JPH0932171A - Joining part structure of precast floor plate and construction method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply join the ends of precast floor plates arranged on steel frame beams in a specified strength to place construction materials. SOLUTION: At least one hole 12 is formed in a cotter 11 arranged on steel frame beams so as to engage with protrusions 11a and recessions 11b of the ends of adjacent precast floor plates constituted thereof. A stud bolt 16 is inserted in the hole 12 and welded with the steel frame beam. Shrinkage- compensating mortar is placed in the clearances 17 between the stud bolt and adjacent precast floor plates 10 and in the hole 12. Spiral rods 13 arranged around the holes 12 and slab reinforcements 14 having U-shaped reinforcing parts 14a arranged around the holes 12 are arranged in the inside of the precast floor plate 10 and reinforcements are arranged at the U-shaped reinforcing parts 14a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a precast floor board joint structure and a method of constructing the same, and more particularly to a joint structure of precast floor boards which are arranged opposite to each other on a steel beam in a steel frame building and a method of constructing the joint structure. Regarding

[0002]

2. Description of the Related Art Conventionally, a method of constructing a slab, that is, a floor, in a steel frame building is constructed by laying a deck plate after the steel frame is built, and laying a wire mesh or a reinforcing bar on the deck plate and placing concrete. Was common.

[0003]

However, in the conventional method for constructing a slab as described above, it is impossible to practically place materials and the like until the concrete is laid and placed on the deck plate. It was necessary to provide a temporary gantry to put work materials separately. In addition, the lifting of materials is complicated during finishing work and equipment work after floor construction, and it is necessary to add lifting equipment to solve this, which causes a delay in construction period and an increase in construction costs. Was there.

The object of the present invention is to solve the above-mentioned conventional problems, and when a slab of a steel frame building is constructed using a precast floor board formed in advance in a factory or the like, it is arranged on a steel beam. It is an object of the present invention to provide a precast floor board joint structure and a method for constructing the precast floor board, which allows the end portions of the precast floor board to be easily joined to each other with a predetermined strength so that materials and the like can be placed.

[0005]

The present invention relates to a precast floor board joint structure and a method for constructing the same, which is configured as follows to solve the above-mentioned technical problems. That is, the precast floorboard joint structure of the present invention is composed of a convex portion and a concave portion formed at an end portion of the precast floorboard, and a steel beam so that the convex portion and the concave portion of the adjacent precast floorboard end portion are engaged with each other. A cotter portion installed side by side on top of the cotter portion, at least one hole for insertion of the gibel muscle formed in the cotter portion, and a gibel muscle fixed to the steel beam arranged in the hole provided in the cotter portion And a non-shrinkage mortar cast in the gap between the cotter portions of the adjacent precast floorboards and in the hole of the cotter portion in which the gibber streak is placed (claim) (Corresponding to item 1).

Further, in the precast floor board joining structure of the present invention, the reinforcing structure inside the precast floor board is arranged in a spiral shape around the hole and a U-shape arranged around the hole. It is also preferable that at least a slab reinforcement having a reinforcing bar portion is provided, and the reinforcing bar is arranged in the U-shaped reinforcing bar portion of the slab reinforcement (claim 2).
Corresponding to).

Further, the present invention is a method for constructing a precast floor board joint structure, which is configured as follows in order to solve the above-mentioned technical problems. That is, the method for constructing a precast floorboard joint structure according to the present invention comprises a plurality of precast floorboards each having a cotter portion having a hole for insertion of at least one perforation on each side and a convex portion and a concave portion of the cotter portion. Are installed on the steel beam so that they mesh with each other, and at that time, the gibber streak pre-fixed on the steel beam corresponding to the position of the hole provided in the precast floor board is relatively inserted into each hole. Alternatively, after each precast floor board is installed side by side on the steel beam, each of the holes of the cotter section is provided with a Gibel streak and fixedly erected on the steel beam, and the cotter section of the adjacent precast floor board is installed. A non-shrink mortar is placed in the hole of the cotter part in which the gap part and the gibber streak are inserted, whereby the precast floor plate and the steel beam are integrated. And characterized in that (corresponding to claim 3).

