JP7349874B2 - formwork support structure - Google Patents

Description

The present invention relates to a formwork support structure that supports a formwork.

During construction of concrete members, separators are used to support the formwork for concrete pouring and to resist concrete pouring pressure. Usually, a separator is arranged so as to connect a pair of formworks at positions sandwiching a concrete member (see Patent Document 1, etc.).

However, when constructing a large-area concrete member such as a bottom slab, the distance between the formworks that sandwich the concrete member becomes wide, and it is difficult to connect these formworks with separators.

Therefore, in such cases, metal fittings such as guts are attached to the reinforcing bars assembled inside the formwork and the separators are welded to the metal fittings, or the separators are welded to setup bars inside the formwork. This is because separators cannot be directly welded to reinforcing bars used as structural bars. Further, Patent Document 2 describes that a separator receiving member is provided on an anchor extending inward from a cylindrical wall, and an inner formwork placed inside the wall is supported by a separator attached to the separator receiving member. There is.

Japanese Patent Application Publication No. 11-269893 Japanese Patent Application Publication No. 2012-31602

However, in the conventional method, it is necessary to separately attach metal fittings such as guts to the reinforcing bars and arrange setup bars after the reinforcing bars are placed in the formwork, which makes the work difficult and time-consuming. Patent Documents 1 and 2 also require separate members for arranging and attaching the separators, and there is a similar problem.

In addition, when attaching separators to guts etc. by welding, there are problems such as the welding work is time-consuming, the operator requires qualifications, equipment such as a welding machine and electric power is required, and work may be impossible due to weather. There is also.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a formwork support structure etc. with high workability.

A first invention for solving the above-mentioned problems is that when a bottom slab is constructed with concrete, a separator is provided at a position corresponding to the end of one side of the bottom slab, and a separator is provided at a position corresponding to the end of one side of the bottom slab to prevent the shape of the one side during concrete pouring. A formwork support structure that supports only the frame, wherein an end of the separator opposite to the formwork is attached to a separator attachment part fixed to a reinforcing bar inside the formwork, and the separator attachment part is , the mold includes a support member for supporting reinforcing bars, the reinforcing bars are arranged vertically inside the formwork, and the supporting member is a reinforcing bar frame that maintains an interval between the upper and lower reinforcing bars. It is a frame support structure.
A second invention provides a formwork support that is provided at a position corresponding to the end of one side of the bottom plate when constructing the bottom plate with concrete, and supports only the formwork on the one side during concrete pouring by means of a separator. In the structure, an end of the separator opposite to the formwork is attached to a separator attachment part fixed to reinforcing bars inside the formwork, and the separator attachment part has a support member for supporting the reinforcing bars. The formwork support structure is characterized in that the support member has a frame-like vertical surface and is arranged perpendicular to the formwork surface.
A third invention is a formwork support structure in which a separator supports a formwork during concrete pouring, wherein an end of the separator opposite to the formwork is fixed to a reinforcing bar inside the formwork. The separator mounting portion includes a support member for supporting reinforcing bars, a plurality of the support members are arranged in a horizontal direction parallel to the formwork surface, and the separator mounting portion is attached to the formwork surface. The formwork support structure has separator attachment members extending in parallel directions and attached to the plurality of support members, and the ends of the separators are attached to the separator attachment members.
A fourth invention is a formwork support structure in which a separator supports a formwork during concrete pouring, wherein an end of the separator opposite to the formwork is fixed to a reinforcing bar inside the formwork. The separator mounting portion includes a support member for supporting reinforcing bars, and the separator mounting portion has a formwork surface for passing the end portion when installing the separator. This is a formwork support structure characterized by having a slit in a direction parallel to the slit.

In this embodiment, a support member for supporting reinforcing bars is also used as a separator attachment part, and this is fixed to the reinforcing bars inside the formwork to absorb the reaction force when supporting the formwork with the separator. This eliminates the need to separately attach metal fittings such as guts to reinforcing bars or arrange setup bars, improving workability when constructing large-area concrete components such as bottom slabs.

In the first invention , the reinforcing bars are arranged one above the other inside the formwork, and the supporting member is a reinforcing bar frame that maintains an interval between the upper and lower reinforcing bars.
In a bottom plate or the like, reinforcing bars are arranged above and below as structural bars, but in the present invention, a reinforcing bar frame that maintains the interval between the upper and lower reinforcing bars can be used as a separator attachment part.

In the second aspect of the invention, the support member has a frame-like vertical surface and is arranged perpendicular to the mold surface .
This improves the rigidity of the support member and improves its resistance to concrete placement pressure.

It is preferable that the separator attachment part includes a nut that is screwed into the end of the separator.
This eliminates the need for welding the separator, and solves the above-mentioned problems during welding.

In the third invention, since the separator can be mounted by selecting a position on the separator mounting material, the position of the separator can be easily adjusted according to the arrangement of the formwork or reinforcing bars.

It is preferable that the reinforcing bars are deformed reinforcing bars, and that the supporting member is fixed to the deformed reinforcing bars in a direction perpendicular to the formwork surface using U-shaped bolts.
Thereby, the position of the support member in the direction orthogonal to the formwork surface can be firmly fixed, and the resistance to concrete placement pressure is improved.

