JP2004239049A - Precast slab and method for joining the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a precast slab capable of being easily jointed and dismantled and to provide a method for joining the same. <P>SOLUTION: The precast 5 made of a precast slab main body 6 and beams 4 is previously manufactured, and a bearing plate 11 is mounted to a location of a girder 3 to be in contact with the beams 4. The precast slab 5 is mounted to the upper surface of the girder 3 in such a way that webs 4a of the beams 4 provided for the lower surface of the precast slab main body 6 may form the same plane with the bearing plate 11. A gusset plate 10 is arranged in such a way as to extend over the vicinity of end parts of the webs 4a of the beams 4 and the bearing plate 11 of the girder 3. By the fastening of a fastening means 13, the precast slab 5 is joined to the girder 3 constituting the frame of a structure to simultaneously construct the frame provided with the girder 3 and the beam 4 for the structure. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

  The present invention relates to a precast slab and a method for joining the precast slab.

Generally, as a method of constructing a floor slab of a structure using a precast slab, as shown in Patent Literature 1, a stud dowel is arranged in advance on the upper surface of a beam constituting a frame structure of the structure. Generally, a method is used in which a precast slab is rigidly joined to a beam using a stud dowel and integrated.
JP 2001-107498 A

  However, in the above-mentioned configuration, when dismantling a structure that requires renovation, the precast slab is integrated with the beam via the stud dowel, so if you try to remove the precast slab, Easy to damage and deform.

  The present invention has been made in consideration of the conventional problems described above, and has as its object to provide a precast slab and a method for joining the precast slab, which can easily perform joining and disassembly.

  The precast slab according to claim 1, wherein the precast slab is provided on a steel frame structure including a column, a girder made of H-section steel, and a girder, and its outer periphery is substantially coaxial with the web of the girder in the vertical direction. Precast slab body of precast concrete structure whose outer shape is modularized to the size to be located, and the upper flange is fixed at a predetermined position on the back surface of the precast slab body, and a plurality of the said integrally provided in the precast slab body It is characterized by having small beams.

  The precast slab according to claim 2 is characterized in that a head reinforcing bar whose end is enlarged in diameter is used as a floor reinforcing bar constituting the precast slab.

  The precast slab according to claim 3 is characterized in that a width stopper is arranged on an outer peripheral surface of the precast slab.

  The precast slab according to claim 4, wherein the precast slab main body is formed of a half precast concrete structure including a box-shaped box-shaped deck plate having an open upper surface, and concrete cast inside the box-shaped deck plate. A plurality of stud dowels are provided on the upper surface of the upper flange of the beam, and the stud dowels are pierced inward from the back surface of the box-shaped deck plate, and buried in the concrete. It is characterized in that the beam is integrally provided at a predetermined position on the back surface of the precast slab body.

  The precast slab according to claim 5 is characterized in that a hanging jig is provided on a box-shaped deck plate constituting the precast slab main body.

  The method for joining precast slabs according to claim 6 is a method for joining precast slabs in which a precast slab is installed on a steel structure having columns and girders and small beams made of H-section steel. At a predetermined position on the back surface of the precast slab body having an outer shape of a size substantially coaxial in the vertical direction with the web of the girder, a plurality of precast slabs integrally provided with the girder are constructed, and A first step of installing a pressure plate perpendicular to the web at a position where the pressure plate abuts on an end of the beam, and a plurality of precast slabs on an upper flange of the beam; A second step of positioning the web so as to form the same plane and then arranging the web, and straddling both the support plate provided on the large beam and the end of the web of the small beam. As, it is characterized by being constructed by a third step of Tightened through Tightened means both in terms of decor gusset plate.

  In the precast slab joining method according to claim 7, in the first step, the gusset plate is integrally fixed to an end face of a web of a small beam or an end face of a supporting plate of a large beam so as to form the same plane. In the second step, the gusset plate fixed to the end face of the small beam web and the supporting plate of the large beam, or the gusset plate fixed to the end face of the large beam supporting plate and the web of the small beam are abutted face to face. After positioning, a plurality of precast slabs are arranged on the upper flange of the girder, and in the third step, the gusset plate and the girder support plate fixed to the end face of the web of the girder, or the support plate of the girder, The gusset plate fixed to the end face of the support plate and the web of the small beam are fastened by fastening means.

