JPS6013110B2 - Column-beam connection method for precast reinforced concrete beams - Google Patents

Description

[Detailed description of the invention] The present invention is a precast reinforced concrete beam column.

This relates to the beam joining method. When constructing the key body of a building, a construction method in which H-beam steel column members are established in advance, a pre-cast concrete beam is joined to this, and then column concrete is poured around the steel column members is widely known. It is widely implemented.

In the above construction methods, precast concrete beams are often constructed as steel-framed concrete structures or steel-framed reinforced concrete structures, but in this case, on-site welding of the steel column and the steel end protruding from the end of the precast concrete beam is performed. Alternatively, bolted joints are disadvantageous in that unless the distance between the steel column member and the end face of the precast concrete beam is made large, there will be operational difficulties and the cost will be relatively high. In addition, in the above construction method, it is known that the precast concrete beam is made of reinforced concrete, and in order to connect the column and beam of this precast reinforced concrete beam, a coupler is placed at the end of the main reinforcing bar of the beam and precast is used. The above precast reinforced concrete beam is erected on the steel column member, and the P for joining passes through the steel column member.
A method is disclosed in which a threaded portion provided at the tip of a C steel bar is screwed into the above-mentioned coupler, and the threaded portion at the other end is bolted to a steel column member. This joining method is ``In order to make a precast concrete beam into a reinforced concrete structure, it is easy and convenient to connect the columns and beams on site. There are some problems with the structural safety of the welding process in which a coupler is attached to the end of the main reinforcing bar of the beam.The present invention is based on the above-mentioned construction method. Column structure and coarse reinforcing bars of precast reinforced concrete beams when constructing a precast reinforced concrete beam.By improving the beam connection, it is possible to improve the workability of beam connection and create a structurally safe column-to-beam joint. The present invention will be described below with reference to the accompanying drawings.

First, the precast reinforced concrete beam 6 used in the column-beam joining method of the present invention is a modified threaded reinforced concrete beam in which a threaded sleeve 2 for connection is screwed onto the end portion, leaving a connecting portion 3, as illustrated in FIGS. 1 and 2. Reinforcement beam main reinforcement beam assembly consisting of reinforcing bars 4
As shown in Fig. 3, the precast reinforced concrete beam 6 is buried in the concrete wing 7, and a temporary steel plate 5 is partially buried in the concrete wing 7 so as to protrude from the end of the beam. Next, at the site, as shown in Figures 4 and 5, the flanges 8 of the column/beam reinforcement points of the H-shaped steel sections 7 of the columns established in advance are joined. A reinforcing bar 10 for joining the threaded joint deformed reinforcing bar is inserted into the through hole 9 provided in the pupil opposite the threaded sleeve 2 at one end of the beam main reinforcing bar of the precast reinforced concrete beam 6 to be Flange 8
The temporary fixing steel plate 5 at the beam end of the precast reinforced concrete beam 6 is superimposed on the temporary fixing gusset plate 5' protruding from the top, and the precast reinforced concrete beam 6 is attached to the H-shaped steel member 7 of the upper girder by tightening bolts 11. Temporarily set at a small interval d, and then, as shown in Fig. 6, the above-mentioned joining reinforcing bar 0 is screwed into the connecting part 3 of the threaded sleeve 2 of the opposing main reinforcing bar end of the precast reinforced concrete beam 6. The fixing nut 2, into which the reinforcing bar 18 is screwed, is tightened and fixed on the inner surface of the flange 8 as described above. right flange 8
, 8, connect the opposing joining reinforcing bars ID to the sleeve joint 1.
3, and then, although not shown in the drawings, column reinforcing bars and hoop bars were constructed around the H-shaped steel members of the column, and column concrete 18 was cast on-site to form the column. This is to integrate and join the beams. Precast reinforced concrete beam column of the present invention.

