JPH02252830A - Pre-fabricated cruciform beam construction method - Google Patents

Abstract

PURPOSE:To save execution of works by inserting band reinforcement for a column into an opening section in the web of one steel framed beam, inserting it through into an opening section in the web of the other steel framed beam so as to assemble a cruciform beam unit, and thereby setting the unit onto the column top section of a floor constructed already so as to be combined together with a beam adjacent to it. CONSTITUTION:Each opening section 2 is provided for the center sections of the webs 1 of steel framed beams A and B in a H-shape cross section, and end section plates 3 are welded onto each opening section 2. Then, a band reinforcement 7 is inserted into the opening section 2 of one beam A, and is inserted through into the opening section 2 of the other beam B to the extent of a specified position so as to be temporarily fastened with a bolt so that a cruciform unit is thereby assembled. Then, the unit is set onto the column top section of a RC column C at a floor constructed already in such a way that the reinforcement 7 is coupled with column reinforcements 15, after it has been connected with the beam for an unit adjacent to it, a floor board D is thereby installed. By this constitution, execution of works can be saved while minimum continuity is maintained among the column at the upper and lower floors and the beams mutually adjacent to each other.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a beam unit construction method for a structure consisting of Re columns and steel beams.

(Prior Art) In order to streamline work when constructing structures, various blefabrication methods are being developed.

Re-column structures are advantageous from the perspective of ensuring the rigidity of the structure and being economical, but considering the need for large-span structures or the economical efficiency of lifting equipment, steel frame structures are used for the beams. In some cases, this is more advantageous, and in fact, composite structures consisting of Re columns and steel beams have been constructed.

(Problems to be Solved by the Invention) In this way, in a composite structure where the columns are made of TiC and the beams are made of steel, there are several problems that need to be solved due to the different characteristics of both structures. When a column passes through a column-beam joint, stress transfer problems occur between adjacent beams or between a beam and a column. Also, when a beam passes through a column-beam joint, the treatment of the column stirrups is difficult. It gets complicated.

The present invention was proposed in view of the above circumstances, and its purpose is to create a pre-assembled cross-shaped structure that saves labor while maintaining continuity between columns and adjacent beams on the upper and lower floors. The point is that it provides the beam construction method.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the pre-assembled cruciform beam construction method according to the present invention comprises a pair of mutually intersecting steel beams each having an opening in the center of the web. Insert the stirrup of the column into the web opening of one steel beam, insert it into the web opening of the other steel beam, temporarily tighten the steel beams to assemble the cruciform beam unit, and assemble the cruciform beam unit. The unit is set on the column head of the Re column on the existing floor, and each of the steel beams is connected to the steel beam of the adjacent cruciform beam unit.

(Function) As described above, the present invention consists of two steel beams each having an opening in the center of the web corresponding to the column-beam joining position, and the opening in the web of one of the steel beams A cross-shaped beam unit with built-in column reinforcements is constructed by inserting the stirrups of the column, inserting the same steel beam into the web opening of the other steel beam, and temporarily tightening the steel beams. By setting the same unit to the column head of the Re column on the existing floor, the flanges of each steel beam will pass through the column-beam joint where the column penetrates, and the tie bars of the Re column will also be placed. By doing so, continuity between columns and adjacent beams on the upper and lower floors is maintained.

(Example) The present invention will be described below with reference to the illustrated embodiments.

(2) and ■ have the configurations h+ and hx (b+< ht), respectively.
With a steel beam in the Y direction on an X direction board formed with an H-shaped cross section,
There is an opening (2) in the center of the web (1) corresponding to the joint.
) is provided.

In addition, when constructed with ready-made H-shaped steel, the opening (2)
It is necessary to cut out the opening (2) and weld the upper and lower flanges (4) of the end plate (3) facing the opening (2), but if the construction is made of built-up H-beam steel, there will be almost no increase in the number of steps. Who?

Also, a plurality of flat bars (5) are welded to the end plate (3) facing the opening (2), or (see Figures 10 and 11) a web (1) is attached to the end plate (3). The web (1) is provided with an uneven portion (6) at its tip;
(See FIGS. 12 and 13) The uneven portion (6) and the flat bar (5) are made to function as a shear connector, so that shear force is sufficiently transmitted between the columns and beams.

