JP2019190175A - Precast composite slab, joint method of precast composite slab and beam member, and joint structure - Google Patents

Abstract

To provide a precast composite slab, a joint method of the precast composite slab and a beam member, and a joint structure excellent in workability and economic efficiency, which realize a bolt joint without performing a site welding work and a post-cast concrete work, when jointing the precast composite slab to the beam member.SOLUTION: A fixing plate 3 is provided with a bolt hole 3a to be jointed on a beam member 5 at lower surfaces of both end parts of a deck plate 2 for a synthetic slab in a longitudinal direction arranged with a composite mechanism such as embossment and key groove on a corrugated steel plate configured to alternatively link trough crest parts 20 and trough parts 21 through inclined parts 22, and concrete 4 is cast on the deck plate 2. The fixing plate 3 is provided on the lower surfaces of both end parts of the deck plate 2 in the longitudinal direction using heat-drawing plugging means or shear connector joint means. The bolt hole 3a of the fixing plate 3 is positioned at a lower part of the crest part 20 of the deck plate 2.SELECTED DRAWING: Figure 1

Description

  The present invention belongs to the technical field of precast synthetic slabs, and more specifically, a deck plate for synthetic slabs that has been subjected to a synthetic mechanism such as embossing and keyway on a corrugated steel sheet that has been conventionally used for placing concrete at a construction site. The present invention relates to a precast synthetic slab realized by using a slab, a method of joining a precast synthetic slab and a beam, and a joint structure.

  The deck plate for synthetic slabs, which is a corrugated steel plate used mainly in steel construction with a composite mechanism such as embossing and keyway, the deck plate plays the role of formwork, and after the concrete hardens, it also plays the role of tensile reinforcement In recent years, demand has continued to grow, such as occupying a share of about 60% of the deck plate, because there are many merits such as the rational construction that can be achieved and the weight reduction of the slab.

On the other hand, precast slabs currently in practical use are ALC panels (lightweight cellular concrete) and reinforced concrete plates, and there are no examples of precast synthetic slabs realized using the deck plate for synthetic slabs. At most, a technique of constructing a half-type precast synthetic slab using the synthetic slab deck plate as described in Patent Document 1 and placing concrete on site is disclosed.
Incidentally, the half-type precast synthetic slab according to Patent Document 1 is, as shown in FIGS. 1 and 2 of the same document 1, both ends in the longitudinal direction and both ends in the width direction of the precast synthetic slab body (11). Are provided with joint notches (14a, 14b) in which the surface of the deck plate (12) is exposed in advance, so that joining work (laying work) between slabs at the site, slab and beam (4) Ingenuity to perform the joining work of.

JP 7-207794 A

The precast synthetic slab according to Patent Document 1 has to be manufactured with a joint cutout (14a) for joining with a beam. Moreover, when joining with a beam (4), it was necessary to introduce | transduce welding means, such as welding a stud (5) using the space which the said notch part (14a) for joining forms. Furthermore, it was necessary to perform post-cast concrete on the joint notch (14a).
That is, according to the precast synthetic slab according to Patent Document 1, in addition to manufacturing problems associated with the formation of the joining notch (14a), welding work and post-cast concrete work are indispensable on site. There is a problem in work (construction), and this is a problem to be solved.

  Incidentally, when the floor slab is constructed using the ALC panel (lightweight cellular concrete), the above-mentioned problem does not occur. However, since the ALC panel itself cannot bear horizontal rigidity (especially in-plane shear force such as earthquake), it is necessary to stretch a horizontal brace (for example, angle brace) between the beams, which is not economical. In addition, it has been pointed out that it is an obstacle to field work such as equipment piping.

  However, in a place where a dry construction method such as a precast slab or an ALC panel is adopted, such as in an apartment house, it is hateful to use fire such as welding, and mechanical joints such as bolts and screws are often used.

  The present invention has been devised in view of the problems of the background art described above, and its purpose is to perform welding work on site and post-working concrete work when joining with a beam material, An object of the present invention is to provide a precast synthetic slab that is excellent in workability and economy by realizing bolted joint, and a joining method and a joining structure between the precast synthetic slab and a beam material.

  As a means for solving the above-mentioned problems, the precast synthetic slab according to the invention described in claim 1 is provided with a synthetic mechanism such as an emboss or a keyway on a corrugated steel sheet in which crests and troughs are alternately connected via inclined parts. A fixed plate having a bolt hole for joining to a beam material is provided on the lower surface of both end portions in the longitudinal direction of the applied composite slab deck plate, and concrete is cast on the deck plate. And

  A second aspect of the present invention is the precast synthetic slab according to the first aspect, wherein the fixing plate is provided on the lower surface of both end portions in the longitudinal direction of the deck plate by means of a temper plug welding means or a shear connector joining means. It is characterized by being.

