JPH0420639A - Pc small beam - Google Patents

Abstract

PURPOSE:To shorten the period of production as well as reduce the cost of construction by a method in which a coupler to be connected with large beams with small beams having axial steel bars and given steel bars and anchor bars to be buried from the coupler into the small beam of PC are provided in end portion. CONSTITUTION:A small PC beam 20 is made up of a concrete body 30 and axial steel bars 23 and web bars 25. The beam 20 is placed between large beams 10 to make up of the frame structure of floor, and couplers 21 and anchor bars 22 to be fixed to them are provided on both ends. In the couplers 21, the burying part 21c of other flange 21b is buried in the hardened body 30 in such a way as to turn the in-situ concrete face 21d of the flange 21a in an L-shaped form upwards. The U-shaped (plan view) anchor bar 22 is welded to the burying face 21c of the other flange 21b at the bottom 22a by matching the axial direction of the branched part 22b with the axial direction of the beam 20 in the hardened body 30. The welding period of beams can thus be shortened and the labor therefor can also be reduced.

Description

Detailed Description of the Invention "Industrial Field of Application" The present invention has a hardened concrete body, axial reinforcing bars buried in the longitudinal direction of the hardened concrete body, required belly reinforcing bars, etc. The present invention relates to PC (“precast”; the same shall apply hereinafter) small beams that are constructed between the concrete beam and the large beam to constitute a frame structure of the floor on which a floor slab can be installed.

[Conventional techniques for floor construction include flat slab structures in which the floor slabs are directly supported by columns with column capitals without using beams;
There is a structural type in which beams are erected between columns to create the main structural frame, and a floor is built between the beams. The latter is called the Ohashi style and is practiced many times. And in recent years,
In this girder type, the small beams are precast (PC) (hereinafter the same shall apply) for reasons such as labor saving and shortening the construction period.

) is often done.

When adopting the girder type as the structural type, a girder is constructed by installing a beam between the columns, that is, a girder is constructed by installing a girder between the columns.
It is necessary to construct the main structural frame structure by joining the large beams and the PC beams constructed between the large beams.

Conventionally, the connection between the large beam and the PC beam has been made by connecting a large plate 3 to the end face of the PC beam 2, as shown in FIGS. 4(A) and 4(B). This is done by tightening bolts to the gazette plate 4 provided on the side of the PC board, and when performing such joining work, the PC beam is supported by a support.

"Problems to be Solved by the Invention" However, since conventional joining was performed as described above, there were the following problems.

In other words, it took a considerable amount of time and effort to install supports for the PC beams, and it was difficult to bolt the brace plates installed on the end faces of the PC beams and the gazette plates installed on the sides of the main beams on site. It is necessary to provide a cutout for the PC.
The shape of the small beam was complicated.

As a result, problems such as a complicated formwork structure and chipping of PC beams occurred during formwork removal, transportation, and on-site installation.

In addition, although steel beams are often used as girders, there is a problem in that the steel beams have to be fitted with gazette plates at a steel frame fabrication factory, which requires a considerable amount of time, labor, and steel materials. .

Furthermore, when pouring on-site concrete, a formwork is required to cover the notch in the PC beam, which poses the problem of requiring a considerable amount of time and labor.

The present invention has been made in view of these problems,
The purpose of this is to eliminate the need for supports to support the PC beams, simplify the formwork structure compared to conventional technology, and reduce the need for formwork removal, transportation, and on-site installation.
PC beams reduce chipping of C beams, shorten the time, labor and material costs required for manufacturing beams in steel frame fabrication factories, and reduce time and labor required for manufacturing PC beams. The point is to provide the following.

"Means for Solving the Problems" The gist of the present invention is to have a hardened concrete body, axial reinforcing bars buried in the longitudinal direction of the hardened concrete body, required belly reinforcing bars, etc., and a girder and a girder. PC that constitutes the frame structure of the floor on which the floor slab can be installed by constructing it between
The small beam has a hanging member that is hung on the large beam that constitutes the frame structure, and an anchor bar that is embedded in the PC beam that protrudes from the hanging member, at the end thereof. The PC beam is characterized by the following features:

"Function" Since the hanging member can be hung on the H steel that constitutes the main beam, there is no need for a support to support the PC beam when installing the PC beam.