The precast floor board joint structure of the present invention can also be constructed by the following method. The construction method is as follows: Precast floorboards with at least one hole for insertion of the dowel muscle on each side and precast floorboards with at least one hole for insertion of the dober muscle on each of the four sides. Then, prepare a plurality of precast floor boards with girders in which beamlets are pre-attached so that a pair of opposing cotter parts ride on the beam, and a plurality of precast floorboards with girders can be attached to beamlets. The cotters on both ends which are not mounted are placed on a girder and installed at every other precast floorboard placement planned position to connect the girder and the girder, and then the girder between the precast floorboards with girders With the large beam and the small beam so that the precast floor plate without sticking is positioned so that each cotter part meshes with the cotter part of the adjacent precast floor plate. Is installed on the precast beam, and at that time, the gibber pre-fixed on the girder corresponding to the position of the hole provided in the cotter portion of the precast floorboard is relatively inserted into each hole? Or, after the precast floor boards are installed side by side on the girder, each hole of the cotter portion is provided with a Gibel streak and fixed to the girder to stand upright, and then a gap between the cotter portions of the adjacent precast floor boards. The non-shrink mortar is cast in the hole of the cotter portion that is on the bridge portion and the girder, thereby integrating the precast floorboard and the steel beam (corresponding to claim 4).

Furthermore, in the method for constructing the precast floor plate joint structure described above, when the precast floor plate with beam is prepared in advance, the gibber streak fixed to the beam is attached to the cotter portion mounted on the beam. Located in the hole,
The beam can be integrated by driving non-shrink mortar into the hole in which the gibber streak is arranged (corresponding to claim 5).

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The precast floor board joint portion structure and its construction method of the present invention will be described below in more detail with reference to the embodiments shown in the drawings. The precast floorboard joint structure according to this embodiment uses a unique precast floorboard (hereinafter simply referred to as floorboard) 10. This floorboard is a panel mass-produced in factories, etc., and is generally a reinforced concrete panel. It is called a precast floorboard when it is designed to be used as a building floor.

The floor board 10 has cotter portions 11 formed on four sides. The cotter portion 11 is a portion in which convex portions 11a and concave portions 11b are alternately formed as shown in FIG. Each convex portion 11 in this cotter portion 11
At least one hole 12 penetrating the front and back of the floor plate 10 is formed in a.

The hole 12 is for inserting a gibber line using a stud bolt or the like, and therefore has a diameter larger than that of the gibbel line. As a reinforcing structure inside the floor plate 10, a slab having reinforcing bars 13 spirally arranged around the hole 12 and a U-shaped reinforcing bar portion 14a arranged so as to surround the hole 12. At least the muscle 14 is provided. The above-mentioned reinforcing bar 13 is arranged on the U-shaped reinforcing bar portion 14a of the slab bar 14.

Such a precast floorboard 10 is formed by using a mold as is conventionally done. At that time, the hole 12 for the insertion of the gibber muscle provided in the convex portion 11a of the cotter portion 11 is formed by arranging a cylindrical mold between the surface molds facing each other, and the reinforcing muscle 13 is formed in the cylindrical mold. It is reinforced by placing it around the frame. Of course, in this case, the cylindrical formwork for forming the holes 12 is removed from the completed precast floorboard 10 together with the other formwork.

However, the hole 12 for inserting the gibber muscle and the reinforcing muscle 13 around it can also be formed by the following method. That is, as shown in FIG. 3, a thin iron plate is formed into a cylindrical shape, and a formwork / reinforcing plate 19 for a perforation of a dowel insertion
The spiral reinforcing bar 13 is wound around the outer periphery of the reinforcing member 13 so that each part is fixed to the extent that it does not separate.

A formwork / reinforcement plate 19 having such reinforcing bars 13 is arranged at a predetermined position between the surface molds for the precast floorboard. Then, for example, concrete is filled in the space surrounded by these surface formwork and other side formwork. At this time, needless to say, necessary rebars such as slabs are naturally provided in the space.