  According to a third aspect of the present invention, in the precast synthetic slab according to the first or second aspect, the bolt hole of the fixing plate is provided at a portion located below the peak portion of the deck plate. And

  The method for joining the precast composite slab and the beam material according to the invention described in claim 4 is characterized in that the fixing plate of the precast composite slab according to any one of claims 1 to 3 is installed on an upper surface of the beam material, The precast synthetic slab and the beam member are bolted using a bolt hole of a fixing plate.

  The method for joining the precast composite slab and the beam material according to the invention described in claim 5 is characterized in that the fixing plate of the precast composite slab according to any one of claims 1 to 3 is connected to the beam material via a beam receiving metal. The precast synthetic slab and the beam member are joined by installing and bolting the precast synthetic slab and the beam receiver using the bolt holes of the fixed plate.

  The joint structure of the precast synthetic slab and the beam material according to the invention described in claim 6 is such that the fixing plate of the precast synthetic slab according to any one of claims 1 to 3 is installed on an upper surface of the beam material, The precast synthetic slab and the beam material are bolted together using a bolt hole of a fixing plate.

  The joining structure of the precast synthetic slab and the beam material according to the invention described in claim 7 is such that the fixing plate of the precast synthetic slab according to any one of claims 1 to 3 is connected to the beam material via a beam receiving metal. The precast synthetic slab and the beam member are joined by bolting the precast synthetic slab and the beam receiving metal using a bolt hole of the fixed plate.

According to the precast synthetic slab and the joining method and the joining structure of the precast synthetic slab and the beam material according to the present invention, the following effects can be obtained.
(1) The joint between the precast composite slab and the beam material can be realized by bolt joint using the bolt hole of the fixing plate of the precast composite slab, and welding work and post-cast concrete work are unnecessary. Further, the joining work can be performed mechanically, and a skilled worker required for the welding work or the like is not required. Therefore, it is very excellent in workability and economy.
(2) Since the bolt joining operation can be performed by effectively utilizing the space formed below the peak portion of the synthetic slab deck plate, it is possible to realize a very reasonable joining operation with good fit.
(3) When the precast composite slab (the deck plate) and the fixing plate are joined by the stopper plug welding means or the shear connector joining means (including the stud welding means), the fixing plate and the beam member are joined by bolts. Thus, it is possible to realize a structure that reliably transmits an in-plane shearing force such as an earthquake generated (input) to the precast composite slab to the beam member. Therefore, a load in the horizontal direction can be applied to the precast synthetic slab, and a structure that ensures sufficient horizontal rigidity can be realized without providing a horizontal brace. In particular, when the shear connector joining means is used (see FIG. 6), a metal rod-like member such as a stud (headed stud in the illustrated example) or a reinforcing bar is used for increasing the adhesion strength with concrete. This contributes to the realization of precast synthetic slabs with superior strength and rigidity.
(4) Since the precast synthetic slab is heavier than the ALC panel, the sound insulation is inevitably improved and the comfort is improved. It also has excellent fire resistance.
(5) As shown in FIGS. 4 and 5, the precast synthetic slab can be joined to the lower flange of the beam material with bolts by interposing a beam support, so that a structure such as providing a step in the slab is provided. Excellent flexibility, such as flexibility in design.

A is the fragmentary perspective view which showed the Example of the precast synthetic | combination slab based on this invention, B is the same front view. A and B are front views showing variations of the precast synthetic slab according to FIG. It is the elevation which showed the junction point of the precast synthetic slab and beam material concerning the present invention. It is the elevation which showed the junction point of the precast synthetic slab and beam material concerning the present invention. It is the elevation which showed the junction point of the precast synthetic slab and beam material concerning the present invention. A is the fragmentary perspective view which showed the Example from which the precast synthetic | combination slab which concerns on FIG. 1 differs, B is the same front view.

  Next, an example of a precast synthetic slab according to the present invention, a method for joining the precast synthetic slab and the beam material, and a joint structure will be described with reference to the drawings.