The beam joining method is carried out as described above, and the H-shaped steel members of the columns that have been established in advance are used. Before temporarily setting the precast reinforced concrete beam 6 by passing it through the hole 9 of the flange 8 of the H-shaped steel member, insert the reinforcing bar 10 for joining, and place the precast reinforced concrete beam 6 into the hole 7 of the H-shaped steel member. After temporarily setting the reinforced concrete beam 6, the above-mentioned joining reinforcing bar 10 is further pulled out from the flange 8, and its tip is inserted into the threaded sleeve 2 of the opposing main reinforcing bar 1 end of the precast reinforced concrete beam 6.
Since the connection is made by screwing into the column concrete beam 18, it is possible to reduce the distance between the shaped steel member 7 and the end face of the precast reinforced concrete beam 6 during work. It becomes possible to set the distance d to 4.0 depending on the designed wall thickness of the outside of the flange 8 of the H-shaped woven member 7.
Hence the pillar. Concrete pouring for beam joints is done using column concrete m.
It can be carried out using only the temporary frame for percussion in Section 18, and has the advantage that a temporary frame for the beam part is not required at the joint at the site.
'o) It is easy to screw the joining reinforcing bars 10 into the threaded sleeves 2 on the end faces of the precast reinforced concrete beams 6 within the above-mentioned small distance d, and it is easy to screw the joining reinforcing bars 10 into the threaded sleeves 2 on the end faces of the precast reinforced concrete beams 6. Since the bolt connection 11 between the member 7 and the temporary gusset plate 5' is a temporary connection, it is easy to work within a small distance d. The joining reinforcing bar 10 is connected to a crimp sleeve joint 13 between the flanges 8 and 8 of the H-section steel member 7 through a threaded sleeve 2.
Since the precast reinforced concrete beams 6 on the left and right sides are connected to the H-section steel member 7 using the reinforcing bars 10 for joining, the fixing work can be done independently on the left and right sides, making the fixing work easy. The main reinforcing bars 1 of the beams are connected through the threaded sleeves 2, so the reliability is higher than that of welding. Fixing nut 12
Since it is tightened and fixed to the inner surface of the flange 8 of the H-shaped steel member 7, loosening occurs at the connection between the beam main reinforcing bar 1 and the joining reinforcing bar 10 and the connection to the H-shaped steel member 7 by the joining reinforcing bar 10. In addition, by connecting the left and right joining reinforcing bars 10 with the crimp sleeve joints 13, it prevents sagging at the column/beam joints of the beam main reinforcing bars 1, which are formed into bars that pass through the column/beam joints. In addition, the fixing nut 12 serves to increase the reliability of the connection joint by the crimp sleeve joint 13, and the crimp sleeve joint 13 is crimped by wide left and right flanges 8, 8.
Actual column-beam joint construction, such as the fact that the work is easy because it is carried out in between, and the work is easy because no welding is used for the column-beam joint at the site, and the reliability of the joint can be obtained. It has many advantages in terms of operation and the structure of the joint. Below, further illustrated embodiments will be described.

As illustrated in the embodiment of the present invention shown in FIGS. 1 to 6, the assembled reinforcing bars 4' of the beam embedded in the concrete 17 of the precast reinforced concrete beam 6, and the beam main reinforcing bars 1 of the spiral jointed deformed reinforcing bars are doubled. It is desirable to have a lattice-like composition with spiral stripes 16 at the corners. The precast reinforced concrete beam in which the reinforcing bars 4 of this beam are buried has a high shear strength and is comparable to a steel reinforced concrete beam. As shown in FIGS. 1 and 2, an anchor nut 14 may be screwed into the front part of a threaded sleeve 2 screwed onto a beam main reinforcing bar 1. This anchor nut 14 serves to prevent the beam main reinforcing bar 1 from buckling due to large tensile stress generated at the beam end. Furthermore, in the column-beam connection, as illustrated in FIG. The fixing nut 15 can also be fixed to the end face of the above-mentioned precast reinforced concrete beam 6 after being screwed into the threaded sleeve 2 of the above. The structure of the fixing nut 15 is useful for preventing the inconvenience that the portion of the joining reinforcing bar 10 screwed into the connecting portion 3 of the threaded sleeve 2 moves due to rotation during work.

