JP7495305B2 - Precast deck and its installation method - Google Patents

Description

The present invention relates to a precast deck and its installation method.

In the construction of a building, when laying a precast floor slab (precast concrete floor slab, PCa floor slab, PCa panel) on multiple beams assembled into a rectangular frame, measures are taken to lay the precast floor slab at a designated position on the beam. Here, an example of a conventional method of laying a precast floor slab is explained with reference to Figures 1, 2A, and 2B. Figure 1 is a diagram that explains an overview of an example of a conventional method of laying a precast floor slab, and Figures 2A and 2B are diagrams that explain the laying method in detail, respectively.

In the example shown in FIG. 1, all of the beams 20 assembled into a rectangular frame are made of H-shaped steel, each beam 20 has a web 21, an upper flange 22, and a lower flange 23, and a precast floor slab 10 rectangular in plan view is laid at a predetermined position on the upper flange 22 of each beam 20. In FIG. 1, beams 20A and 20B, which are attached perpendicular to each other, are, for example, girths between floors of a building, and beams 20C and 20D, which are small beams, are attached to beam 20B at a predetermined interval, and a beam (not shown) facing beam 20B is attached to these beams 20A, 20C, and 20D, so that multiple beams are assembled into a rectangular frame.

The precast deck 10 has a rectangular top surface 11 and bottom surface 12 in plan view, and side surfaces 13, 14 of different lengths. Suspension wires 18 are attached to multiple suspension jigs 17 attached to the top surface 11, and the deck 10 is suspended to a predetermined position on the beams 20 by heavy machinery (not shown). A band-shaped vibration-proof material 25 is attached to the top surface of the upper flange 22 of each beam 20, and a positioning jig 30 is also attached to determine the installation position of the precast deck 10.

2A and 2B, the positioning jig 30 is formed of an angle iron having a horizontal piece 31 and a vertical piece 32, and the bolt hole 31a in the horizontal piece 31 is aligned with the bolt hole 22a in the upper flange 22 of the beam 20, and the positioning jig 30 is attached to the upper surface of the upper flange 22 by inserting a bolt 35 into both bolt holes 31a and 22a. In the example shown in FIG. 1, when the precast floor slab 10 is laid on each of the upper flanges 22 of the beams 20A, 20B, and 20C, multiple positioning jigs 30 (two in the illustrated example) are attached to each of the upper flanges 22 of the beams 20A and 20B to determine the laying positions of the sides 13 and 14 of the precast floor slab 10.

2A and 2B show the situation where the side surface 14 of the precast floor slab 10 is laid on the upper surface of the upper flange 22 while being guided by the positioning jig 30. As shown in FIG. 2A, the side surface 14 of the precast floor slab 10 is moved from the side in the X1 direction so as to approach the vertical piece 32 of the positioning jig 30, and as shown in FIG. 2B, after the side surface 14 of the precast floor slab 10 is brought into contact with the vertical piece 32, the precast floor slab 10 is hung down in the X2 direction along the vertical piece 32 above the vibration-proof material 25 on the upper surface of the upper flange 22, so that the precast floor slab 10 is laid in a predetermined position on the upper flange 22 of the beam 20 while being guided by the positioning jig 30. Although not shown in the figures, when laying a separate precast deck to the side of a previously laid precast deck 10, in order to ensure a specified gap between the two adjacent precast decks 10 when laying the subsequent precast deck, multiple gap-retaining jigs (not shown) are attached to the corners of the top and side of the preceding precast deck 10, and the subsequent precast deck is laid with the specified gap maintained by the gap-retaining jigs.

The method of laying the precast deck on the upper flange of the beam described above is a conventional laying method, but when it is difficult or impossible to attach a positioning jig to the upper surface of the upper flange of the beam due to the fit of the precast deck, there is a problem that it becomes extremely difficult to precisely lay the precast deck in the specified position on the upper surface of the upper flange of multiple beams. In addition, there is also the problem that laying the precast deck without a positioning jig attached to the upper surface of the upper flange requires time-consuming adjustments, and in some cases, multiple types of construction jigs are required, making the laying work cumbersome.

