JP2842199B2 - Floor method using precast reinforced concrete girders and steel beams - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a floor construction method for reducing the weight of a reinforced concrete building and simplifying the construction by using a buried formwork as a floor formwork.

[0002]

2. Description of the Related Art In the construction of a reinforced concrete building, a so-called precast reinforced concrete construction method in which precast reinforced concrete members are used for members such as columns, beams, walls, floors and the like and these members are assembled on site is simplified in construction. In recent years, it has become more and more popular in terms of production, shortening of construction period, and reduction of construction cost. When a precast reinforced concrete member is used as a beam member in this precast reinforced concrete method, the precast reinforced concrete member is used for both the large beam and the small beam.

[0003]

When a precast reinforced concrete member is used as a small beam, both ends of the precast reinforced concrete member need to extend through the large beam while being connected to a precast reinforced concrete member which is a large beam. In other words, it is necessary to connect the large beams and the small beams so as to ensure sufficient integration with the large beams while connecting the small beams having a large own weight so as not to impair the continuity. For this reason,
The connection between the girder and the girder has become larger and more complex. For this reason, the load on the girder is increased, and the girder is forced to be larger, and thus the columns and foundations are also required to be larger.

[0004]

SUMMARY OF THE INVENTION The present invention reduces the weight of small beams by using H-beams instead of precast reinforced concrete members as small beams, and embeds steel plates for connecting small beams in precast reinforced concrete members which are large beams. By doing so, the connection between the girder and the girder is simplified, and the load on the girder is reduced. As a result, it is possible to reduce the size of the girder, and eventually to reduce the size of the pillar and the foundation, thereby reducing the construction cost.

That is, the present invention embeds a steel plate having a plurality of plate-like pieces mounted on both sides and a plurality of connecting bolt holes formed on both left and right ends in such a manner that both right and left ends project from the member in a direction orthogonal to the longitudinal direction. The precast reinforced concrete beam member is used as a large beam, and an H-section steel having a plurality of connecting bolt holes at both ends of the web between the large beams is connected to the large beam through a connecting bolt hole as a small beam, and the floor is buried on the beam. Lay the formwork,
After arranging the top beam reinforcement and slab reinforcement, it is a method of floor construction consisting of placing slab concrete.
In the present invention, the use of precast reinforced concrete members for the girders and the use of H-beams for the small beams eliminate the necessity of constructing a formwork for the beam members. Nevertheless, constructing a formwork for a floor member goes against purposes such as simplification of construction and reduction of construction costs, so in the present invention, a buried formwork is used for a floor member. And no diversion formwork. As such a buried formwork, an ordinary steel plate with a built-in reinforcing steel or a steel plate-discarded formwork is used. Precast reinforced concrete slabs are also used as buried formwork,
From the viewpoint of reducing the weight of the slab after casting the slab concrete, it is preferable to use an ordinary steel plate with a built-in reinforcing steel or a steel plate discarded formwork.

[0006] Since the H-shaped steel used as a small beam is exposed on the surface even after construction, it is necessary to cover the surface with a refractory material after construction when constructing a refractory building (most are the same). . After construction, a method of spraying a refractory material on an exposed surface or attaching a refractory material forming plate is not preferable because a scaffold is assembled on a lower floor. In advance,
Except for the joints on the exposed surface of the H-shaped steel, it is covered with a refractory molded plate. For covering the joints, a refractory molded plate is separately slidably mounted on the outer periphery of the refractory molded plate. After being attached to the girder, it is preferable to slide the refractory material forming plate of the connection portion and fix it to the girder so as to cover the connection portion.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

FIGS. 1A and 1B show an example of a steel plate with a plate-like piece embedded in a precast reinforced concrete member used as a girder in the present invention, wherein FIG. 1A is an elevation view, and FIG. 1B is an AA of FIG. It is sectional drawing.

A total of eight L-shaped steel pieces 7 are fixed to both sides of a steel plate 6 having an opening 10 at the center by bolts 8. A total of eight connecting bolt holes 9 are drilled in the left and right end portions of the steel plate 6 on one side. This plate-shaped piece of steel plate 5
L-shaped billets 7 are all buried, and right and left connection bolt holes 9
Is buried in the precast reinforced concrete member so as to protrude outward. The number of L-shaped slabs 7 fixed to the plate-shaped steel plate 5 and the number of connecting bolt holes 9 to be drilled are appropriately increased or decreased depending on the size of the precast reinforced concrete girders 2 and the size and length of the H-beams 3 as small beams. Is done. Precast reinforced concrete girders 2 at the center of steel plate 6
Although the opening 10 is provided to maintain the continuity of the concrete in the longitudinal direction, since the continuity of the concrete in the longitudinal direction is temporarily maintained by the concrete above and below the steel plate 6, the opening 10 need not be provided forcibly. Is also good.

FIGS. 2A and 2B show the arrangement and connection of large beams and small beams at the time of construction according to the present invention. FIG. 2A is a plan view, and FIG.