  The method for joining precast slabs according to claim 8 is a method for joining precast slabs, in which a precast slab is installed on a steel structure having columns and large beams and small beams made of H-section steel, wherein the large beams are provided. A first step of arranging a gusset plate so as to straddle both the supporting plate and the end of the web of the beam, and tightening the gusset plate via a fastening means to join the beam to the beam; And, after arranging the box-shaped deck plate constituting the precast slab body at a predetermined position on the upper surface of the beam, a plurality of stud dowels are positioned on the upper surface of the beam, passing through the bottom surface of the box-shaped deck plate. And a third step of placing concrete inside the box-shaped deck plate.

  In the method of joining a precast slab according to claim 9, the gusset plate is integrally fixed in advance to an end face of a web of a small beam or an end face of a support plate of a large beam so as to form the same plane. In the first step, the gusset plate fixed to the end face of the web of the girder and the support plate of the girder, or the gusset plate fixed to the end face of the support plate of the girder and the web of the girder are positioned so as to abut against each other. And then tying through tying means.

  According to the precast slab according to claims 1 and 4, the precast slab composed of the small beam and the precast slab main body is fixed to the large beam constituting the frame of the structure by fastening the small beam and the large beam via the fastening means. The precast slab can be easily dismantled from the structure by joining, removing the binding means and lifting the precast slab with a heavy machine such as a crane, so even when dismantling the structure, construction materials such as columns and girders Since it can be stored in a state that can be reused without being deformed, it can contribute to recycling of construction materials, and can greatly contribute to global environmental conservation.

  Since the outer shape of the precast slab is modularized to a size in which the outer periphery is positioned substantially coaxially with the web of the girder in the vertical direction, the precast slab is modularized for each structure, so that the manufacturing cost is increased. Can be greatly reduced, and work such as carrying in and out and installation can be simplified, so that workability can be improved, and it is possible to greatly contribute to reduction in construction cost and construction period.

  According to the precast slab according to claim 2, since the floor reinforcing steel constituting the precast slab uses a headed reinforcing steel whose end is expanded in diameter, the reinforcing steel with the concrete constituting the precast slab body is used. The fixing effect is high, and it is possible to prevent concrete cracks and destruction that are likely to occur near the outer peripheral edge of the precast slab body.

  According to the precast slab according to claim 3, since a width stopper is arranged on the outer peripheral surface of the precast slab, when the precast slab body is carried into the site, or when installed at a predetermined position, It is possible to prevent chipping of the outer peripheral edge and occurrence of peeling destruction.

  According to the precast slab according to the fifth aspect, since the box-shaped deck plate constituting the precast slab body is provided with the suspending jig, it is easy to lift the precast slab with a heavy machine such as a crane at the time of dismantling. And the dismantling work can be performed efficiently.

  According to the method for joining precast slabs according to claims 6 and 7, since it is not necessary to provide a stud dowel on the upper flange of the girder as in the prior art, there is no need to perform complicated operations such as welding, and studs. Since the cast-in-place operation of the concrete for integrating the dowel and the precast slab is not required, the working efficiency is greatly improved, and it is possible to greatly contribute to the reduction of the construction cost and the construction cost.

According to the method for joining precast slabs according to claims 8 and 9, the precast slab can be easily detached from the structure by the same procedure as that of the conventional method of casting concrete on site and constructing a floor slab. It becomes possible to join precast slabs.
In addition, by arranging floor reinforcement inside the box-shaped deck plate in advance, it is possible to omit the reinforcement work on site, greatly improving work efficiency and greatly shortening the construction period. It is possible to contribute.