As shown in Fig. 4, the column reinforcing bars (■) were constructed in the above-ground temporary assembly yard, and were inserted into the openings (2) of the small steel beams in the X direction. Using the temporary receiving roller 0 [D as a guide, insert it into the opening (2) provided in the web (1) of the steel beam B in the Y direction supported by the support member (9) on the production table until it reaches a predetermined position. After adjusting the dimensions at position 5 on the production table as shown in FIG. 5, the bolts 00 are temporarily tightened to assemble the cross-shaped beam unit.

Note that the hanging tool (8) is removed after supporting the steel beam on the temporary support roller 00.

As shown in Fig. 6, the cross-shaped beam unit is fitted with a formwork surface for the column portion that surrounds the column reinforcement ■, extending over each end plate (3) of both steel beams (B). Good too.

Further, as shown in FIG. 7, a diagonal member a3 may be provided between the steel beams (A) (81) for adjusting the position W or maintaining the position.

) in the figure are temporarily tightened bolts.

The cross-shaped beam unit into which the ties (7) have been inserted as described above is placed on the column head of the cast-in-place or precast RC column (0) on the existing floor, and the column reinforcement (7) is attached to the column main reinforcement 051 that protrudes from the stud head. ) so that they fit together, and connect it to the steel beam of the adjacent cross-shaped beam unit.
A play for adjustment and temporary fixation) OS is installed in advance. In Fig. 1, (X) is the joint of the steel beam, and (Y) is the temporary receiving part.

The illustrated embodiment is applied to a middle column, and 00 in the figure indicates an RC column (O tie reinforcement).

Next, floor plate 0 is installed, and the RC column on the upper floor is connected to the RC column (Q
to complete one cycle of work.

FIG. 14 shows another embodiment of the present invention, in which a steel beam in the X direction and a steel beam in the Y direction (Bj have approximately the same configuration,
At the difference in beam length in the steel beam e in the Y direction, a pair of H
Steel beams made of shaped steel (steel beams are installed opposite each other with a gap between them, and both steel beams (
By connecting the six attachment plates across the outside of the upper and lower flanges (4) of the stem, the cross-shaped beam unit is inserted into the opening (2) provided by inserting the steel beam in the X direction. It is designed to be assembled.

In the figure, parts equivalent to those in the above embodiment are designated by the same reference numerals.

In this case, an attachment plate (I7) is connected between the lower flanges (4) of the pair of H-type steel beam steel frames (a) (a), so that the upper surface is open at the intersection at the steel beam (81). After configuring the opening and setting the steel beam ^ in the opening, the upper flange (4) of both beam steel frames (a) (a)
A cruciform beam unit may be assembled by connecting the outer sides with an attachment plate 07).

(Effects of the Invention) According to the present invention, as described above, among a pair of steel beams having different configurations each having an opening in the center of the web, a column strip is attached to the web opening of one of the steel beams having a smaller configuration. The cross-shaped beam unit, which was assembled by inserting reinforcements and penetrating them into the web openings of the other larger steel beam and temporarily tightening both steel beams, was set on the head of the RC column on the existing floor. By connecting the steel beams of adjacent cruciform beam units, it is possible to save labor while maintaining minimum continuity between the columns on the upper and lower floors and the adjacent beams, and the steel beams can be connected at the column-beam joints. By penetrating the flange, it is possible to sufficiently transmit the moment from the beam to the column-beam joint without complicating the processing of the joint.

In addition, beam members including joints can be transported as wire rods, so
Transportation costs will be reduced.

Furthermore, since the beams are assembled into units on the ground, safety and finishing accuracy are improved.

Furthermore, the number of component units is reduced, which increases the lifting weight.

Labor-saving construction and component joining work will be achieved.

The invention according to claim 2 provides a method for welding a plurality of flat plates to the column-side surface of the end plate located in contact with the opening of the web portion of each steel beam constituting the cross-shaped beam unit, The flat plate functions as a shear connector to ensure the transmission of shear force at the beam-column joint.

The invention according to claim 3 is characterized in that the web of the steel beam in the cross-shaped beam unit is passed through the end plate so as to protrude into an opening provided in the web, and an uneven portion is provided at the tip of the web. This allows the uneven portion to function as a shear connector and ensures the transmission of shear force at the column-beam joint.

The invention according to claim 4 provides a method for simultaneously setting the cross-shaped beam unit in the column head by incorporating a formwork for a column portion surrounding the stirrup into the intersection of the pair of steel beams in the cross-shaped beam unit. This method simplifies construction by assembling formwork for the column-beam joints at the column heads.