Here, Patent Document 1 proposes an overlap adjustment jig and an overlap adjustment method using the same, which can solve the problem of uncertain adjustment due to the individual skill of the worker in the overlap adjustment method when laying a precast deck. Specifically, the side of one side of a flat jig body is abutted against the end of the precast deck placed on a beam (here, a beam formwork), and a fixing means for removably fixing the jig body is provided on the side, and a tapered section is provided on the lower part of the jig body to guide the end face position of the end of the precast deck from the upper part to the inside of the beam and set within the overlap range, and a tapered section is provided on the upper part of the jig body to guide the end placed on the beam of the adjacent precast deck to the set position.

JP 2010-180579 A

The overlap adjustment method using the overlap adjustment jig described in Patent Document 1 does not bolt a positioning jig to the top end of the beam (for example, the top surface of the upper flange), but since the overlap adjustment jig is attached to the beam so that it protrudes upward from the top end of the beam and then the precast deck is laid, it does not solve the problem described above, namely, the problem that it is extremely difficult to precisely lay the precast deck in a specified position on the top surface of the upper flanges of multiple beams when it is difficult or impossible to attach a positioning jig to the top surface of the upper flange of the beam.

The present invention was made in consideration of the above problems, and aims to provide a precast deck and a method for laying the same that can precisely lay the precast deck at a predetermined position on the upper surface of the upper flanges of multiple beams, even when it is difficult or impossible to attach a positioning jig to the upper surface of the upper flange of the beam.

In order to achieve the above object, one aspect of the precast floor slab according to the present invention is as follows:
A precast deck is laid on a beam arranged in a rectangular frame shape in such a manner that horizontal movement is restricted.
The device has a rectangular deck body in plan view having two sets of side surfaces facing each other, and an engagement jig attached to the underside of the deck body,
A set of insert nut units composed of a plurality of insert nuts is provided near at least one side surface of each of the two sets of the underside of the deck body,
The engaging jig has an attachment piece that is bolted to the underside of the deck body and an engagement piece that engages with the side of the beam, and the attachment piece is provided with a plurality of sets of bolt hole units each having a bolt hole corresponding to each insert nut of the insert nut unit,
The present invention is characterized in that one of the plurality of sets of bolt hole units is aligned with and bolted to one set of the insert nut units.

According to this embodiment, a set of insert nut units consisting of a plurality of insert nuts is provided near, for example, two mutually orthogonal side surfaces of the underside of the deck body, which is rectangular in plan view, and a plurality of sets of bolt hole units each having a bolt hole corresponding to each insert nut of the insert nut unit are provided on a mounting piece of an engagement jig that engages with the side of a beam, and one of the plurality of bolt hole units is aligned with a set of insert nut units and bolted, so that the precast deck can be precisely laid on a plurality of beams while engaging the engagement jig attached to the underside of the deck body with the side of the orthogonal beam. Here, "laying in a posture in which horizontal movement is restricted" includes both a form in which the horizontal movement of the precast deck is completely restricted (horizontal movement is not possible) and a form in which some horizontal movement is allowed but almost no horizontal movement is possible. In addition, "one set of bolt hole units out of the multiple sets is aligned" means that the mounting piece of the engagement jig is provided with multiple sets of bolt hole units corresponding to multiple standard dimensions of the beam, and among them, one set of bolt hole units corresponding to the standard dimensions of the beam to be constructed is selected and aligned with the insert nut unit. For example, when multiple beams arranged in a rectangular frame are all formed of H-shaped steel, the width of the deck body is set according to the center distance of a pair of opposing beams, but the flange distance (actual beam distance) of the pair of opposing beams will differ depending on the standard dimensions of the beams to be applied. On the other hand, the precast deck of this embodiment is laid by engaging the engagement piece of the engagement jig attached to the underside of the deck body with the side of the upper flange of the beam, for example, so that it is necessary to select a bolt hole unit corresponding to the standard dimensions of the beam to be constructed.

In this embodiment, an engagement jig equipped with multiple sets of bolt hole units corresponding to beams of multiple standard sizes is attached to the underside of the deck body, so that the precast deck can be laid at the desired position of each beam of a planar frame consisting of beams of multiple standard sizes. In the case of beams made of H-shaped steel, there are many standard sizes such as H-125 x 125, H-150 x 150, etc., and it is sufficient to provide the mounting piece with bolt hole units corresponding to the multiple standard sizes that may be applicable.