In addition, after the PC beam is erected, the large beam and the PC beam can be joined by pouring concrete on site, so the notches for bolt tightening work provided in the PC beam and the gusset plate provided in the large beam can be used. , eliminating the need for reinforcing materials.

In addition, since the PC beam does not require the above-mentioned notch, there is no need for a formwork to prevent the above-mentioned notch from being cold when pouring concrete on-site.

"Example" Hereinafter, an example of the present invention will be described in detail with reference to the drawings. However, the numerical values, dimensions, materials, shapes, and relative positions of the component parts described in this example are not specifically described, and the scope of the present invention is not limited to those only. It's not a real thing, it's just an illustrative example.

First, the configuration of the PC beam according to this embodiment will be explained using FIG. 1. FIG. 1 is a side view of the PC beam, and FIG. 2 is a side view of the hanging member.

As shown in FIG. 1, the PC beam 20 includes a hardened concrete body 30, axial reinforcing bars 23 buried in the longitudinal direction of the hardened concrete body 30, and stirrups 25.
(abdominal reinforcing bars), which constitutes a floor frame structure on which a floor slab can be installed by constructing it between the girders 10 and 10.
The small beam 2o includes a hanging member 21 and the hanging member 21.
Anchor bars 22 are fixedly attached to both ends thereof.

As shown in FIGS. 1 and 2, the hooking member 21 is
It has an angular shape in its longitudinal section, and the embedding surface 21c of the other flange 21b is buried in the hardened concrete body 30 so that the cast-in-place concrete casting surface 21d of the minus flange 21a faces upward. . More specifically, the other flange 21b is attached to the concrete so that the girder contact surface 211 and the end surface 20C of the PC beam 20 are flush with each other, and the buried surface 21C on the - flange 21a side protrudes slightly. It is embedded in the hardened body 30. This protrusion length may be determined by taking into consideration the effective height of the PC beam 20, the thickness of the slab 50, etc. Said - flange 21
The width B of a is such a length that, when temporarily installed between the girders 10 and 10, the hooking surface edge 21e can be hooked onto the upper surface of the H steel 11 that constitutes the girder 10.

The anchor reinforcing bars 22 are reinforcing bars having an abbreviated shape in plan view,
The bottom part 22a is fixed by explosively contacting the buried surface 21c of the other flange 21b so that the axial direction of the branch part 22b coincides with the axial direction of the PC beam 20, and is buried in the concrete hardened body 30. That's what happens.

Further, in this embodiment, the PC beam 20 is provided with a coupling 24 so as to protrude perpendicularly from the lower end of the end surface 20C.

Next, a method of joining the PC beam 20 and the main beam 10 configured as described above will be explained in FIGS. 3(a) and 3(a).
(b) will be used to explain. Figure 3 (a) is a plan view showing the connection state between the PC beam 20 and the main beam 10, and Figure 3 (b) is the P
FIG. 3 is a side view showing a state in which the C small beam 20 and the main beam 10 are joined.

First, as shown in Fig. 3 (a) and Fig. 3 (b), a P
The C small beam 20 is made up of the Hl that constitutes the large beam 10.
liill, the hooking surface edge 2 of the - flange 21a.
The rack is passed so that 1e is hung thereon, and then fixed with temporary fixing bolts 60.

Next, by assembling a formwork for the girder 10 and pouring cast-in-place concrete 40 into the formwork, the PC beam 20 and the girder 10. ．． 10 can be joined, and the slab 50 can be constructed.

Next, the effects of the joining structure of the PC beams 20 configured as described above will be explained.

Since the hanging member 21 can be hung on the 1-fill that constitutes the large beam 10, the PC small beam 20 can be attached to the large beam 10.10 without requiring a support to support the PC small beam 20. It is possible to construct a bridge in between.

Furthermore, according to the PC beam 20, there is no need for a notch for tightening bolts to the PC beam 20, so the structure of the formwork for molding the PC beam 20 is simplified compared to the conventional technology. , the above P during formwork removal, transportation, and on-site installation.
It is possible to reduce chipping of the C beam 20.

Furthermore, since there is no need to attach a gazette plate, reinforcing material, etc. to the girder 10, the time required for manufacturing the girder 1o at a steel frame manufacturing factory can be shortened, and the labor and material costs can be reduced compared to conventional techniques. It's coming.