After that, when the concrete is hardened, the surface form and the side form are removed. However, the formwork / reinforcement plate 1 used to form the hole 12 for inserting the dowel
9 is buried as it is. When the precast floorboard 10 is formed in this manner, the reinforcement bar 13 and the installation of the form for forming the gibber insertion hole and the subsequent treatment are very simple, and the efficiency of manufacturing the precast floorboard is improved.

The precast floorboard joint structure formed using such a precast floorboard 10 is as follows. That is, this precast floorboard joint structure is
Concave portion 11a and concave portion 11b formed at the end portion of the precast floorboard 10, and concave portion 11b and convex portion 11a formed at the opposite end portions of the adjacent precast floorboards.
It includes a cotter portion 11 installed side by side on a steel frame beam 15 composed of a large beam 15a and a small beam 15b so as to mesh with.

As described above, at least one hole 12 for inserting the gibber muscle is formed in each convex portion 11a of the cotter portion 11. A gibber streak 16 is inserted into the hole 12 provided in each convex portion 11 a of the cotter portion 11 and fixed to the steel beam 15. And the gap part 1 between the cotter parts 11 of the adjacent precast floor boards 10
Hole 12 in the cotter part 11 in which 7 and the dovetail muscle 16 are put
A non-shrink mortar 18 is placed therein.

As a method for constructing this precast floorboard joint structure, first, a plurality of precast floorboards 10 are used.
Is installed on the steel beam 15 so that the convex portion 11a and the concave portion 11b of the cotter portion 11 mesh with each other. After that, the gibber streak 16 is inserted from the hole 12 provided in the convex portion 11a of the cotter portion 10 of each precast floorboard 10 and fixed to the steel beam 15 to stand upright.

Then, a non-shrinkable mortar 18 is cast into the hole 12 of the cotter portion 11 in which the gap 17 and the gibber streak 16 of the cotter portion 11 of the adjacent precast floorboard 10 are inserted. As a result, the end portions of the precast floor board 10 placed on the steel beam 15 so as to face each other are joined together and, at the same time, integrated with the steel beam 15.

In the above-described embodiment, the precast floor boards 10 are arranged on the steel beam tops 15 and then the gibber reinforcement 16 is provided.
The steel beam 15 into the hole 12 formed in the cotter portion 11.
However, it is also possible to fix the gibber streak 16 on the steel beam 15 at a predetermined position in advance. In this case, the "predetermined position" is the position on the steel beam 15 where the holes 12 of the cotter portion 11 are located by design when the precast floorboards 10 are arranged on the steel beam 15.

Further, the precast floor board joint structure according to the present invention can be constructed by the following method.
That is, in another construction method of the precast floor board joint structure, first, the precast floor board 10 described above and the precast floor board 20 with beam girders in which the beam 15b is attached in advance to this precast floor board as shown in FIG. It is manufactured and prepared in advance at the factory.

Precast floor board 20 with such a beam
Is manufactured as follows. That is, the beam is arranged along the cotter portions 11 on the two sides of the precast floor board 10 that face each other. At that time, in correspondence with the position of the hole 12 provided in the precast floor board 10, the gibber streak 16 fixed in advance on the beam 15b is inserted relatively into each hole 12, or The gibber streak 16 is positioned in each hole 12 of the cotter portion 11 by inserting it from each hole 12 of the cotter and fixing it to the beam 15b.

After that, non-shrink mortar is placed in each hole 12 of the cotter portion 11 in which the gibber streak 16 fixed to the beam is placed, whereby the precast floor board 10 and the beam 15b are integrated. To be Precast floorboard 10 and precast floorboard 2 with crossbeams manufactured in this way
0 is transported from the factory to the construction site, and as shown in FIG. 4, first, the precast floor board 20 with a beam is placed on the girder 15a with the cotter portions on both ends where the beam is not attached and the continuous precast. Install every other one at the planned floorboard location.

Then, the small beam 15b and the large beam 15a are welded or connected to each other by using a high tension bolt or the like by a well-known means, and then the precast floor plate 10 without the beam is positioned between the precast floor plates 20 with the small beam. Each cotter section 11
Is installed on the large beam 15a and the small beam 15b of the precast 20 with the small beam so that the cotter portions 11 of the adjacent precast floor plates are engaged with each other.