In addition, by attaching at least one engagement jig near each of the two mutually perpendicular side surfaces of the deck body, which is rectangular in plan view (rectangles include rectangles and squares), each engagement jig engages with the side surfaces of the upper flanges of two mutually perpendicular beams, and as a result, the precast deck can be precisely laid at the desired position of each upper flange of two to four beams out of the multiple beams assembled into a rectangular frame. Furthermore, in order to more stably engage the engagement jigs with the upper flanges of each beam, it is preferable that two engagement jigs are attached near each of the two mutually perpendicular side surfaces of the deck body (thus, a total of four engagement jigs are attached).

Another aspect of the precast floor slab according to the present invention is a precast floor slab that is laid on a beam arranged in a rectangular frame shape in a posture in which horizontal movement is restricted,
The device has a rectangular deck body in plan view having two sets of side surfaces facing each other, and an engagement jig attached to the underside of the deck body,
A plurality of insert nut units each composed of a plurality of insert nuts are provided in the vicinity of at least one side surface of each of the two sets of the underside of the deck body,
The engaging jig has an attachment piece that is bolted to the underside of the deck body and an engaging piece that engages with the side of the beam, and the attachment piece is provided with a set of bolt hole units having bolt holes corresponding to each insert nut of the insert nut unit,
The present invention is characterized in that a set of the bolt hole units is aligned with and bolted to one of the multiple sets of the insert nut units.

In this embodiment, the deck body is equipped with multiple sets of insert nut units, and a set of bolt hole units is aligned with and bolted to one of the multiple sets of insert nut units, making it possible to precisely lay the precast deck over multiple beams while engaging the engagement jig attached to the underside of the deck body on the side of the orthogonal beam.

In another aspect of the precast deck according to the present invention, the engaging piece is characterized by having a hole for an intercepting rope.

According to this aspect, an engagement jig is attached to the underside of the deck body, an engagement piece of the engagement jig protrudes downward, and a hole for the interception rope is provided in the engagement piece, so that the interception rope can be easily attached to the engagement jig, and the precast deck can be pulled to the desired position of the multiple beams via the attached interception rope.

In addition, one aspect of the method for laying a precast deck according to the present invention is to
In the precast deck, the insert nut unit and the bolt hole unit are selected according to the distance between two sets of beams in a rectangular frame shape on which the precast deck is laid, and the precast deck is manufactured by aligning and bolting the corresponding insert nuts and bolt holes, and the precast deck is laid on top of a plurality of beams while engaging the corresponding engaging jig with each set of beams that constitute the two sets of beams in the rectangular frame shape.

According to this aspect, the insert nut unit of the deck body and the bolt hole unit of the engagement jig are aligned according to the standard dimensions of the beams, and the precast deck is manufactured by bolting the two together and laying it on top of multiple beams. This makes it possible to precisely lay the precast deck on top of multiple beams while engaging the engagement jig attached to the underside of the deck body on the side of the beams that are perpendicular to each other.

As can be understood from the above explanation, the precast deck and its installation method of the present invention make it possible to precisely install the precast deck in a predetermined position on the upper surface of the upper flanges of multiple beams, even when it is difficult or impossible to attach a positioning jig to the upper surface of the upper flange of the beam.

FIG. 1 is a diagram illustrating an example of a conventional method for laying a precast deck. FIG. 1 is a diagram illustrating in detail a conventional method for laying a precast deck. 2A and 2B are diagrams for explaining in detail a conventional method for laying a precast deck. FIG. 2 is an exploded perspective view of an example of a precast floor slab according to the first embodiment. 4(a) is a diagram illustrating an example of an engagement jig constituting a precast deck in accordance with the first embodiment, where (a) is an oblique view of the engagement jig from diagonally behind, (b) is a view in the direction of arrow b in FIG. 4(a), and (c) is a view in the direction of arrow c in FIG. 4(a). FIG. 2 is a diagram illustrating an example of a method for laying a precast floor slab according to an embodiment. FIG. 2 is a diagram illustrating in detail a method for laying a precast deck according to an embodiment. 6A , which is a diagram for explaining in detail the method for laying the precast deck according to the embodiment. FIG. This is a diagram showing the state in which a precast deck is laid on a beam.