(First Embodiment)
1 to 9 show a precast slab and a method of joining the precast slab of the present invention. The present invention, a column and a girder, and a precast slab used for a steel structure composed of small beams, the outer periphery of which is modularized into an outer shape having a size substantially coaxial with the web of the girder in the vertical direction, A small beam constituting the frame of the structure is fixed to a predetermined position on the lower surface in advance. For this reason, the precast slab in which the beam and the precast slab body are integrated can be easily detached from the beam that constitutes the structure by tightening the beam and the beam at the position where the beam and the beam come into contact with each other via the fastening means. Can be joined to

As shown in FIG. 1, a precast slab 5 is installed in parallel with a steel structure 1 including a column 2 made of a steel material and large beams 3 and small beams 4 made of an H-shaped steel.
As shown in FIG. 2A, the precast slab 5 has a configuration in which the precast slab main body 6 is integrated with the small beams 4 constituting the frame of the structure 1 in advance. It is made of a precast concrete structure on a flat plate formed by embedding a plurality of floor reinforcing bars 7 arranged in a lattice shape with concrete 8. As shown in FIG. 1, the precast slab main body 6 has the same area as the area surrounded by the girders 3 of the structure 1, that is, the outer periphery of the precast slab main body 6 has a web of the girders 3. It is modularized to a size that is located substantially coaxially with the vertical direction 3a.

  In such a precast slab main body 6, a plurality of small beams 4 constituting the frame of the structure 1 are arranged on the back surface thereof in parallel with a side in the X direction of the precast slab main body 6 and at a predetermined separation distance. . As shown in FIG. 2 (b), the beam 4 is made of H-shaped steel, and its member length has the same length as the side of the precast slab body 6 in the X direction. A stud dowel 4c is provided, and a through hole 4d is provided near the end of the web 4a, as shown in FIG. The small beams 4 are integrated by embedding the upper flange 4b and the stat dowel 4c at predetermined positions on the back surface of the precast slab main body 6 to constitute the precast slab 5. Therefore, the structure 1 has a structure including the girders 3 and the small girders 4 by installing the precast slab 5 on the girders 3.

In the present embodiment, the plurality of floor reinforcing bars 7 constituting the precast slab main body 6 use head reinforcing bars whose ends are enlarged in diameter. However, the present invention is not necessarily limited to this. Any floor rebar 7 may be used as long as it has a configuration that has a high fixing effect with the floor 8.
In addition, when the precast slab body 6 is carried into the site or when the precast slab body 6 is installed at a predetermined position, the outer peripheral surface of the precast slab body 6 is provided for the purpose of preventing chipping of the outer peripheral edge and occurrence of peeling destruction. Although the width stopper 9 generally used for the precast member is provided, it is not always necessary to provide the same.

A method of joining the precast slab 5 having the above-described configuration to the structure 1 will be described below.
In a first step, a floor steel bar 7 arranged in a lattice shape is placed on a mold (not shown) formed to a predetermined size in a factory or a site of a site, and concrete 8 is cast. As shown in FIGS. 2A and 2B, a plurality of precast slabs 5 each having a desired size and composed of the precast slab main body 6 and the small beam 4 are manufactured. At this time, the size of the formwork is preliminarily formed to be substantially the same size as a rectangular area in a plan view surrounded by the web of the girders 3 constituting the structure 1, and the small size is formed on the bottom surface. An opening is provided at the position where the beam 4 is arranged, the upper flange of the small beam 4 is fitted into the opening, and the stud dowel 4c is directed inward of the mold.
On the other hand, as shown in FIG. 1, a support plate 11 that is orthogonal to the web of the girder 3 and connects the upper and lower flanges is attached to the girder 3 at a position where the girder 3 abuts on the end of the girder 4. The support plate 11 is provided with a through hole 11a.

  In the second step, as shown in FIG. 3, the web 4a of the small beam 4 provided on the lower surface of the precast slab main body 6 and the upper surface of the large beam 3 are formed so that the support plate 11 forms the same plane. Install the precast slab 5.

  In the third step, as shown in FIG. 3, the gusset plate 10 is disposed so as to straddle both the vicinity of the end of the web 4 a of the small beam 4 and the support plate 11 of the large beam 3. The holes and the through-holes 4d and 11a provided in each of the web 4a of the small beam 4 and the supporting plate 11 of the large beam 3 are aligned so as to be coaxial, and a high force is applied to penetrate both. Tightening means 13 consisting of bolts is arranged and tightened.

  Thereby, the precast slab 5 is joined to the girder 3 constituting the frame of the structure 1, and at the same time, a frame including the girder 3 and the small beam 4 is formed in the structure 1. With such a configuration, the inertial force generated in the precast slab 5 is transmitted to the large beam 3 via the small beam 4 and the fastening means 13.