At this time, the gibber streak 16 is pre-fixed on the girder 15a corresponding to the position of the hole 12 provided in the cotter portion 11 of the precast floor board 10 and the precast floor board 20 with a small beam, and the cotter portion 11 of Insert into each hole 12 relative to each other, or each precast floorboard 1
After installing 0 and 20 on the girder 15a, the cotter part 11
Girber 16 is inserted from each hole 12 of
The gibber streak 16 fixed to the girder 15a is arranged in each hole 12 of the cotter portion 11 by any method of fixing to the a.

Thereafter, non-shrinkage mortar is placed in the gaps between the cotter portions of the adjacent precast floorboards and in the holes 12 of the cotter portion 11 on the girder 15a. In this way, the precast floorboard is placed on the steel beam and integrated.

[0028]

EXAMPLES As a concrete example of the precast floorboard joint structure according to the present invention, the precast floorboard 10 having the cotter portions 11 formed on four sides can be made of reinforced concrete. At that time, two dowel insertion holes 12 provided in the cotter portion 11 are formed in each of the convex portions 11a.

The protrusion length of the protrusion 11a in the cotter portion 11 of the precast floor board 10 having a thickness of 150 mm which is usually used is about 200 mm. And the cotter part 1
The hole 12 formed in No. 1 has a trapezoidal cross section in which the upper opening diameter is slightly larger than the lower opening diameter. Of course, this hole 12
Needless to say, the shape of the above may be a cylindrical shape in which the upper opening diameter and the lower opening diameter are substantially the same.

The dimension of concrete covering from the upper and lower ends of the reinforcing bar 13 arranged so as to surround the hole 12 to the surface of the precast floorboard is about 10.
It becomes about mm.

It is very preferable that the reinforcing bar 13 is a spirally formed one because it is easily available and inexpensive. However, a large number of rings are stacked at intervals and connected by thin bar bars. It may be something like this.

The stud bolt, which is most applicable as the gibber streak 16, is fixed to the large beam 15a or the small beam 15b by means such as welding. Then, as a method of forming a hole for inserting a gibber streak in the cotter convex portion of the precast floor plate, a cylindrical form frame / reinforcing plate 19 made of a thin iron plate and a spiral reinforcing bar to be arranged around its outer periphery are introduced. It is also fixed by welding.

[0033]

As described above, according to the structure of the precast floor board joint portion of the present invention, the steel beam is used so that the projections and the recesses of the cotter portion formed at the end are engaged with the cotter portions of the adjacent precast floor boards. The bellows are arrayed and supported on the top, and the gibber streak is placed in the hole provided in the cotter part and is fixed to the steel beam. By arranging, it is possible to obtain a strong joint between the ends of the precast floor board and the steel beam.

As a result, construction materials and the like can be temporarily placed on this floor in a steel building at any time, in other words, a floor that can be used as a material stockyard can be formed at an early stage. Since the lifting weight can be reduced by the preceding lifting and the lifting equipment can be minimized, and there is no need to install a temporary gantry for placing work materials as in the past, the cost of this temporary gantry is It will be very economical without cost.

Further, according to the method of constructing the precast floor board joint structure according to the present invention, a very strong slab or floor having the precast floor board joint structure as described above in a steel frame building can be used in an extremely short period of time and efficiently. Can be built in the same way.

Further, according to the precast floor board joint structure of the present invention, since the floor construction can be completed in a steel frame building at an early stage, it becomes a roof and the work thereafter is not affected by the weather, and the passage is early. Further, since the work space is secured, the work environment is improved, and it is possible to smoothly shift to the finishing work after the steel frame is built, which is a great effect.

[Brief description of drawings]

FIG. 1 is a plan view showing a joint portion in a precast floor board joint portion structure according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a precast floor board joint section taken along line 2-2 in FIG.

FIG. 3 is a perspective view showing a cylindrical formwork / reinforcement plate made of a thin iron plate used in a method of forming a hole for inserting a dowel reinforcement on a convex part of a cotter part of a precast floor plate and a reinforcement bar attached to the outer periphery thereof. is there.

