JP6062779B2 - Reinforcing bar positioning device and curved surface slab construction method using reinforcing bar positioning device - Google Patents

Description

  The present invention relates to a reinforcing bar positioning device for positioning a reinforcing bar on a curved surface forming a formwork surface of a mold for forming a curved slab, and a curved surface slab construction method using the reinforcing bar positioning device.

In order to form a slab, when arranging a plurality of lower rebars and a plurality of upper rebars constituting the lower slab rebar on a horizontal formwork surface, the spacer having the rebar mounting part is horizontal. A plurality of lower bars are placed at predetermined positions on the mold surface, and a plurality of lower reinforcing bars are placed on the reinforcing bar placement part and arranged so as to be positioned parallel to each other on a horizontal plane parallel to the mold surface, Further, a plurality of upper rebars arranged on the plurality of lower rebars so as to be orthogonal to the plurality of lower rebars are positioned parallel to each other on a horizontal plane parallel to the formwork surface. There has been known a method of arranging the lower slab muscle by arranging the lower slab muscle by arrangement (see, for example, Patent Document 1).
In addition, a method of constructing a curved slab using a mold having a mold surface formed on a curved surface is known (see, for example, Patent Document 2).

JP 2005-133466 A Japanese Patent Laid-Open No. 5-179801

When arranging a plurality of lower reinforcing bars constituting the slab lower bars on a curved surface parallel to the curved surface forming the mold surface on the mold surface of the mold for constructing the curved surface slab, for example, the mold When the curved surface of the frame is composed of the arc surface of the lower part of the cylinder, the lower rebars extend in parallel along the center axis of the cylinder and the circumference of the arc surface The bars are arranged so as to be arranged at equal intervals in the direction along the line. In this case, the positions of the plurality of lower reinforcing bars can be obtained by marking the formwork surface, and for example, the plurality of lower reinforcing bars can be positioned using the spacer disclosed in Patent Document 1.
However, in this case, the positions of the multiple lower reinforcing bars must be determined by inking, and the multiple lower reinforcing bars must be positioned at the positions determined by inking. The operation of positioning the plurality of lower reinforcing bars on the formwork surface becomes complicated.
The present invention relates to a reinforcing bar positioning device capable of easily and easily positioning a plurality of reinforcing bars at intervals in a direction along a curved surface forming a mold surface of a mold for constructing a curved slab, and the reinforcing bar positioning device A method for constructing a curved slab using slab is provided.

The reinforcing bar positioning device according to the present invention includes a plurality of reinforcing bar positioning members each having a reinforcing bar mounting at one end and a mounting plate, and the plurality of reinforcing bar positioning members are orthogonal to the flat plate surface of the mounting plate and extend in one direction. The other end portions of the plurality of reinforcing bar positioning members are fixed to the mounting plate so as to be spaced apart from each other, so that the formwork having a mold surface in which one end of the plurality of reinforcing bar positioning members is formed into a curved surface is provided. The flat plate surface of the mounting plate of the reinforcing bar positioning device is deformed into a curved surface parallel to the mold frame surface by being installed on the mold surface, and each reinforcing bar mounting provided at one end of the plurality of reinforcing bar positioning members is the mold frame. Since it is located on a curved surface parallel to the surface, each reinforcing bar is placed on a plurality of reinforcing bar platforms, and spaced apart in the direction along the curved surface that forms the form surface of the formwork for constructing the curved slab. Easy and easy positioning of multiple reinforcing bars It made.
Since the mounting plate is a spring plate and the flat plate surface of the mounting plate is elastically deformed into a curved surface parallel to the formwork surface, a reinforcing bar positioning device that can be used any number of times can be provided as long as it is used in the elastic deformation region.
Each of the reinforcing bar positioning members is fixed to the mounting plate so that the length from the flat surface of the mounting plate to the one end is the same, and the length from the reinforcing bar mounting to one end of the reinforcing bar positioning member Therefore, the distance between each reinforcing bar positioned on each reinforcing bar and the formwork surface can be made equal, and the concrete cover thickness of the curved slab can be made uniform.
The curved surface slab construction method according to the present invention uses the above-described reinforcing bar positioning device and installs one end of a plurality of reinforcing bar positioning members on the formwork surface of the formwork having a formwork surface formed into a curved surface. Deforming the flat plate surface of the mounting plate of the apparatus into a curved surface parallel to the mold surface and positioning each reinforcing bar mounting provided at one end of the plurality of reinforcing bar positioning members on a curved surface parallel to the mold surface; A step of placing reinforcing bars on a plurality of reinforcing bars placed on a curved surface parallel to the formwork surface, and a plurality of reinforcing bars placed on the reinforcing bars on the plurality of reinforcing bars so as to cross these reinforcing bars Furthermore, a plurality of reinforcing bars are arranged, and the upper and lower reinforcing bars are bound to form a lower slab reinforcement, the lower slab reinforcement is supported on the formwork surface using a reinforcing bar support, and the lower slab reinforcement is Support on the formwork surface with a reinforcing bar support Removing the reinforcing bar positioning device from the formwork surface in a state, placing the upper slab reinforcement above the lower slab reinforcement, placing concrete on the formwork after the placement, Building a curved slab in which the surface of the concrete that was in contact with the formwork surface is formed into a curved surface by removing the formwork after the hardened concrete is hardened. Can do.
In addition, place the void on the lower slab bar so that the lower end of the void formed of a material that is lighter in unit volume than concrete fits into the rectangular frame surrounded by the upper and lower reinforcing bars that make up the lower slab bar Since the installation step is provided, the void can be accurately installed on the formwork surface, and the curved surface slab whose weight is reduced by the void can be easily and easily constructed.