The method of joining the small beam 4 and the large beam 3 is not limited to the above-described method. The following shows other cases.
In the first step, as shown in FIG. 4, when the support plate 11 is attached to the girder 3, a support plate 11b to which the gusset plate 10 is integrally attached is attached instead.
In the second step, as shown in FIG. 5, the web 4a of the small beam 4 provided on the lower surface of the precast slab main body 6 and the gusset plate 10 are brought into contact with each other, and Install the precast slab 5.
In the third step, the through-hole 4d provided near the end of the web 4a of the small beam 4 and the through-hole of the gusset plate 10 are aligned so that they are coaxial, and both are aligned. The precast slab 5 is installed on the structure 1 by arranging and tying the tying means 13 so as to penetrate.

  The gusset plate 10 does not necessarily need to be provided on the support plate 11b attached to the girder 3. The support plate 11 without the gusset plate 10 is attached to the girder 3, and the web 4a of the small beam 4 The gusset plate 10 may be integrally fixed so as to protrude outward and form the same plane. In this manner, any structure can be used as long as both the large beam 3 and the small beam 4 can be tightly connected. A configuration using means may be used.

  Further, the first production of the precast slab 5 having the small beams 4 on the lower surface of the precast slab main body 6 can be performed in the same manner as the conventional method of constructing a floor slab by cast-in-place concrete. . However, in this case, for the purpose of facilitating removal during disassembly, a configuration in which adjacent precast slabs 5 are connected to each other with a girder therebetween is not used. In order to insulate between the precast slabs 5 adjacent to each other with the girder therebetween, the space is formed as shown in FIG. 3, and a partition plate 12 is provided in the space.

  According to the configuration described above, the precast slab 5 is configured by integrally providing the plurality of small beams 4 on the back surface of the precast slab main body 6, so that the small beams 4 and the large beams 3 are joined together. The precast slab 5 can be joined to the girder 3 constituting the structure 1 by fastening through the joint 13, and a stud dowel 4 c is provided on the upper surface of the girder 3 as in the related art, and is integrally formed with the stud dowel 4 c. There is no need to provide the precast slab body 6. Further, the precast slab 5 in which the precast slab body 6 and the small beam 4 are integrated with each other can be easily disassembled from the structure 1 by removing the binding means 13 and lifting the precast slab 5 with a heavy machine such as a crane. Also, when the structure 1 is dismantled, the construction materials such as the pillars 2 and the girders 3 can be stored in a state that can be reused without deforming, so that the construction materials can be recycled and the global environment can be protected. Can greatly contribute to

  Since the outer shape of the precast slab 5 is modularized to a size in which the outer periphery is positioned substantially coaxially with the web of the girder 3 in the vertical direction, the precast slab 5 is modularized for each structure. Therefore, it is possible to greatly reduce the production cost, and also to simplify the work such as carrying in and out and installing, so that the workability can be improved, which can greatly contribute to the reduction of the construction cost and the construction period. Become.

  The floor reinforcing bar 7 provided in the precast slab body 6 uses a headed reinforcing bar having an enlarged diameter at the end, so that the precast slab has a high effect of fixing with the concrete constituting the precast slab body 6 and has a high effect. It is possible to prevent concrete cracks and breakage that are likely to occur near the outer peripheral edge of the main body 6.

  The outer peripheral surface of the precast slab main body 6 is provided with a width stopper, so that when the precast slab main body 6 is carried into a site or installed at a predetermined position, chipping of the outer peripheral edge or peeling failure occurs. It is possible to prevent occurrence.

  The method of joining the precast slab 5 to the structure 1 is as follows: a precast slab 5 modularized to a desired size composed of the precast slab main body 6 and the small beam 4 is constructed in advance; A support plate 11 that is perpendicular to the web and connects the upper and lower flanges is attached to a position where the support beam 11 abuts on the end of the beam 4. The precast slab 5 is joined to the structure 1 by arranging the gusset plate 10 so as to straddle both of the pressure plates 11 and joining them through the fastening means 13. Since there is no need to provide stud dowels, there is no need to perform complicated work such as welding, and the stud dowel and precast slab 5 are integrated. Since the cast-in-place work over preparative becomes unnecessary, it is possible to work efficiency is greatly improved, it becomes possible to greatly contribute to the construction cost reduction and construction costs reduced.

