanging a tendon in an X-shape between horizontally adjacent steel frames. Further, the tip of the screw rod 34 is closer to the flange 1 than the head.
If the jigs 30 are arranged on the steel frame 10 so as to be on the side of 6, the screw rod 34 can be easily rotated with respect to the annular body 32 using a wrench or the like.

The upper and lower steel frames 10 are connected to their flange portions 1.
In addition to the connection at 6, the flat portion 14 may be connected by a plurality of joint plates, bolts, and nuts. Further, the upper and lower steel frames 10 may be finally connected by studs, welding, or the like.

According to the present invention, other cross-sectional shapes such as a steel frame having an H-shaped or I-shaped cross-sectional shape, a steel frame having a pair of members having an H-shaped or I-shaped cross-sectional shape crossed at an angle other than 90 degrees, and the like are described. The present invention can be applied to a steel frame having the same.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a steel frame, a projection and a jig used in the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a side view showing one embodiment of a jig used in the present invention.

FIG. 4 is a diagram for explaining a connection method of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Steel frame 12 Main body of steel 14 Flat plate part 16 Flange part 18 Hole for bolt 20 Protrusion piece 22 Groove 30 Jig for connection 32 Annular body 34 Screw rod 36 Space 38 Screw hole 40 Joint plate 42 Connection bolt 44 Nut 46 Bolt Hole for 48 projection

Continuation of the front page (72) Inventor Hidehiko Watanabe 2-1 Tsukudo-cho, Shinjuku-ku, Tokyo Co., Ltd. Kumagaya Gumi Tokyo headquarters (56) References JP-A-8-105208 (JP, A) JP-A-8- 177237 (JP, A) Japanese Patent Application Laid-Open No. 8-120941 (JP, A) Japanese Patent No. 3015910 (JP, B2) Japanese Patent No. 2882662 (JP, B2) Japanese Patent Publication No. 6-80270 (JP, B2) , Y2) (58) Field surveyed (Int.Cl. ⁷ , DB name) E04G 21/18

Claims (2)

(57) [Claims] 1. A steel frame having a pair of elongated flat plate-shaped flange portions at opposing positions, and one side surface and the other side surface in a width direction of at least one longitudinal end of each of the flange portions. And a plate-shaped protruding piece protruding from the side surface. 2. A steel frame having a pair of elongated flat plate-shaped flange portions at opposing locations, and one side surface and the other side surface in the width direction of at least one longitudinal end of each of the flange portions. And a plurality of pillar steel frames including a plate-shaped protruding piece protruding from the side surface, an elongated annular body having an elongated space, and an annular body having a screw hole reaching the space from one end side in the longitudinal direction thereof. It is a method of connecting using a plurality of jigs including a screw rod screwed into the screw hole, wherein at the upper end of a first steel frame built so that the side of the projecting piece is upward, The lower end of the second steel frame is adjusted so that the projection is downward, and each jig is fitted to the pair of projections so as to receive the pair of upper and lower steel frames into the space of the annular body, Before this, at the same time or after this The first and second steel frames are temporarily fixed by the plurality of joint plates and the plurality of screw members, and then the amount of screwing of the screw rod into the annular body is adjusted to adjust the posture of the second steel frame. The upper end face of the first steel frame or the second steel frame.
A method of connecting steel frames, wherein a protrusion is formed on the lower end surface of the steel frame.