The side view which shows the state in which the reinforcing bar positioning apparatus was installed on the formwork surface formed in the curved surface, and the reinforcing bar was mounted on the reinforcing bar mounting. (A) is a perspective view which shows the state in which the reinforcing bar positioning member was attached to the mounting plate, (b) is an exploded perspective view of the reinforcing bar positioning device. The perspective view which shows the state in which the reinforcing bar positioning device was installed on the formwork surface formed in the curved surface, and the reinforcing bar was mounted on the reinforcing bar mounting. The figure which shows the state by which the void was arrange | positioned on the reinforcing bar arranged on the curved formwork surface.

  As shown in FIG. 1, the reinforcing bar positioning device 1 includes a plurality of reinforcing bar positioning members 2; 2... And a single mounting plate 3 to which the plurality of reinforcing bar positioning members 2; 2.

  The mounting plate 3 is configured by a plate having a large elastic limit, for example, a metal spring plate having a rectangular flat plate surface that is long in one direction X.

The reinforcing bar positioning member 2 has a configuration in which one end portion 4 includes a reinforcing bar mount 5 and the other end portion 6 includes an attachment portion 7 to the attachment plate 3.
In other words, the reinforcing bar positioning member 2 is attached to the bar 10, the reinforcing bar mounting part 11 provided at one end 4 of the bar 10, and the mounting plate 3 provided at the other end 6 of the bar 10. It is the structure provided with the attaching part 7 and the reinforcing bar mounting 5 attached to the one end part 4 of the bar 10 by the reinforcing bar mounting part 11.

As shown in FIG. 2, the bar 10 has a configuration in which a male screw portion 15 is formed at the other end portion 6.
The reinforcing bar mount 5 is formed of, for example, a flat plate having a reinforcing bar mounting portion 16 such as a concave portion into which the reinforcing bar enters a rectangular flat plate surface.
The mounting plate 3 includes a through-hole 17 through which the male screw portion 15 formed in the other end portion 6 of the bar 10 passes, and the reinforcing bar mount 5 includes a through-hole 18 through which the one end 4 of the bar 10 passes.

  The reinforcing bar mounting part 11 has a configuration in which, for example, the reinforcing bar mounting 5 is rotatably attached to one end portion 4 of the bar 10 with the central axis of the bar 10 as the rotation center. For example, a pair of shock-absorbing materials 20; 20 provided so as to sandwich the reinforcing bar mounting 5 between the one end 4 of the bar 10 passing through the through hole 18 of the reinforcing bar 5 and the one end 4 of the bar 10 It is the structure provided with a pair of buffer material stoppers 21; 21 provided so that the said pair of buffer material 20; 20 and the reinforcing bar mounting 5 may be pinched | interposed. The buffer material 20 is formed of, for example, an annular plate that is formed of an elastic body, a synthetic resin, a metal, or the like and has a through hole 23 through which the one end 4 of the bar 10 passes. The buffer material stopper 21 is configured by a nut that is screwed to the one end portion 4 of the bar member 10 in the configuration in which the male screw portion 4 a (see FIG. 2) is formed at the one end portion 4 of the bar member 10. In the configuration in which the male thread portion is not formed on the one end portion 4, the one end portion 4 of the bar member 10 is formed by an annular body having a through-hole, and the one end portion 4 of the rod member 10 is the annular member. What is necessary is just to set it as the structure by which the said annular body is fixed to the said one end part 4 by fixing means, such as welding and adhesion | attachment, in the state penetrated by this through-hole.