(Second embodiment)
Incidentally, the precast slab body 6 constituting the precast slab 5 is not necessarily limited to the above-described precast concrete structure, but may be a half-precast concrete structure having a composite structure.
The precast slab 5 using the half precast concrete precast slab body 6 and the joining method thereof will be described below.

  The precast slab main body 6 includes a box-shaped deck plate 14 and concrete 8 as shown in FIG. The box-shaped deck plate 14 has a steel deck plate 14a as a bottom surface, and a steel partition plate 14b is arranged upright on each of four sides of the steel deck plate 14a, so that the upper surface is opened. Is molded. The shape in plan view is the same as the area surrounded by the girders 3 of the structure 1, that is, the size in which the outer periphery of the box-shaped deck plate 14 is substantially coaxial with the web 3 a of the girders 3 in the vertical direction. It is modularized.

The floor reinforcing bar 7 is disposed at a predetermined height inside the box-shaped deck plate 14, and is formed on the upper surface of the box-shaped deck plate 14 above the floor reinforcing bar 7. The mesh wire net 15 is uniformly arranged so as to cover the formed opening.
The box-shaped deck plate 14 having such a structure functions as a concrete formwork, and concrete 8 is cast inward so as to bury the floor reinforcing bar 7 and the mesh wire mesh 15, thereby forming a precast slab. The main body 6 is configured.

  The configuration in which the mesh wire mesh 15 is arranged inside the box-shaped deck plate 14 and above the floor reinforcing bar 7 is used for the purpose of preventing concrete cracks that easily occur on the upper surface of the precast slab body 6. . As shown in FIG. 7 (a), a hanging jig 16 made of a metal fitting having a through hole such as a long nut is provided inside the box-shaped deck plate 14, and is provided with a heavy machine such as a crane. When the precast slab body 6 is lifted, the lifting work of the precast slab body 6 can be easily performed by using the suspending jig 16.

These precast slab bodies 6 are the same as in the first embodiment, and as shown in FIG. 7A, the small beams 4 constituting the frame of the structure 1 are fixed to the back surface to form the precast slab 5. I do. The small beam 4 has the same configuration as that shown in the first embodiment. The upper flange 4b is provided with a plurality of stud dowels 4c and the vicinity of the end of the web 4a. Is provided with a through hole 4d.
Here, a plurality of holes 14aa through which the stud dowels 4c pass are provided at positions where the small beams 4 of the steel deck plate 14a constituting the bottom surface of the box-shaped deck plate 14 are arranged. Therefore, the stud dowel 4c is cast inside the box-shaped deck plate 14 after the stud dove 4c is layered through the hole 14aa from the back surface side of the steel deck plate 14a. The small beam 4 is fixed to the back surface of the precast slab main body 6.

The precast slab 5 of the half precast concrete structure having the above-described configuration has the same procedure as the conventional construction in which the floor slab is constructed by casting the concrete 8 constituting the precast slab body 6 on site, The precast slab 5 can be joined to the girder 3 constituting the frame of the structure 1.
Hereinafter, a method of joining the precast slab 5 to the structure 1 will be described in detail.

  In the first step, as shown in FIG. 8, the small beam 4 is fastened to the large beam 3 via fastening means 13 composed of a gusset plate 10 and high strength bolts. Here, the method of binding the small beam 4 and the large beam 3 is the same as the second step and the third step in the method of joining the precast slab 5 described in detail in the first embodiment with reference to FIG. Method may be used. At this time, a support plate 11 that is orthogonal to the web of the girder 3 and connects the upper and lower flanges is attached to the girder 3 at a position where the girder 3 abuts on the end of the girder 4.

The method of joining the small beam 4 and the large beam 3 is not limited to the above-described method.
Similar to FIGS. 4 and 5 described above, as shown in FIG. 7B, when the support plate 11 is attached to the girder 3, instead of the support plate 11b, the gusset plate 10 is integrally attached. The web 4a of the beam 4 and the gusset plate 10 are arranged so as to be in contact with each other, and a through hole 4d provided near the end of the web 4a of the beam 4 and the gusset After aligning the through-hole of the plate 10 so that it is coaxial, the fastening means 13 may be arranged so as to penetrate through the two.