Below, an example of a precast deck and its installation method according to an embodiment will be described with reference to the attached drawings. Note that in this specification and the drawings, substantially identical components may be designated by the same reference numerals to avoid redundant explanation.

[Precast floor slab according to the first embodiment]
First, an example of a precast floor slab according to the first embodiment will be described with reference to Fig. 3 and Fig. 4. Here, Fig. 3 is an exploded perspective view of an example of a precast floor slab according to the embodiment. Also, Fig. 4 is a view explaining an example of an engagement jig constituting a precast floor slab according to the embodiment, Fig. 4(a) is a perspective view of the engagement jig seen from diagonally rearward, Fig. 4(b) is a view in the direction of the arrow b in Fig. 4(a), and Fig. 4(c) is a view in the direction of the arrow c in Fig. 4(a).

The illustrated precast deck 60 has a deck body 40 with an upper surface 41 and a lower surface 42 that are rectangular wide surfaces when viewed from above, and two sets of mutually opposing side surfaces 43, 44, and multiple (four in the illustrated example) engaging jigs 50 attached to the lower surface 42 of the deck body 40.

The precast deck 60 is a dry deck, and an ALC (autoclaved light weight concrete) deck (ALC panel) or a precast concrete deck (PCa deck, PCa panel) is used.

A set of insert nut units 45A, 45B is provided by embedding two insert nuts 46 at a predetermined interval on each of the adjacent lines S1, S2 of the mutually orthogonal side surfaces 43, 44 of the underside 42 of the deck body 40. In the illustrated example, two insert nut units 45A, 45B are provided on each of the adjacent lines S1, S2. In addition to the illustrated example, one insert nut unit 45A, 45B may be provided on each of the adjacent lines S1, S2.

The engagement jig 50 that engages with the beam 20 is aligned with each insert nut unit 45, and the two are bolted together. As shown in FIG. 4(a), the engagement jig 50 is formed from an angle iron having an attachment piece 51 that is bolted to the underside 42 of the deck body 40, and an engagement piece 52 that engages with the side of the beam 20 (e.g., the side of the upper flange 22).

As shown in Example 4(b), the mounting piece 51 is provided with multiple sets (four sets in the illustrated example) of bolt hole units 53 each having multiple (two in the illustrated example) bolt holes 54 corresponding to each insert nut 46 of the insert nut unit 45 on the underside 42 of the deck body 40.

The multiple beams 20 arranged in a rectangular frame on which the precast floor slab 60 is laid are generally formed of H-shaped steel as shown in FIG. 1, and the engagement pieces 52 of the engagement jigs 50 constituting the precast floor slab 60 are engaged with the side of the upper flange 22 of each beam 20. In the multiple beams 20 arranged in a rectangular frame, the width of the floor slab body 40 is set according to the center distance between a pair of opposing beams 20, but the flange distance (actual beam distance) between the pair of opposing beams 20 will differ depending on the standard dimensions of the beams 20 (H-shaped steel) applied. On the other hand, the precast floor slab 60 is laid in a position determined by engaging the engagement pieces 52 of the engagement jigs 50 attached to the underside 42 of the floor slab body 40 with the side of the upper flange 22 of the beam 20, so that the bolt hole units 53 must be provided in the attachment pieces 51 at positions corresponding to the standard dimensions of the beams 20 to be constructed.

As shown in FIG. 4(b), the mounting piece 51 of the engagement jig 50 is provided with four sets of bolt hole units 53A to 53D corresponding to the beams 20 of multiple types (four types in the illustrated example). The engagement piece 52 is also provided with a hole 55 for a sparring rope. If there are four types of standard dimensions of H-shaped steel that may be applicable at the construction site, namely H-125×125, H-150×150, H-175×175, and H-200×200, the corresponding bolt hole units 53A to 53D are provided on the lines L1 to L4 corresponding to each standard dimension. In the illustrated example, the bolt hole unit 53A on the line L1 closest to the engagement piece 52 is the bolt hole unit corresponding to H-200×200, and the bolt hole unit 53D on the line L4 furthest from the engagement piece 52 is the bolt hole unit corresponding to H-125×125. Additionally, bolt hole unit 53B on line L2 is a bolt hole unit that corresponds to H-175x175, and bolt hole unit 53C on line L3 is a bolt hole unit that corresponds to H-150x150.