  The attachment portion 7 to the attachment plate 3 is composed of a pair of nuts 25; 25 screwed so as to sandwich the attachment plate 3 with the male screw portion 15 of the other end portion 6 of the bar 10 that has passed through the through hole 17 of the attachment plate 3. In this configuration, the pair of nuts 25; 25 are fastened and the mounting plate 3 is sandwiched and fixed by the pair of nuts 25; 25.

The plurality of reinforcing bar positioning members 2; 2... Are arranged in a straight line or substantially in a straight line at equal intervals, for example, along one direction X of the single mounting plate 3 orthogonal to the flat plate surface of the single mounting plate 3. In addition, one mounting plate is provided by the mounting portion 7 so that the length from one flat surface 3a to the one end 4t of the mounting plate 3 which is the surface facing the mold surface 31 is the same length, for example. 3 is attached. Further, the reinforcing bar mounting members 11 are connected to the reinforcing bar positioning members 2 so that the lengths from the reinforcing bar mountings 5 to one end 4t of the reinforcing bar positioning member 2 are, for example, the same. 2 attached.
In this way, the other end portions 6; 6... Are fixed to the mounting plate 3 such that the lengths from the flat plate surface of the mounting plate 3 to the one end 4t are the same. Further, the reinforcing bars having the respective reinforcing bar mountings 5; 5 ... so that the lengths from the reinforcing bar mountings 5; 5 ... to the ends 4t; 4t ... of the reinforcing bar positioning members 2; If the positioning device 1 is used, when the distance between each rebar 35; 35... Positioned on each rebar mount 5; 5... And the formwork surface 31 is equal, and a curved surface slab is constructed, The concrete cover thickness of curved slabs can be made uniform.
Further, the plurality of reinforcing bar positioning members 2; 2... Are arranged from the flat plate surface of the mounting plate 3 to the one end 4 t so as to be arranged at equal intervals along one direction perpendicular to the flat plate surface of the mounting plate 3. The other end portions 6; 6... Are fixed to the mounting plate 3 so as to have the same length, and from the reinforcing bar mounts 5; 5... To the one end 4t of each reinforcing bar positioning member 2; Are used at the same distance in the direction along the curved surface forming the formwork surface 31 by using the reinforcing bar positioning device 1 having the reinforcing bar mounts 5; The plurality of reinforcing bars 35; 35... Can be positioned easily and easily.

  That is, in the reinforcing bar positioning device 1, each end 4t: 4t of the plurality of reinforcing bar positioning members 2; 2... Is installed on the curved surface that forms the mold surface 31 of the mold 30 for constructing the curved slab and the mounting plate. 3 is elastically deformed into a curved surface parallel to the curved surface of the mold surface 31 (a curved surface having the same curvature as that of the curved surface of the mold surface 31), whereby one end portions 4 of the plurality of reinforcing bar positioning members 2; Are arranged on a curved surface parallel to the curved surface of the formwork surface 31, and are respectively placed on the plurality of reinforcing steel platforms 5; 5. Is a device that positions the plurality of lower rebars 35; 35... On the curved surface parallel to the curved surface of the mold surface 31 of the mold 30 (on the curved surface of the mold surface 31 having the same curvature). is there.

A method for positioning a reinforcing bar on a mold surface 31 formed on the curved surface of the mold 30 and a method for constructing a curved slab using the reinforcing bar positioning device 1 configured as described above are shown in FIG. explain.
For example, a curved slab having an arc surface that is formed by continuous arc lines protruding downward in the direction along the central axis of the cylinder, such as an arc surface forming a part of the outer peripheral surface of the cylinder. A case of construction will be described as an example.