  The gusset plate 10 does not necessarily need to be provided on the support plate 11b attached to the girder 3. The support plate 11 without the gusset plate 10 is attached to the girder 3, and the web 4a of the small beam 4 The gusset plate 10 may be integrally fixed so as to protrude outward and form the same plane. In this manner, any structure can be used as long as both the large beam 3 and the small beam 4 can be tightly connected. A configuration using means may be used.

In the second step, as shown in FIG. 9A, a box-shaped deck plate 14 constituting the precast slab main body 6 is arranged at a predetermined position on the upper surfaces of the small beams 4 and the large beams 3, and The floor reinforcing bar 7, the mesh wire mesh 15, and the hanging jig 16 are arranged inside the shaped deck plate 14.
Next, the stud dowel 4c is inserted into the hole 14aa of the steel deck plate 14a from inside the deck plate 14, and one end of the stud dowel 4c is fixed to the upper flange 4b of the small beam 4 via fixing means. . At this time, the floor reinforcing bar 7, the mesh wire mesh 15, and the hanging jig 16 fix the stud dowel 4c to the upper flange 4b of the small beam 4 from inside the box-shaped deck plate 14, and then move the box-shaped deck plate 14 May be arranged inside.

  In the third step, as shown in FIG. 9B, the stud dowel 4c, the floor reinforcing bar 7, the mesh wire mesh 15, and the hanging jig 16 are embedded inside the box-shaped deck plate 14. Concrete 8 is poured. As a result, the precast slab body 6 is constructed, and the small beams 4 fastened to the large beams 3 are fixed to the back surface of the precast slab body 6, and the precast slab 5 is joined to the structure 1. It becomes.

  As shown in FIG. 7 (b), the precast slab 5 described above is disposed with a predetermined amount of gap between adjacent precast slab bodies 6 for the purpose of facilitating removal work during disassembly. Is what you do.

  According to the above-described configuration, although the precast slab 5 has the precast slab main body 6 integrated with the small beam 4, the small beam 4 and the large beam 3 are fastened via the fastening device 13, so that the By removing the precast slab body 6 with a heavy machine such as a crane, the precast slab body 6 can be easily dismantled from the structure 1 together with the small beams 4 as the precast slab 5, so that when the structure 1 is dismantled, The construction materials such as the pillars 2 and the girders 3 can be stored in a state that can be reused without deforming them, which can contribute to recycling of construction materials and greatly contribute to global environmental conservation. Become.

  Further, since the hanging jig 16 is provided on the box-shaped deck plate 14 constituting the precast slab body 6, the operation of lifting the precast slab 5 with a heavy machine such as a crane at the time of disassembly can be easily performed. Work can be performed efficiently.

Furthermore, the precast slab 5 can be joined to the structure so that the precast slab 5 can be easily detached from the structure while the concrete 8 is cast on site and the floor slab is constructed. It becomes possible.
In addition, by arranging the floor reinforcement 7 inside the box-shaped deck plate 14 in advance, the work of arranging the reinforcement on site can be omitted, so that the work efficiency is greatly improved and the construction period is shortened. Can be greatly contributed to.

It is a figure showing the joining structure to the structure of the precast slab concerning the present invention. It is a figure showing the details of the precast slab concerning the present invention. It is a figure showing the joined part to the structure of the precast slab concerning the present invention. It is a figure showing other examples of a joining structure of a precast slab to a structure concerning the present invention. It is a figure showing other examples of a joined part to a structure of a precast slab concerning the present invention. It is a figure showing other examples of a precast slab concerning the present invention. It is a figure which shows the junction part to the structure of the other example of the precast slab which concerns on this invention. It is a figure showing the joining method (the 1) to the structure of other examples of the precast slab concerning the present invention. It is a figure showing the joining method (the 2) to the structure of other examples of the precast slab concerning the present invention.