In the precast synthetic slab 1 according to the present invention, as shown in FIG. 1 and the like, a corrugated steel sheet in which peaks 20 and valleys 21 are alternately connected via an inclined portion 22 is provided with a synthesis mechanism such as embossing and keyway. Fixing having bolt holes 3a for joining to the beam member 5 on the lower surfaces of both ends in the length direction (one part is omitted for convenience of illustration) of the deck plate 2 for composite slab (hereinafter, abbreviated as the deck plate 2 as appropriate). A plate 3 is provided, and concrete 4 is cast on the deck plate 2.
In other words, the beam member 5 and the fixing plate 3 and thus the precast synthetic slab 1 can be bolted together.
In addition, although illustration is omitted, inside the concrete 4, crack prevention reinforcing bars such as a welded wire mesh and a different diameter reinforcing steel bar are disposed in a portion having a cover thickness of about 30 mm from the upper surface of the concrete 4 in order to prevent cracks. ing.

  As an example, the fixed plate 3 is made of flat steel having a total length of about 600 mm that is substantially equal to the width of the deck plate 2, a depth of about 70 mm, and a plate thickness of about 6 mm. And the said bolt hole 3a is drilled in the site | part located in the downward direction of the approximate center part of each peak part 20 (2 illustrations) of the said deck plate 2. As shown in FIG.

The composite slab deck plate 2 will be described. The deck plate 2 is formed of a steel plate in which crests 20 and troughs 21 are alternately connected via inclined portions 22 to form a corrugated cross section. The keyway is implemented with a configuration in which the inclined portion 22 is provided with a stepped portion. The dimensions of the deck plate 2 are, for example, a width of about 600 mm (two mountain type), a height (mountain height) of about 50 to 75 mm (in the example shown, 50 mm), and a top of a mountain and a valley (planar portion). The width is about 115 to 125 mm, the plate thickness is about 1.0 to 1.6 mm, and the total length (span length) is about 1.8 to 3.6 m.
In addition, the form (shape, dimension) of the deck plate 2 is not limited to this, and the design can be appropriately changed according to the structural design such as the installation area, the installation interval of the beam members (support beams) 5 and the strength required for the structure. is there.

For example, like the precast synthetic slab 10 shown in FIG. 2A, the above-described two-mount type deck plate 2 and one-mount type deck plate 2 '(width dimension is about 300 mm) are connected (see reference numeral X). Using a composite deck plate, a fixed plate 3 having a length substantially equal to the width of the composite deck plate is fixed to the lower surface of both ends in the length direction, and concrete 4 is placed on the upper surface thereof. It can also be implemented.
Moreover, like the precast synthetic | combination slab 10 'shown to FIG. 2B, the bottom surface of the both ends of the length direction is used using the synthetic deck plate which connected two above-mentioned double mountain type deck plates 2 (refer the code | symbol X part). In addition, the fixing plate 3 having a length substantially equal to the width dimension of the composite deck plate may be fixed, and the concrete 4 may be placed on the upper surface thereof.
Incidentally, the fixed plate 3 according to FIGS. 2A and 2B is implemented with a configuration in which the left end portion does not exist below the joint portion of the deck plate, unlike the fixed plate 3 according to FIG. It is only the result of taking into account the flexibility of

  The concrete thicknesses of the three types of precast synthetic slabs 1, 10, 10 ′ illustrated in FIGS. 1 and 2A and 2B are at least 50 mm even at the portion of the peak portion 20 of the deck plate 2 that is the thinnest portion. (In this embodiment, 65 mm) is ensured.

The fixing plate 3 is joined to the lower surfaces of both end portions in the length direction of the synthetic slab deck plate 2 by means of quenching plug welding.
The significance of adopting the temper plug welding means is to eliminate the use of horizontal braces such as angle braces required when laying ALC panels by increasing the bonding strength between the fixed plate 3 and the deck plate 2. It is in.
That is, the precast synthetic slab 1 (10, 10 ') manufactured by placing the concrete 4 by welding the fixed plate 3 to the deck plate 2 with high strength by means of a stopper plug welding means. By laying bolts 6 on the beam member 5 (see FIGS. 3 to 5), in-plane shearing force such as earthquake generated in the precast synthetic slab 1 (10, 10 ′) is applied to the beam member. As a result, the horizontal brace can be eliminated.
Incidentally, it is generally known that the synthetic slab bears an in-plane shear force greater than that of the angle brace if the concrete thickness of 50 mm or more is present at the top of the peak portion 20 of the deck plate 2. The concrete thickness of the upper part of the peak portion 20 of the precast synthetic slabs 1, 10, 10 ′ satisfies the requirement because it is 65 mm as described above.