The distance between the two bolt holes 54 that make up each bolt hole unit 53 is set to be the same as the distance between the two insert nuts 46 that make up each insert nut unit 45. Although not shown, it is preferable that the standard dimensions of the beam 20 to be laid are displayed on each side 43, 44 of the deck body 40, and that the mounting piece 51 of the engagement jig 50 displays the standard dimensions of the beam corresponding to each bolt hole unit 53A to 53D.

The manufacturer (assembler) of the precast deck selects a bolt hole unit 53 that corresponds to the standard dimensions of the beam 20 displayed on the deck body 40, aligns the two bolt holes 54 of the selected bolt hole unit 53 with the two insert nuts 46 of each insert nut unit 45, and screws a bolt into the corresponding insert nut 46 and bolt hole 54, thereby producing a precast deck 60 with an engagement jig 50 attached to the underside 42 of the deck body 40 at a position that corresponds to the standard dimensions of the beam 20 to be laid.

In the precast deck 60, at least one engagement jig 50 is attached to the vicinity of each of the two mutually orthogonal side surfaces 43, 44 of the deck body 40, which is rectangular in plan view, so that each engagement jig 50 engages with the side surfaces of the upper flanges 22 of the two mutually orthogonal beams 20. Therefore, the precast deck 60 can be precisely laid at the desired position of each upper flange 22 of two to four beams 20 out of the multiple beams 20 assembled in a rectangular frame shape. In particular, as shown in the illustrated example, two engagement jigs 50 are attached to the vicinity of each of the two mutually orthogonal side surfaces 43, 44 of the deck body 40, so that the precast deck 60 can be laid more stably on the upper surface of the upper flange 22 of each beam 20.

By applying the precast floor slab 60, the precast floor slab 60 can be laid at a predetermined position on a plurality of beams 20 while engaging the plurality of engagement jigs 50 attached to the underside 42 of the floor slab main body 40 with the side of the upper flange 22 of the beam 20. Therefore, even if it is difficult or impossible to attach a positioning jig to the upper surface of the upper flange 22 of the beam 20, the precast floor slab 60 can be precisely laid at a predetermined position on the upper surface of the upper flange 22 of the plurality of beams 20. In addition, even if there are beams 20 of multiple standard sizes that may be applicable at the site, the bolt hole units 53 corresponding to the beams 20 of multiple standard sizes are provided on the attachment pieces 51 of the engagement jig 50, so that the bolt hole units 53 corresponding to the beams 20 of the standard sizes to be laid can be selected and bolted to the insert nut units 45 provided on the floor slab main body 40, thereby making it possible to produce a precast floor slab 60 corresponding to the beams 20 of the applicable standard sizes on an ad hoc basis.

In addition, in the precast deck 60, the engagement jig 50 is attached to the underside 42 of the deck body 40 with the engagement piece 52 protruding downward, and the downward-protruding engagement piece 52 is provided with a hole 55 for the interception rope, so that the interception rope 19 (see Figure 5) can be easily attached to the engagement piece 52, and the precast deck 60 can be pulled to the desired position of the multiple beams 20 via the attached interception rope 19.

[Precast floor slab according to the second embodiment]
Next, an example of a precast floor slab according to the second embodiment will be described without referring to any drawings that directly explain the precast floor slab. In addition, in order to facilitate understanding of the description, Figures 3 and 4 will be referred to as appropriate.

The precast deck according to the second embodiment is different from the precast deck 60 according to the first embodiment in that a plurality of sets of insert nut units, each consisting of two insert nuts 46, are provided on the adjacent lines S1 and S2 of the mutually orthogonal side surfaces 43 and 44 of the underside 42 of the deck body 40 shown in FIG. 3. Two insert nut units are provided on each of the adjacent lines S1 and S2, and each insert nut unit has a plurality of sets of insert nut units corresponding to beams 20 of a plurality of standard sizes. For example, in a form corresponding to beams 20 of four standard sizes, like the engagement jig 50 shown in FIG. 4, four sets of insert nut units x two sets (a total of sixteen insert nuts) are provided on the adjacent lines S1 and S2, respectively.