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 1 Structure 2 Column 3 Large beam 4 Small beam 4a Web 4b Upper flange 4c Stud dowel 4d Through hole 5 Precast slab 6 Precast slab main body 7 Floor reinforcement 8 Concrete 9 Width stopper 10 Gusset plate 11 Support plate 11a Through hole 11b Support plate 12 Partition plate 13 Tightening means 14 Box-shaped deck plate 14 a Steel deck plate 14 b Stripped steel plate 15 Mesh wire mesh 16 Hanging jig

Claims (9)

A precast slab provided on a column and a steel structure including large beams and small beams made of an H-shaped steel,
Precast concrete precast slab body whose outer shape is modularized in outer shape to a size that is located substantially coaxially in the vertical direction with the web of the girders,
A precast slab comprising a plurality of the small beams integrally embedded in the precast slab body, the upper flange being embedded at a predetermined position on the back surface of the precast slab body. In the precast slab according to claim 1,
A precast slab characterized in that a head reinforcing bar whose end is enlarged in diameter is used as a floor reinforcing bar constituting the precast slab. In the precast slab according to claim 1 or 2,
A precast slab, wherein a width stopper is disposed on an outer peripheral surface of the precast slab. In the precast slab according to claim 1,
The precast slab main body is composed of a box-shaped box-shaped deck plate having an open upper surface, and a half-precast concrete structure including concrete cast into the inside of the box-shaped deck plate. On the upper surface of the flange, there are multiple stud dowels,
The stud dowel is penetrated inward from the back side of the box-shaped deck plate, buried in the concrete, and a small beam is integrally provided at a predetermined position on the back side of the precast slab body. Slab. In the precast slab according to claim 4,
A precast slab, wherein a hanging jig is provided on a box-shaped deck plate constituting the precast slab body. A method of joining a precast slab, in which a precast slab is installed on a steel structure including columns and large beams and small beams made of H-shaped steel,
In advance, a plurality of precast slabs in which the small beams are integrally provided are constructed at predetermined positions on the back surface of the precast slab body having an outer shape whose outer periphery is positioned substantially coaxially with the web of the girders in the vertical direction. With
A first step of installing a support plate orthogonal to the web at a position in contact with the end of the small beam in the web of the girder;
A second step of arranging a plurality of precast slabs on the upper flange of the girder after positioning them so that the support plate of the girder and the web of the girder form the same plane;
A third step of arranging a gusset plate so as to straddle both the support plate provided on the girder and the end of the web of the girder, and then tying them together through tying means. A unique method of joining precast slabs. The method for joining precast slabs according to claim 6,
In a first step, the gusset plate is integrally fixed to an end face of a web of a small beam or an end face of a support plate of a large beam so as to form the same plane;
In the second step, the gusset plate fixed to the end face of the small beam web and the support plate of the large beam, or the gusset plate fixed to the end face of the large beam support plate and the web of the small beam are abutted face to face. After positioning, place a plurality of precast slabs on the upper flange of the girder,
In the third step, the gusset plate fixed to the end face of the web of the beam and the supporting plate of the girder, or the gusset plate fixed to the end face of the supporting plate of the girder and the web of the beam are tied through the tying means. A method of joining precast slabs. A method of joining a precast slab, in which a precast slab is installed on a steel structure including columns and large beams and small beams made of H-shaped steel,
A gusset plate is disposed so as to straddle both the support plate provided on the girder and the end of the web of the girder, and then the two are tightened via a tightening means to join the girder to the girder. Process and
After arranging a box-shaped deck plate constituting the precast slab body at a predetermined position on the upper surface of the girder and the small beam, a plurality of the plurality of beams are positioned on the upper surface of the small beam so as to penetrate the bottom surface of the box-shaped deck plate. A second step of fixing the stud dowel via the fixing means;
A method for joining precast slabs, wherein the method is constructed by a third step of casting concrete inside the box-shaped deck plate. The method for joining precast slabs according to claim 8,
In advance, the gusset plate is integrally fixed to the end face of the web of the small beam or the end face of the support plate of the large beam so as to form the same plane,
In the first step, the gusset plate fixed to the end face of the web of the girder and the support plate of the girder, or the gusset plate fixed to the end face of the support plate of the girder and the web of the girder are brought into face-to-face contact. A method for joining precast slabs, wherein the joining is performed via a fastening means after positioning is performed.

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