Furthermore, the installation of the PC beam 20 is simply carried out using the Hw411.
This can be done by hanging the front girder latching member 21 on the front girder, and does not require bolt tightening, so it takes less time to join the main beam 1o and the PC small beam 20 on site compared to the conventional technology. It is possible to shorten the time and reduce labor.

Further, since the PC beam 20 does not have a notch for tightening bolts, it is not necessary to temporarily install a formwork on the PC beam 20 to prevent the notch from being cold when pouring concrete 40 on site. . As a result, the P
Required for the work of joining the C small beam 20 and the large beam 10110,
It can save time and reduce labor.

Furthermore, since the PC beam 2o is provided with a connection 24, the connection with the cast-in-place concrete 40 can be made stronger.

In this embodiment, the hooking member 21 having a shape as shown in FIG. 2 is used, but this is not intended to limit the scope of the present invention. The shape may be suitable for carrying out the present invention, such as an L shape.

Further, although the cylinder 24 is provided at the lower part of the end surface 20c of the PC beam 20, it is not intended to limit the scope of the present invention thereto, and in the present invention, it is provided at a suitable position for carrying out the present invention. I can do it.

In addition, in the present invention, as shown in FIG. 3()X),
The moving joint 24 may not be provided. In such a case, the shearing force is transmitted by the anchoring effect of the concrete portion where the concrete is swallowed by the girder 10. For example, in FIG. 3()\), a temporary fixing bolt 60 is used as a method of fixing the hooking member 21 to the upper surface of the H steel 11, but this is not intended to limit the scope of the present invention, and the present invention Other methods suitable for carrying out the present invention may be used, such as welding.

Further, although the number of the anchor bars 22 is two,
This is not intended to limit the scope of the present invention, and the present invention may have any suitable number for carrying out the present invention.

[Effects of the Invention] Since the present invention is configured as described above, it produces the following effects.

According to the present invention, since the hanging member can be hung on the H [that constitutes the large beam, the PC beam can be erected without requiring a support to support the PC beam.

In addition, since there is no need for a notch in the PC beam for bolt tightening work, the structure of the formwork for forming the PC beam is simplified compared to conventional technology, making it easier to remove the formwork, transport it, and install it on site. It is possible to reduce chipping of PC beams.

Furthermore, since there is no need to attach gusset plates, reinforcing materials, etc. to the girder, the time required for manufacturing the girder at a steel frame manufacturing factory can be shortened, and the labor and material costs can be reduced compared to the conventional technology.

Also, since the PC beam does not have a notch for bolt tightening,
There is no need for formwork to keep the notches cold when pouring concrete on-site, and as a result, compared to conventional technology, the time and labor required for joining the PC beams and the main beams can be reduced. .

As a result, according to the present invention, the construction cost required for constructing a floor using the girder type can be reduced compared to the prior art.

[Brief explanation of the drawing]

Figures 1 to 3 (B) show one embodiment of the present invention, with Figure 1 being a side view of the PC beam, Figure 2 being a side view of the latching member, and Figure 3 being the side view of the PC beam. ) is a plan view showing the connection state between the PC beam and the main beam, FIG. 3(B) is a side view showing the connection state between the PC beam and the main beam, and FIG. A side view showing an example, and FIGS. 4(A) and 4(B) are perspective views showing a conventional method of joining a main beam and a PC small beam. 10...Liar, 11...HM, 2O-
-PC beam, 20c...end face, 21...
Hanging member, flange of 21a...-, 21b...
...Other 7 lunges, 21c...Buried surface, 21d
...Cast-in-place concrete pouring surface, 21e...
・Latching surface edge, 21f...Girder contact surface, 22・
- Anchor reinforcement, 22a...-bottom, hardened body, O...cast-in-place concrete, slab.

Claims (1)

[Claims] A floor that has a hardened concrete body, axial reinforcing bars buried in the longitudinal direction of the hardened concrete body, and required abdominal reinforcing bars, etc., and can be installed with a slab by being constructed between the girders. PC beams constituting a frame structure, and a hanging member that is hooked to a girder constituting the frame structure;
A PC beam is characterized in that an anchor bar is provided at an end portion of the PC beam, protruding from the hanging member and buried within the PC beam.