On the other hand, the mounting piece of the engagement jig applied to the precast deck in the second embodiment only needs to be provided with a set of bolt hole units consisting of two bolt holes.

The precast floor slab according to the second embodiment can also be laid at a predetermined position on a plurality of beams 20 while engaging the plurality of engagement jigs 50 attached to the underside 42 of the floor slab main body 40 with the side of the upper flange 22 of the beam 20. Therefore, even if it is difficult or impossible to attach a positioning jig to the upper surface of the upper flange 22 of the beam 20, it is possible to precisely lay the precast floor slab at a predetermined position on the upper surface of the upper flange 22 of the plurality of beams 20. In addition, even if there are beams 20 of multiple standard sizes that may be applicable at the site, the underside 42 of the floor slab main body 40 is provided with insert nut units 45 corresponding to the beams 20 of multiple standard sizes, so that it is possible to select the insert nut unit 45 corresponding to the beam 20 of the standard size to be laid and bolt it to the bolt hole unit 53 provided in the engagement jig 50, thereby making it possible to produce a precast floor slab corresponding to the beam 20 of the applicable standard size on an ad hoc basis.

[Method of laying precast floor slab according to embodiment]
Next, an example of a method for laying a precast floor slab according to an embodiment will be described with reference to Figures 5 to 7. Here, Figure 5 is a diagram for explaining an overview of an example of a method for laying a precast floor slab according to an embodiment. Also, Figures 6A and 6B are diagrams for explaining in detail the method for laying a precast floor slab according to an embodiment, and Figure 7 is a diagram showing a state in which the precast floor slab is laid on a beam.

In the example shown in FIG. 5, all of the beams 20 assembled into a rectangular frame are made of H-shaped steel, each beam 20 has a web 21, an upper flange 22, and a lower flange 23, and a precast floor slab 60 rectangular in plan view is laid at a predetermined position on the upper flange 22 of each beam 20. In FIG. 5, beams 20A and 20B, which are attached perpendicular to each other, are, for example, girder beams between floors of a building, and beams 20C and 20D, which are small beams, are attached to beam 20B at a predetermined interval, and a beam (not shown) facing beam 20B is attached to these beams 20A, 20C, and 20D, so that multiple beams are assembled into a rectangular frame.

The precast deck 60 is attached to a number of hanging jigs 17 (see Figure 1) attached to the upper surface 41 of the deck body 40, with hanging wires 18 attached, and is suspended down to a predetermined position on the beams 20 by heavy machinery (not shown). A band-shaped vibration-proof material 25 (see Figure 1) is attached to the upper surface of the upper flange 22 of each beam 20.

In each engagement jig 50 constituting the precast deck 60, a bolt hole unit 53 corresponding to the standard dimensions of each beam 20A, 20B, 20C, etc. to be laid is selected, and the two bolt holes 54 of the selected bolt hole unit 53 are aligned with the two insert nuts 46 of each insert nut unit 45 provided on the underside 42 of the deck body 40, and a bolt 48 is screwed into the corresponding insert nut 46 and bolt hole 54 to produce a precast deck 60 in which the engagement jig 50 is attached at a position corresponding to the standard dimensions of the beam 20 to be laid on the underside 42 of the deck body 40. Note that even if the standard dimensions of the opposing beams 20A and 20C are different from each other, a suitable bolt hole unit 53 is selected in the engagement jig 50 and bolted to the insert nut unit 45 so that the deck body 40 is laid at a predetermined position of the upper flange 22 of each beam 20A and 20B.

When the precast deck 60 suspended by the hoisting wires 18 is to be pulled to a specified position, the interception rope 19 is attached to the interception rope hole 55 of the engagement piece 52 of the engagement jig 50, which is attached to the underside 42 of the deck body 40 in a manner that protrudes downward, and the worker pulls the interception rope 19 to pull the precast deck 60 to the desired position of the multiple beams 20.