First, the mold 30 is formed that forms the mold surface 31 having the same arc surface as the arc surface of the curved slab to be constructed.
Then, the reinforcing bar positioning device 1 is installed on the mold surface 31 so that the plurality of reinforcing bar positioning members 2; 2... Are aligned in the direction along the circumference of the arc surface forming the mold surface 31. Then, the mounting plate 3 is bent so as to form an arc surface having the same center axis as the center axis of the arc surface of the mold surface 31, and the ends 4t; 4t ... of the plurality of reinforcing bar positioning members 2; It contacts the formwork surface 31. As a result, the rebar mounting bases 5; 5... Provided at the ends 4t; 4t... Of the plurality of rebar positioning members 2; It is located on (the arc surface having the same curvature as the arc surface of the mold surface 31).
In this case, as shown in FIG. 1, the protruding directions of the reinforcing bar mounts 5; 5 ... provided so as to protrude from the bars 10; 10 ... of the reinforcing bar positioning members 2; Since the vertical surface 30S passing through the lowermost portion of the arc surface forming the surface 31 is determined in a direction away from the vertical surface 30S, the surface 31 is placed on each reinforcing bar 5; Since each rebar 35; 35 ... moves in the direction of the vertical surface 30S and is locked to the bar 10; 10 ..., each rebar 35; 35 ... can be prevented from falling from each rebar mount 5; In addition, each of the reinforcing bars 35; 35... Can be accurately positioned at a position based on the bar 10;

Further, on the formwork surface 31 at a position spaced from the position on the formwork surface 31 where the reinforcing bar positioning device 1 is installed in the direction along the central axis of the arc surface of the formwork surface 31 as described above. Another reinforcing bar positioning device 1 is installed. That is, a plurality of reinforcing bar positioning devices 1; 1... Are installed at intervals in a direction along the central axis of the arc surface of the mold surface 31.
Then, the lower reinforcing bar 35 constituting the lower slab bar 37 (see FIG. 4) is located on a straight line along the central axis of the arc surface of the formwork surface 31. And the rebar mounting stand 5 of the other rebar positioning device 1. That is, a pair of reinforcing bar mountings 5 of one reinforcing bar positioning device 1 and a reinforcing bar mounting 5 of the other reinforcing bar positioning device 1 which are located on a straight line along the central axis of the arc surface of the mold surface 31. A plurality of reinforcing bar mounts 5; 5 are configured, and the reinforcing bar mounts 5; Accordingly, the plurality of lower reinforcing bars 35; 35... Of the slab lower bars 37 arranged so as to be parallel to and parallel to the central axis of the arc surface of the mold surface 31 are arc surfaces of the mold surface 31. On the circular arc surface having the same central axis as the central axis, the positions of the circular arc surfaces are positioned at equal intervals in the direction along the circular arc.

Then, as shown in FIG. 4, on the arc surface having the same center axis as the center axis of the arc surface of the mold surface 31, a plurality of lower sides installed at intervals in the direction along the arc of the arc surface. On the rebars 35; 35... Along the central axis of the arc surface of the mold surface 31 so that the plurality of lower rebars 35; A plurality of upper reinforcing bars 36; 36 are arranged by connecting the portions where the upper and lower reinforcing bars 35; 36 intersect with each other by a binding line (not shown). The lower slab rebar 37 composed of the side rebars 35; 35... And the plurality of upper rebars 36;
Thereafter, the arranged lower slab reinforcement 37 is supported on the mold surface 31 using a reinforcing bar support such as a spacer (not shown).
Then, the rebar positioning device 1 is moved so that the rebar positioning device 1 is moved upward after the rebar mounting table 5 is rotated from the lower position of the rebar 35 by rotating the rebar mounting table 5 around the bar 10 as the rotation center. By removing from the frame surface 31, the lower slab line 37 is installed on the mold surface 31.

  Next, as shown in FIG. 4, in order to reduce the weight of the curved slab, a void formed of a lightweight material such as polystyrene foam is placed on the lower slab muscle 37. For example, when a cylindrical void 40 (see FIG. 4) having both ends formed in an arcuate shape or a spherical void outside the figure is embedded in a curved slab, the circumference of the arcuate surface forming the formwork surface 31 is aligned. The distance between the central axes 41; 41 of the voids 40; 40 that are adjacent to each other in the determined direction is determined by the length of the connecting member 45 such as a wire mesh that connects the upper arcuate surface portion 42 that is the upper end of the void 40. At this time, the lower slab rebar 37 is configured so that the lower arcuate surface portion 43 serving as the lower end portion of the void 40 enters the square frame surrounded by the reinforcing bars 35 and 36 formed by the reinforcement of the slab lower rebar 37. It is desirable to determine the position of the lower rebar 35.