And the joining method with the beam material 5 (steel beam) is performed as shown in FIG.
That is, the precast synthetic slab 1 (10, 10 ') having the above-described structure is supported by heavy equipment or the like, dropped vertically from a predetermined portion (see the arrow in the figure), and over the beam member 5 (H-shaped steel). It mounts on the upper surface (substantially central part) of the flange 5a.
A bolt hole 5d is previously formed in the upper flange 5a at a position where the core of the fixing plate 3 and the bolt hole 3a of the fixing plate 3 coincide with each other, and positioning work for aligning the core of the bolt hole 3a and the bolt hole 5d is performed. Do.
Subsequently, the bolt 6 is passed from the upper side (or from the lower side) through the bolt holes 3a and 5d having the same core, and the nut 7 is fastened, whereby the fixing plate 3 is bolted to the upper surface of the upper flange 5a. Thus, the precast synthetic slab 1 (10, 10 ') is bolted to the beam member 5 (upper flange 5a).
In addition, although the bolt joining operation | work of the one end part of the precast synthetic | combination slab 1 (10, 10 ') is demonstrated here, the above-mentioned similar operation | work is performed also about the bolt joining operation | work of an other end part.

FIG. 4 shows a different embodiment of the joining method with the beam member 5. Specifically, this embodiment shows a construction example in the case where a slab is provided with a step according to a client's request or the like.
In this joining method, first, one angle member 8 (size L-70 × 70 × 6 mm in the illustrated example) is adopted as the beam receiving member 8, and the angle member 8 is previously attached to the lower flange 5 b of the beam member 5. The vertical surface of the angle member 8 is welded and joined, and the horizontal surface of the angle member 8 is integrated so as to protrude outward.
Next, the precast synthetic slab 1 (10, 10 ') having the above-described configuration is suspended and supported by a heavy machine or the like, dropped vertically from a predetermined portion (see the arrow in the figure), and placed on the upper surface of the horizontal surface of the angle member 8 Place.
A bolt hole 8a is previously formed in the horizontal surface of the angle member 8 at a position where the core of the fixing plate 3 and the bolt hole 3a of the fixing plate 3 coincide with each other, and positioning for aligning the core of the bolt hole 3a and the bolt hole 8a. Do work.
Subsequently, the fixing plate 3 is bolted to the angle member 8 by passing the bolt 6 from the upper side (or from the lower side) through the bolt holes 3a, 8a having the same core, and fastening the nut 7. Accordingly, the precast composite slab 1 (10, 10 ') is bolted to the beam member 5 (lower flange 5b).
In addition, although the bolt joining operation | work of the one end part of the precast synthetic | combination slab 1 (10, 10 ') is demonstrated here, the above-mentioned similar operation | work is performed also about the bolt joining operation | work of an other end part.

FIG. 5 shows a variation in the case where the slab is constructed by providing a step as shown in FIG.
In this joining method, first, as the beam support 9, two angle members (size L-70 × 70 × 6 mm in the illustrated example) are combined (by welding the back surfaces to each other) and formed into a substantially Z-shaped cross section. (Hereinafter referred to as a cross-sectional Z-shaped metal piece 9), the upper flange of the cross-sectional Z-shaped metal piece 9 is preliminarily overlapped with the lower flange 5b of the beam member 5, and bolts 6 and nuts 7 are used for the important points. It joins and it integrates with the structure which protruded outward the lower flange of the said cross-section Z-shaped metal fixture 9. FIG.
The subsequent work is substantially the same as the work described in FIG. That is, the precast synthetic slab 1 (10, 10 ') having the above-described structure is supported by being suspended by a heavy machine or the like and dropped vertically downward from a predetermined portion (see the arrow in the figure). Place on top.
A bolt hole 9a is previously drilled in the lower flange of the Z-shaped metal piece 9 at a position where the core of the fixing plate 3 coincides with the bolt hole 3a, and the core between the bolt hole 3a and the bolt hole 9a is formed. Perform positioning work to match.
Subsequently, the bolt 6 is passed from the upper side (or from the lower side) through the bolt holes 3a, 9a having the same core, and the nut 7 is fastened, so that the fixing plate 3 is bolted to the cross-section Z-shaped metal piece 9 Accordingly, the precast synthetic slab 1 (10, 10 ') is bolted to the beam member 5 (lower flange 5b).
In addition, although the bolt joining operation | work of the one end part of the precast synthetic | combination slab 1 (10, 10 ') is demonstrated here, the above-mentioned similar operation | work is performed also about the bolt joining operation | work of an other end part.