As shown in FIG. 6A, the side surface 43 of the deck body 40 of the precast deck 60 is moved so as to approach the beam 20 from the side in the X3 direction, and as shown in FIG. 6B, the engagement piece 52 of the engagement jig 50 bolted to the underside 42 of the deck body 40 is aligned with the side surface 22b of the upper flange 22 of the beam 20, and then the precast deck 60 is hung down in the X4 direction above the vibration-proof material 25 on the upper surface of the upper flange 22 along the side surface 22b of the upper flange 22. As shown in FIG. 7, the underside 42 of the deck body 40 of the precast deck 60 is laid in a predetermined position on the upper flange 22 of the beam 20 while being guided by the two engagement pieces 52. Note that FIG. 7 shows a state in which the deck body 40 is laid on the upper surface of the upper flange 22 of one beam 20, but in reality, the precast deck 60 is laid in a posture in which horizontal movement is restricted with respect to each of the upper flanges 22 of the three beams 20A, 20B, and 20C shown in FIG. 1, for example.

According to the illustrated method of laying a precast floor slab, by applying the precast floor slab 60, even if it is difficult or impossible to attach a positioning jig to the upper surface of the upper flange 22 of the beam 20, it is possible to precisely lay the precast floor slab 60 at a predetermined position on the upper surface of the upper flange 22 of multiple beams 20. Although not illustrated, when laying a separate precast floor slab 60 to the side of a previously laid precast floor slab 60, in order to lay the subsequent precast floor slab 60 while securing a predetermined gap between the two adjacent precast floor slabs 60, multiple gap retaining jigs (not shown) are attached to the corners of the upper surface and side of the preceding precast floor slab 60, and the subsequent precast floor slab 60 is laid while securing a predetermined gap with the gap retaining jigs.

The present invention is not limited to the configuration shown here, and other embodiments may be possible in which other components are combined with the configurations described in the above embodiments. In this regard, changes can be made without departing from the spirit of the present invention, and can be determined appropriately according to the application form.

17: Lifting jig 18: Lifting wire 19: Execution rope 20, 20A, 20B, 20C, 20D: Beam 21: Web 22: Upper flange 22a: Bolt hole 22b: Side 23: Lower flange 40: Deck body 41: Upper surface 42: Lower surface 43, 44: Side 45, 45A, 45B: Insert nut unit 46: Insert nut 48: Bolt 50: Engagement jig 51: Mounting piece 52: Engagement piece 53, 53A, 53B, 53C, 53D: Bolt hole unit 54: Bolt hole 55: Hole for execution rope 60: Precast deck

Claims (4)

A precast deck is laid on a beam arranged in a rectangular frame shape in such a manner that horizontal movement is restricted.
The device has a rectangular deck body in plan view having two sets of side surfaces facing each other, and an engagement jig attached to the underside of the deck body,
A set of insert nut units composed of a plurality of insert nuts is provided near at least one side surface of each of the two sets of the underside of the deck body,
The engaging jig has an attachment piece that is bolted to the underside of the deck body and an engagement piece that engages with the side of the beam, and the attachment piece is provided with a plurality of sets of bolt hole units each having a bolt hole corresponding to each insert nut of the insert nut unit,
A precast deck, characterized in that one set of the bolt hole units out of a plurality of sets is aligned with and bolted to a set of the insert nut units. A precast deck is laid on a beam arranged in a rectangular frame shape in such a manner that horizontal movement is restricted.
The device has a rectangular deck body in plan view having two sets of side surfaces facing each other, and an engagement jig attached to the underside of the deck body,
A plurality of insert nut units each composed of a plurality of insert nuts are provided in the vicinity of at least one side surface of each of the two sets of the underside of the deck body,
The engaging jig has an attachment piece that is bolted to the underside of the deck body and an engaging piece that engages with the side of the beam, and the attachment piece is provided with a set of bolt hole units having bolt holes corresponding to each insert nut of the insert nut unit,
A precast deck, characterized in that a set of the bolt hole units are aligned with and bolted to one of a plurality of sets of the insert nut units. The precast deck according to claim 1 or 2, characterized in that the engagement piece is provided with a hole for an intercepting rope. A method of laying a precast floor slab according to any one of claims 1 to 3, comprising: selecting the insert nut unit and the bolt hole unit according to the distance between two sets of beams in a rectangular frame shape on which the precast floor slab is laid; aligning and bolting the corresponding insert nuts and bolt holes to produce the precast floor slab; and laying the precast floor slab on a plurality of beams while engaging the corresponding engaging jigs with each set of beams constituting the two sets of beams in the rectangular frame shape.

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