When the plurality of voids 40; 40... Connected by the connection material 45 such as a wire mesh are installed on the lower slab muscle 37, the connection material 45 connecting the plurality of voids 40; 40. Therefore, the distance between the upper ends on the central axes 41; 41 of the adjacent voids 40; 40 is different from the distance between the lower ends.
Accordingly, according to the distance between the central axes 41; 41 of the void 40; 40 and the width of the void 40, the distance between the plurality of lower reinforcing bars 35; 35 constituting the lower slab reinforcement 37 is determined. When the interval is marked on the curved surface of the mold surface 31 of the mold 30 and the lower rebar 35; 35 is positioned in accordance with the marked position, the rebar 35 shown by the white circle in FIG. The position of the lower arc surface portion 43 of the void 40 that is actually installed is positioned at a position different from the positions on both sides (both sides in the direction along the curved surface of the mold surface 31).
Thus, when the pair of reinforcing bars 35; 35 are positioned at positions different from the positions on both sides of the lower arc surface portion 43 of the void 40 where the void 40 is actually installed, the lower arc surface portion 43 serving as the lower end portion of the void 40 is a slab. It does not enter the square frame surrounded by the reinforcing bars 35 and 36 formed by the bar arrangement of the lower bar 37. In this case, since the lower arc surface portion 43 of the void 40 is placed on the reinforcing bar 35 and the position of the void 40 is shifted upward, the upper slab reinforcement 37A cannot be arranged as designed, or the concrete cover as designed. There is a possibility that the thickness cannot be secured.

On the other hand, as in the embodiment, the plurality of reinforcing bar positioning members 2; 2... Are spaced apart from each other along the one direction X of one mounting plate 3 perpendicular to the flat surface of one mounting plate 3 (see FIG. 1). And the length from one flat surface 3a to one end 4t of the mounting plate 3 that is the surface facing the mold surface 31 is the same length, and the length is connected The plurality of voids 40; 40... Connected by the material 45 is 1 by the mounting portion 7 so as to be the same as the length from the design connecting material 45 to the formwork surface 31 when installed on the formwork surface 31. The reinforcing bar positioning device 1 having a configuration in which each reinforcing bar mounting 5 is attached to the two mounting plates 3 and has the same length from the reinforcing bar mounting 5 to the one end 4t of the reinforcing bar positioning member 2 is the same. The above-mentioned interval a is used to install a plurality of upper reinforcing bars 39; 39. By setting it according to the interval b1; b2 (see FIG. 4, where b1 and b2 are set to the same length or different lengths), it is actually installed like the rebar 35 shown by the black circle in FIG. The pair of reinforcing bars 35; 35 are arranged on both sides of the lower arc surface portion 43 of the void 40 to be formed (both sides in the direction along the curved surface of the mold surface 31), and the central axes 41 of the respective voids 40; 40. ... Can be positioned at an equal distance from 41.
It should be noted that the length c2 of the connecting member 45 penetrating the upper arc surface portion 42 of the void 40 (that is, the interval between the adjacent reinforcing bars 35; 35 for entering the lower arc surface portion 43 of the void 40) is also the upper surface of the slab. It is determined according to the installation interval b2 of the upper reinforcing bars 39;
Therefore, it becomes possible to accurately form a regular square frame surrounded by the reinforcing bars 35 and 36 for entering the lower arc surface portion 43 of the void 40 using the reinforcing bar positioning device 1 of the embodiment. Accordingly, the curved surface slab whose weight is reduced by the void 40 can be easily and easily constructed as designed.

.. Are placed on the lower slab reinforcement 37, and then the lower rebar 38 that constitutes the upper slab reinforcement 37A above the plurality of voids 40; 40. The upper reinforcing bar 39 is arranged.
After completion of the bar arrangement work, concrete called fluid concrete having fluidity is placed on the formwork surface 31 to a predetermined level that can secure the concrete cover thickness.
Then, after the cast concrete has hardened, the mold 30 is removed. As a result, a curved surface slab is constructed in which the concrete surface in contact with the mold surface 31 is formed into a curved surface corresponding to the curved surface of the mold surface 31.