The bolt joining operation described with reference to FIGS. 3 to 5 effectively uses the space formed by the lower portion of the peak portion 20 of the deck plate 2 and the upper portion of the bolt hole 3a of the fixed plate 3. Therefore, it is possible to realize a very rational joining work with good fit.
The bolt joint structure described with reference to FIGS. 3 to 5 is such that the deck plate 2 (including 2 ′) of the precast synthetic slab 1 (10, 10 ′) and the fixing plate 3 are tempered plug welding means. As shown in FIGS. 3 to 5 above, the fixed plate 3 and the beam member 5 are joined together by bolts, so that the surface such as an earthquake occurred in the precast composite slab 1 (10, 10 ′). A structure that reliably transmits the internal shearing force to the beam member 5 can be realized. Therefore, the precast synthetic slab 1 (10, 10 ′) can bear a load in the horizontal direction, and a structure that ensures sufficient horizontal rigidity can be realized without providing a horizontal brace.

The embodiments of the present invention have been described with reference to the drawings. However, the present invention is not limited to the illustrated examples, and variations of design changes and application that a person skilled in the art normally performs without departing from the technical idea thereof. Note that it includes the range.
For example, in the above embodiment, in order to eliminate the use of horizontal braces such as angle braces, the fixed plate 3 is integrated with the bottom surfaces of both end portions in the length direction of the deck plates 2 and 2 ′ by means of a quenching plug welding means. However, it is not limited to this. As shown in FIG. 6, the shear connector joining means (including the stud welding means) can be integrated and implemented in the same manner. As the shear connector, a metal rod-like member such as a reinforcing bar or a stud is preferably used. Incidentally, in the illustrated example, a headed stud 11 is adopted as a stud. When this shear connector joining means is used, the metal rod-like member (in the illustrated example, a headed stud) contributes to increasing the adhesion strength with concrete, so a precast synthetic slab having superior strength and rigidity can be obtained. realizable.

Moreover, although the precast synthetic | combination slab 1 (10, 10 ') which concerns on the example of illustration is implemented with what is called a full precast synthetic | combination slab, of course, it is not limited to this, It can implement similarly with a half type precast synthetic | combination slab. This is because as long as the deck plate 2 is used, the same operational effects can be obtained.
Furthermore, the present invention is also applied to a precast synthetic slab according to Japanese Patent Application No. 2017-196851 filed earlier by the applicant of the present application, in which the fixing plate 3 is preliminarily used as a synthetic slab deck plate or the like (tempered plug welding means, shear connector joining). It can be easily applied by joining).

DESCRIPTION OF SYMBOLS 1 Precast synthetic slab 2 Synthetic slab deck plate 2 'Synthetic slab deck plate 3 Fixed plate 3a Bolt hole 4 Concrete 5 Beam material (H-section steel)
5a Upper flange 5b Lower flange 5c Web 6 Bolt 7 Nut 8 Beam support (angle material)
8a Bolt hole 9 Beam receiving hardware (Z-shaped hardware)
9a Bolt hole 10 Precast synthetic slab 10 'Precast synthetic slab 11 Headed stud 20 Mountain part 21 Valley part 22 Inclined part

Claims (7)

  For joining to the beam material on the bottom surface of both ends in the longitudinal direction of the deck plate for composite slab, which has a composite mechanism such as embossing and keyway, etc. A precast synthetic slab comprising a fixed plate having bolt holes and concrete cast on the deck plate.   2. The precast synthetic slab according to claim 1, wherein the fixing plate is provided on a lower surface of both end portions in the length direction of the deck plate by a quenching plug welding means or a shear connector joining means.   3. The precast synthetic slab according to claim 1, wherein the bolt hole of the fixing plate is provided in a portion located below a peak portion of the deck plate.   The said fixed plate of the precast synthetic | combination slab in any one of Claims 1-3 is installed in the upper surface of the said beam material, The said precast synthetic slab and the said beam material are bolted using the bolt hole of the said fixed plate. A method of joining a precast synthetic slab and a beam material, characterized by:   The said fixed plate of the precast synthetic | combination slab in any one of Claims 1-3 is installed in the said beam material via a beam receiving metal, The said precast synthetic slab and a beam receiving metal using the bolt hole of the said fixing plate A method of joining the precast synthetic slab and the beam material, wherein the precast synthetic slab and the beam material are joined together by bolting together.   The said fixed plate of the precast synthetic | combination slab in any one of Claims 1-3 is installed in the upper surface of the said beam material, The said precast synthetic slab and the said beam material are bolted using the bolt hole of the said fixed plate. The joint structure of a precast synthetic slab and a beam material characterized by being made.   The said fixed plate of the precast synthetic | combination slab in any one of Claims 1-3 is installed in the said beam material via a beam receiving metal, The said precast synthetic slab and a beam receiving metal using the bolt hole of the said fixing plate The precast synthetic slab and the beam material are joined to each other by bolting them together, and the precast synthetic slab and the beam material are joined together.

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