The invention as claimed in claim 5 is such that the configurations of the two pairs of intersecting steel beams in the cruciform beam unit are substantially the same, and a pair of beam steel beams are installed opposite each other with an interval at the intersection of the - side steel beams. By connecting the outer sides of the upper and lower flanges of the steel beam with an attachment plate and creating an opening through which the other steel beam can be inserted, the work of creating an opening in the web of the steel beam can be omitted and construction can be simplified. Simplified.

In addition, when the configurations of the twin steel beams are the same like this, it fits better than when the configurations are different.

In the present invention, the configurations of the steel beams in two intersecting directions are almost the same, but the configuration of the steel beam in the penetrating direction is smaller by a few degrees, and when the configurations of both steel beams are exactly the same, the above-mentioned The other steel beam can be inserted with the bolts of the attachment plate connecting the upper flanges of both beams loosened.

The invention as claimed in claim 6 provides that after the other steel beam is set in the opening provided by connecting the lower flanges of the pair of beam steel frames installed oppositely at the intersection of the one steel beam, the other steel beam is connected with an attachment plate. The work efficiency is improved by assembling a cross-shaped beam unit by connecting an attachment plate between the upper flanges of both beam steel frames.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing the implementation status of one embodiment of the construction method of the present invention, Fig. 2 is a vertical sectional view showing details of the structure near the column head,
FIG. 3 is a plan view thereof, FIGS. 4 and 5 are perspective views showing the assembly process of the cross-shaped beam unit, and FIGS. 6 and 7 are perspective views showing each embodiment of the cross-shaped beam unit, respectively. Figures 8 and 9 are front views showing steel beams with different configurations, respectively.
Figures 0 and 11 are front views and plan views showing the main parts of other embodiments of the steel beam, respectively, and Figures 12 and 13 are front views showing the main parts of still other embodiments of the steel beam, respectively. FIG. 14 is a longitudinal cross-sectional view showing the state of implementation of another embodiment of the construction method of the present invention. prisoner・-steel beam, (a・−・steel beam, (O−・・
・RC pillar, (1)・-web, (2)-・
・Opening, (3)・-・End plate, (4
) - flange, (5) - flat bar (6) -・
・Irregularities, (G)--Column reinforcement, 00--Bolts, (+21-- Formwork of column part, a--
Attached plate, (a) - beam iron plaster. Agent: Patent attorney Shigefumi Okamoto and two others Figure 14

Claims (6)

[Claims] (1) Among a pair of steel beams that intersect with each other and each has an opening in the center of the web, insert the column stirrup into the web opening of one steel beam and insert it into the web opening of the other steel beam. The steel beams are inserted and temporarily tightened to assemble a cruciform beam unit, and the cruciform beam unit is set on the column head of the RC column on the existing floor, and each steel beam is connected to the adjacent cruciform beam unit. Pre-assembled cruciform beam construction method characterized by joining with steel beams. (2) A plurality of flat plates are welded to the column-side surface of the end plate located in contact with the web opening of each steel beam constituting the cruciform beam unit. Pre-assembled cross beam construction method. (3) The pre-assembly according to claim 1, wherein the web of each steel beam in the cross-shaped beam unit is made to pass through the end plate so as to protrude into the opening of the web, and an uneven portion is provided at the tip of the web. Cross beam construction method. (4) The pre-assembled cruciform beam construction method according to claim 1, wherein a formwork for a column portion surrounding the stirrup is incorporated at the intersection of a pair of steel beams in the cruciform beam unit. (5) The configuration of the pair of steel beams in the cruciform beam unit is almost the same, and at the intersection of one of the steel beams, a plate is attached between the outer sides of the upper and lower flanges of the pair of steel beams that are placed opposite each other with a gap between them. 2. The pre-assembled cruciform beam construction method according to claim 1, wherein the other steel beam is inserted through the opening provided in the connected manner. (6) The configurations of the pair of steel beams in the cruciform beam unit are almost the same, and a pair of steel beams are installed opposite each other with a gap at the intersection of one of the steel beams, and the lower flange of both steel beams is The pre-assembly according to claim 1, wherein the other steel beam is set in an opening provided by connecting the outer sides with a support plate, and then the upper flanges of the pair of beam steel frames are connected between the outer sides of the upper flanges with a support plate and assembled. Cross beam construction method.