[Brief explanation of the drawing]

The attached drawings explain the construction method of the present invention by way of examples. Figure 1 is a side view of the main part of the reinforcing bars of the beam buried as a precast reinforced concrete beam, and Figure 2 is a side view of the main reinforcing bars of the beam in the above figure. A detailed cross-sectional view of the threaded sleeve screwed onto the end, Figure 3 is a perspective view showing the joint end of the precast reinforced concrete beam, and Figure 4 shows the precast reinforced concrete beam spanned and set on the H-shaped steel member of the column. Fig. 5 is a top view corresponding to the previous figure, and Fig. 6 is a side view of the column/beam joint showing the state of the joint. Partial cross-sectional side view, No. 7
This figure is a side view of the main part of FIG. 6 further showing the connection using a fixing nut. 1...Beam main reinforcing bar, 2...Threaded sleeve 3...Connection part, 4.
... Beam assembly reinforcing bars, 5... Temporary fixing steel plates, 5'... Temporary fixing gusset plates, 6... Precast reinforced concrete beams, 7... H-beam steel members, 8... Flanges, 9... Through hole, 10... Reinforcing bar for joining, 11... Bolt tightening, 12.
・Fixing nut, 13...Folding sleeve joint, 14...
・Anchor nut, 15... Fixing nut, 16...
Corner spiral reinforcement, 17...concrete, 18...column concrete. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7

Claims (1)

[Scope of Claims] 1. A beam assembly reinforcing bar 4 composed of a beam main reinforcing bar 1 of threaded joint deformed reinforcing bars with a threaded sleeve 2 for connection screwed to the end, leaving a connecting part 3, is buried, and the beam end A precast reinforced concrete beam 6 formed by partially embedding a temporary fixing steel plate 5 so as to protrude further is added to the above-mentioned precast reinforced concrete beam 6 to which the column of the H-shaped steel member 7 of the previously established column and the flange 8 of the beam node are joined. A reinforcing bar 10 for joining the threaded joint deformed reinforcing bars is inserted into a through hole 9 provided at a position facing the threaded sleeve 2 at the end of the main reinforcing bar 1 of the beam, and then a temporary fixing gusset plate protruding from the flange 8 is inserted. 5, the temporarily fastened steel plates 5 at the beam ends of the precast reinforced concrete beam 6 are overlapped and bolted 11 to form the precast reinforced concrete beam 6.
are temporarily set on the above-mentioned H-shaped steel member 7 at a small interval d, and then the above-mentioned joining reinforcing bars 10 are screwed into the threaded sleeves 2 at the opposite ends of the beam main reinforcing bars 1 of the precast reinforced concrete beam 6, and connected. The joining reinforcing bar 10 is tightened and fixed to the inner surface of the flange 8 with the fixing nut 12 screwed into it, and then, as described above, the joining reinforcing bar 10 is inserted into the left and right flanges 8, 8 of the H-shaped steel member 7, facing each other. A method for joining precast reinforced concrete beams to columns and beams, which is characterized in that after connecting reinforcing bars 10 are connected and connected using crimp sleeve joints 13, column concrete 18 is poured on-site. 2 An anchor nut 1 is attached to the front part of the threaded sleeve 2 screwed onto the end of the beam main reinforcing bar 1 according to claim 1 above.
A column/beam connection method for precast reinforced concrete beams, which is characterized by screwing 4 into place. 3. The fixing nut 15 is screwed into the reinforcing bar 10 for joining according to claim 1 above, and the fixing nut 15 is screwed into the reinforcing bar 10 for joining, and
0 into the threaded sleeve 2 at the end of the beam main reinforcing bar 1 of the precast reinforced concrete beam 6 to connect it, and then fix the fixing nut 1.
5 is tightened and fixed to the end face of the precast reinforced concrete beam 6. 4 The reinforcing bars 4 of the beam according to claim 1 above,
A column-beam connection method for precast reinforced concrete beams characterized by assembling and configuring double square spiral reinforcements 16 in a lattice shape.