  That is, the curved surface slab construction method according to the embodiment uses the reinforcing bar positioning device 1 to form the form 30 of the form 30 having the form surface 31 in which one end of the plurality of reinforcing bar positioning members 2: 2. The flat plate surface of the mounting plate 3 of the reinforcing bar positioning device 1 is deformed into a curved surface parallel to the formwork surface 31 by being installed on the surface 31 and is provided at one end portion 4 of the plurality of reinforcing bar positioning members 2; Are placed on a curved surface parallel to the mold surface 31 and a plurality of reinforcing steel platforms 5; 5. A step of placing the reinforcing bars 35; 35, and a plurality of reinforcing bars so as to cross the plurality of reinforcing bars 35; 35 ... on the plurality of reinforcing bars 35; 36; 36 ... are arranged, and these upper and lower reinforcing bars 35; 36 ... The step of binding and forming the lower slab reinforcement 37, the step of supporting the lower slab reinforcement 37 on the formwork surface 31 using a reinforcing bar support tool not shown, and the lower slab reinforcement 37 using the reinforcement support tool. A step of removing the reinforcing bar positioning device 1 from the formwork surface 31 in a state of being supported by the lower arc, and a lower arc which is a lower end portion of the void 40 formed of a material having a unit volume weight lighter than concrete for forming the curved surface slab The void 40 is placed on the lower slab bar 37 so that the surface 43 fits into a rectangular frame surrounded by the upper and lower reinforcing bars 35; 36... Constituting the lower slab bar 37 and penetrates the rectangular frame. A step, a step of arranging the lower reinforcing bar 38 and the upper reinforcing bar 39 constituting the upper slab reinforcing bar 37A on the upper part of the plurality of voids 40; 40... And a step of constructing a curved surface slab in which the surface of the concrete in contact with the mold surface 31 of the mold 30 is formed into a curved surface by removing the mold 30 after the cast concrete is hardened. Therefore, the plurality of lower reinforcing bars 35 constituting the lower slab reinforcement 37 are easily separated at a distance along the curved surface forming the formwork surface 31 of the formwork 30 for constructing the curved slab. In addition, since the void 40 can be positioned on the mold surface 31 accurately, a curved surface slab whose weight is reduced by the void 40 can be easily constructed.

Further, according to the reinforcing bar positioning device 1 of the embodiment, the plurality of reinforcing bar positioning members 2; 2... Are arranged so as to be arranged at intervals along one direction perpendicular to the flat plate surface of the mounting plate 3. Since the other end portions 6 of the members 2; 2... Are fixed to the mounting plate 3, the flat plate surface of the mounting plate 3 of the reinforcing bar positioning device 1 can be obtained by installing one end of the plurality of reinforcing bar positioning members on the formwork surface 31. The curved surface parallel to the mold surface 31 is deformed into a curved surface parallel to the mold surface 31, and the reinforcing bar mounts 5; 5. Since it is located above, the direction along the curved surface forming the mold surface 31 of the mold 30 for constructing the curved surface slab by placing the reinforcing bars 35; 35. Can easily and easily position a plurality of reinforcing bars 35; It becomes so that.
Further, since the spring plate is used as the mounting plate 3, the flat plate surface of the mounting plate 3 is elastically deformed into a curved surface parallel to the mold surface 31 and can be used any number of times as long as it is used within the elastic deformation region. The positioning device 1 is obtained. The mounting plate 3 may not be a spring plate as long as it can be deformed into a curved surface parallel to the formwork surface 31.
Further, the plurality of reinforcing bar positioning members 2; 2... Are fixed to the mounting plate 3 at the other end portions 6; 6... So that the length from the flat plate surface of the mounting plate 3 to the one end 4t is the same. Since each of the reinforcing bar mountings 5; 5... Has the same length from one end 4t of each reinforcing bar positioning member 2; The distance between the reinforcing bars 35; 35... Positioned on the bases 5; 5... And the formwork surface 31 can be made equal, and the concrete cover thickness of the curved slab can be made uniform.
In addition, a regular square frame surrounded by the reinforcing bars 35 and 36 for allowing the lower arc surface portion 43 of the void 40 to enter can be accurately formed, and the void 40 can be accurately placed on the formwork surface 31. Therefore, the curved surface slab whose weight is reduced by the void 40 can be easily and easily constructed as designed.