FIG. 4 is an explanatory view showing a method for constructing a precast floor board joint structure according to another embodiment of the present invention.

FIG. 5 is a structural explanatory view schematically showing a precast floorboard with crossbeams used in a precast floorboard joint structure according to another embodiment of the present invention.

[Explanation of symbols]

 10 Precast Floor Board 11 Cotter Part 11a Convex Part 11b Recess 12 Hole for Gibel Reinforcement 13 Reinforcing Bar 14 Slab Reinforcement 14a U-Shaped Reinforcing Bar 15 Steel Beam 15a Large Beam 15b Small Beam 16 Gibel Rein 17 Gap 18 Non-shrink Mortar 19 Gibel Rein Formwork and reinforcing plate for forming insertion holes 20 Precast floorboard with beam

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Satoshi Tsuda 2-10-10 Fujimi, Chiyoda-ku, Tokyo Maeda Construction Industry Co., Ltd.

Claims (5)

[Claims] 1. A cotter which is composed of a convex portion and a concave portion formed at an end portion of a precast floor plate and which are arranged side by side on a steel beam so that the convex portion and the concave portion of the end portion of the adjacent precast floor plate mesh with each other. Portion, a hole for inserting at least one gibber muscle formed in the cotter portion, a gibber muscle fixed to the steel beam arranged in the hole provided in the cotter portion, and the adjacent precast floorboard A non-shrink mortar that is cast in the gap between the cotter parts and in the hole of the cotter part in which the gibber streak is inserted. 2. A rebar structure inside the precast floorboard has at least a spiral reinforcing bar arranged around the hole and a slab bar having a U-shaped rebar part arranged so as to surround the hole. The precast floorboard joint structure according to claim 1, wherein the reinforcing bar is arranged in a U-shaped reinforcing bar portion of the slab reinforcement. 3. A plurality of precast floor boards each having at least one cotter portion having a hole for insertion of a dowel muscle formed on each of four sides are installed on a steel beam so that the convex portion and the concave portion of the cotter portion mesh with each other. , At that time, corresponding to the position of the hole provided in the precast floor plate, the gibber pre-fixed on the steel beam is relatively inserted into each hole, or each precast floor plate is placed on the steel beam After being installed side by side, each of the holes of the cotter part is inserted into the gibber streak and fixedly erected on the steel beam, and the gap part and the gibber streak of the cotter part of the adjacent precast floorboard are inserted. A method for constructing a precast floorboard joint structure in which a non-shrink mortar is cast in the hole of the cotter portion, thereby integrating the precast floorboard and the steel beam. . 4. A precast floorboard in which at least one cotter portion for perforating the perforations is formed on each of four sides, and at least one cotter portion for perforating each perforation is formed on each of the four sides. Then, prepare a plurality of precast floor boards with girders in which beamlets are pre-attached so that a pair of opposing cotter parts ride on the beam, and a plurality of precast floorboards with girders can be attached to beamlets. The cotters on both ends which are not mounted are placed on a girder and installed at every other precast floorboard placement planned position to connect the girder and the girder, and then the girder between the precast floorboards with girders Positioning the precast floor board without a sticker so that each cotter portion engages with the cotter portion of the adjacent precast floor board so that the girders and the girders are attached. Is it installed on the beam of the recast, at that time, corresponding to the position of the hole provided in the cotter portion of the precast floor board, is the gibber pre-fixed on the girder inserted relative to each of the holes? Or, after the precast floor boards are installed side by side on the girder, each hole of the cotter portion is provided with a Gibel streak and fixed to the girder to stand upright, and then a gap between the cotter portions of the adjacent precast floor boards. A method for constructing a precast floor board joint structure in which non-shrink mortar is cast in the holes of the cotter portion on the bridge and the girder, thereby integrating the precast floor board and the steel beam. 5. When the precast floorboard with girders is prepared in advance, the gibber reinforcement fixed to the girders is located in the hole of the cotter portion placed on the girders, and the gibber reinforcements are arranged. The method for constructing a precast floor board joint structure according to claim 4, wherein the beam is integrated by casting non-shrink mortar in the hole.