Referring to FIG. 2, the connection of the girder and the girder and the construction procedure of the present invention will be described.

(1) The precast reinforced concrete girders 2 are bridged between the columns 1.

(2) The precast reinforced concrete girder 2 has a steel plate 5 with a plate-like piece embedded at an intermediate portion thereof, and its left and right ends protrude outward, and a connection bolt hole 9 is drilled at the protruding portion. On the other hand, the webs at both ends of the H-shaped steel 3 as the small beams are similarly formed with connection bolt holes at positions corresponding to the connection bolt holes 9. The H-shaped steel 3 is bridged between the precast reinforced concrete girders 2 by overlapping the two connecting bolt holes and connecting the bolts.

(3) The buried floor form 4 is laid on the beam,
The girders 12 and the slab bars are arranged.

(4) Placing the slab concrete 13.

Thus, the floor is completed.

FIG. 2 shows an example in which one H-beam 3 as a small beam is bridged between the large beams 2. However, depending on the structure, a plurality of H-beams 3 may be provided between the large beams 2. In this case, a precast reinforced concrete member in which a plurality of plate-shaped steel plates 5 are buried is used as the girder 2 for connecting the H-beam 3 as a small beam.

FIG. 3 shows an example in which the exposed surface of the H-shaped steel 3 is covered with a refractory material forming plate as a small beam, (a) is a longitudinal sectional view of a connecting portion with a large beam, (b) (A) is a view as viewed from an arrow A, and (c) is a view as viewed from an arrow B in (a).

A piece of wood 18 for locking the refractory molded plate 14 is continuously or intermittently adhered to the inner surface of the flange of the H-section steel 3, and the refractory molded plate 14 is nailed or screwed to the wood piece 18 from three sides. The cross section is trapezoidal and covers most of the exposed surface of the H-section steel 3. The L-shaped steel piece 17 is welded to the H-shaped steel 3 so as to cover the end face of the refractory material forming plate 14 on the joint side, and serves as a guide plate when the sliding refractory material forming plate 15 described later slides. The sliding refractory molded plate 15 is a refractory molded plate for covering the exposed surface of the joint after connecting the H-section steel 3 to the girder 2, and is slidably fitted around the outer periphery of the refractory molded plate 14. Have been. After connecting the H-section steel 3 to the girder 2, the sliding refractory material forming plate 15 is slid to the girder 2 side to fix the end face to the girder 2 by bonding or the like, and the end of the refractory material forming plate 14 side is formed of refractory material. It is fixed to the plate 14 with nails or screws.

In FIG. 3A, the sliding refractory material forming plate 15 shows the position before sliding, and the sliding refractory material forming plate 16 shows the position after sliding.

[0021]

According to the present invention, the weight of the girder becomes lighter and the connection between the girder and the girder is simplified, so that the load on the girder can be reduced, and the girder can be reduced in size. The size can be reduced, and the construction cost can be reduced.

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an example of a plate-shaped pieced steel plate embedded in a precast reinforced concrete member used as a girder in the present invention, (a) is an elevation view, (b) is an A- of (a).
It is A sectional drawing.

FIGS. 2A and 2B show the arrangement and connection of girders and small beams at the time of construction according to the present invention, wherein FIG. 2A is a plan view and FIG.

FIG. 3 shows an example in which an exposed surface of an H-shaped steel is covered with a refractory molded plate as a small beam, where (a) is a longitudinal sectional view of a connection portion with a large beam, and (b) is (a). ) In the direction of arrow A,
(C) is an arrow B view of (a).

[Explanation of symbols]

1. Pillars 2. Precast reinforced concrete girders,
3 ··· H-shaped steel (beam), 4 · · · buried floor formwork, 5 · · · steel plate with plate-like piece, 6 · · · steel plate, 7 · · · L-shaped steel piece, 8 · · bolt, 9 · · · bolt holes for connection , Opening, 11 ... stirrup bar, 12 ... upper beam top bar, 13 ... slab concrete, 14 ... refractory molded plate, 15, 16 ... sliding refractory molded plate, 17 ... sliding Dynamic fire resistant material guide plate, 1
8. A piece of wood for locking a refractory molded plate.

Claims (2)

(57) [Claims] 1. A precast reinforced concrete beam in which a plurality of plate-like pieces are mounted on both sides, and a steel plate having a plurality of connecting bolt holes formed on both left and right ends is buried such that both right and left ends protrude from members in a direction orthogonal to the longitudinal direction. The member is a girder, and an H-shaped steel in which a plurality of connection bolt holes are perforated at both ends of the web between the girder is connected as a small beam to the girder through the connection bolt hole, and an embedded floor form is laid on the beam. Flooring method, after arranging the top beam reinforcement and slab reinforcement, and then placing slab concrete. 2. An H-shaped steel in which three peripheral surfaces except an upper surface except for both ends of the H-shaped steel are covered with a refractory material, and both ends are provided with a sliding refractory material slidable along the outer periphery of the refractory material. The floor construction method according to claim 1, wherein the floor is used as a small beam.