  It should be noted that an installation member (not shown) with a large contact area in surface contact with the mold surface 31 is provided at the tips 4t; 4t of the plurality of reinforcing bar positioning members 2; If it is constituted so that it can stand on its own, installation work of the reinforcing bar positioning device 1 can be facilitated.

  Further, the reinforcing bar positioning member 2 may be configured such that the reinforcing bar mounting 5 is fixed to the bar 10 so as not to rotate, or the bar 10 and the reinforcing bar mounting 5 are integrally formed. In this case, the rebar positioning device 1 may be removed from the formwork surface 31 by rotating the bar 10 around the center axis of the bar 10 to remove the rebar mount 5 from the lower position of the rebar 35.

  The reinforcing bar positioning device 1 of the present invention is not only a mold surface 31 having a single arc surface, but also a composite in which a plurality of curved surfaces having a plurality of different curvatures that freely extend in any direction are combined. By using it for a mold surface having a curved surface, a plurality of reinforcing bars can be easily and easily positioned at intervals in a direction along the composite curved surface. That is, by using the reinforcing bar positioning device 1 of the present invention, it becomes possible to easily and easily position a plurality of reinforcing bars on a formwork surface having a complicated composite curved surface that is complicated in every direction, and a complicated curved surface slab. Will also be easy to build.

  Moreover, the reinforcing bar positioning device 1 of the present invention can be applied to the construction of curved slabs of walls, ceilings, and shell structures.

1 rebar positioning device, 2 rebar positioning member, 3 mounting plate, 4 end,
5 Reinforcement stand, 6 other end, 30 mold, 31 mold surface, 35 rebar.

Claims (5)

A plurality of reinforcing bar positioning members having a reinforcing bar mounting at one end, and a mounting plate,
The other end portions of the plurality of reinforcing bar positioning members are fixed to the mounting plate so that the plurality of reinforcing bar positioning members are arranged at intervals along one direction perpendicular to the flat plate surface of the mounting plate. Rebar positioning device.   The reinforcing bar positioning device according to claim 1, wherein the mounting plate is a spring plate.   Each of the reinforcing bar positioning members is fixed to the mounting plate so that the length from the flat surface of the mounting plate to the one end is the same, and the length from the reinforcing bar mounting to one end of the reinforcing bar positioning member The reinforcing bar positioning device according to claim 1, further comprising a reinforcing bar mount so as to be the same. Using the reinforcing bar positioning device according to any one of claims 1 to 3,
The flat plate surface of the mounting plate of the reinforcing bar positioning device is transformed into a curved surface parallel to the mold frame surface by installing one end of a plurality of reinforcing bar positioning members on the mold frame surface of the mold frame having a curved mold surface. A step of positioning each reinforcing bar mounting provided on one end of the plurality of reinforcing bar positioning members on a curved surface parallel to the formwork surface;
Placing each reinforcing bar on a plurality of reinforcing bar platforms positioned on a curved surface parallel to the formwork surface;
Arranging a plurality of reinforcing bars on the plurality of reinforcing bars placed on the plurality of reinforcing steel bars so as to intersect with the reinforcing bars, and binding the upper and lower reinforcing bars to form a lower slab; ,
Supporting the lower slab rebar on the formwork surface using a reinforcing bar support;
Removing the reinforcing bar positioning device from the formwork surface in a state where the lower slab rebar is supported on the formwork surface by the reinforcing bar support;
Arranging the upper slab muscle above the lower slab muscle;
Placing concrete on the formwork after bar arrangement,
A curved surface slab construction method comprising: a step of constructing a curved surface slab in which a concrete surface that is in contact with a mold surface is formed into a curved surface by removing the mold frame after hardening of the placed concrete .   Install the void on the lower slab bar so that the lower end of the void formed of a material with a lighter unit volume weight than concrete fits into the rectangular frame surrounded by the upper and lower reinforcing bars constituting the lower slab bar 5. The curved surface slab construction method according to claim 4, further comprising steps.

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