Further, in the fourth invention, the position of the separator can be easily adjusted according to the arrangement of the formwork or reinforcing bars, and workability is improved.

According to the present invention, it is possible to provide a formwork support structure and the like with high workability.

The figure which shows formwork support structure 1. FIG. 3 is a view of the part where the horizontal member 111 is fixed to the reinforcing bar 5; A diagram showing a concrete placement method. A diagram showing a reinforcing bar frame 11a. FIG. 1 is a diagram showing a formwork support structure 10; Examples of reinforcing bars 11b, 11c, and 11d. A diagram showing a formwork support structure 100. The figure which shows formwork support structure 100a, 100b.

Hereinafter, preferred embodiments of the present invention will be described in detail based on the drawings.

[First embodiment]
FIG. 1 is a diagram showing a formwork support structure 1 according to a first embodiment of the present invention. The formwork support structure 1 is used when constructing a large-area concrete member such as a bottom slab, and supports the formwork 3 during concrete pouring using a separator 41. In particular, in this embodiment, the reinforcing bar frame 11 is used as a separator mounting portion, and the end portion 411 of the separator 41 on the side opposite to the formwork 3 is attached to the reinforcing bar frame 11.

The reinforcing bar frame 11 is a support member for supporting the reinforcing bars, and is used as a mount when placing the reinforcing bars 5, which are structural bars of the concrete member, inside the formwork 3 (corresponding to the left side of the formwork 3 in FIG. 1). .

The reinforcing bar frame 11 is configured in a rectangular shape by providing vertical members 112 between both ends of upper and lower horizontal members 111, and has a frame-shaped vertical surface. Although angle materials are used for the horizontal material 111 and the vertical material 112, they are not limited to this. The reinforcing bar frame 11 is arranged so that the vertical plane of the frame is perpendicular to the form surface, and diagonal members 113 are provided to connect the corners of the vertical plane. For example, a plate material is used for the diagonal member 113, but the present invention is not limited to this, and an angle material or the like may be used.

Two upper and lower nuts 114 (long nuts) are fixed in advance to the vertical member 112 on the formwork 3 side of the reinforcing bar frame 11 by welding or the like. An end 411 of the separator 41 opposite to the formwork 3 is threaded, and the end 411 is inserted into the nut 114 and screwed together. A P-con 42 is provided at the opposite end, and the formwork 3 is attached to the tip of the P-con 42.

In this embodiment, reinforcing bars 5 are arranged above and below inside the formwork 3. The reinforcing bars 5 include reinforcing bars 51 in a direction perpendicular to the formwork surface (corresponding to the left-right direction in FIG. 1) and reinforcing bars 52 in a direction perpendicular to this on the plane (corresponding to the normal direction to the paper surface in FIG. 1). . The reinforcing bars 51 in the upper and lower stages are connected at the ends on the formwork 3 side. Deformed reinforcing bars are used for the reinforcing bars 51 and 52.

The reinforcing bar frame 11 is used to maintain the interval between the upper and lower reinforcing bars 5, and the upper and lower horizontal members 111 of the reinforcing bar frame 11 are fixed to the upper and lower reinforcing bars 51, respectively, by the jig 7. Note that the lower reinforcing bars 5 are placed so as to be lifted from the concrete placement surface 2 by spacers 6. The concrete pouring surface 2 is, for example, a leveled concrete surface, but there are also cases where concrete is poured directly onto the ground surface.

FIG. 2 is a view showing a portion of the horizontal member 111 fixed to the reinforcing bar 5, and in this embodiment, a U-shaped bolt 71 is used as the jig 7. The horizontal member 111 is fixed to the reinforcing bar 51 by passing the reinforcing bar 51 inside the U-shaped bolt 71, passing both threaded ends of the U-shaped bolt 71 through the horizontal surface of the horizontal member 111, and tightening the nut 72 at the tip. be done.

Since the reinforcing bars 51 are deformed reinforcing bars having ribs on the outer periphery, by fixing the horizontal members 111 to the reinforcing bars 51 using the U-shaped bolts 71 as described above, the reinforcing bar mount 11 is aligned in the axial direction of the reinforcing bars 51, that is, the shape of the reinforcing bars 51. It does not move in the direction perpendicular to the frame surface, improving the resistance to concrete placement pressure. Although FIG. 2 shows an example of the fixing portion of the lower horizontal member 111 of the reinforcing bar frame 11, the upper horizontal member 111 is similarly fixed to the reinforcing bar 51. The number of fixing points using the U-shaped bolts 71 is adjusted in consideration of the concrete placement pressure applied to the formwork 3 so as to obtain an appropriate resistance force.

FIG. 3 is a diagram showing a concrete placing method using the formwork support structure 1 of this embodiment.

In this embodiment, as shown in FIG. 3A, the reinforcing bars 5, spacers 6, and reinforcing bar frame 11 are arranged as described above, and the upper and lower reinforcing bars 5 are provided at predetermined intervals by the reinforcing bar frame 11. Then, as shown in FIG. 3(b), the end portion 411 of the separator 41 is screwed into the nut 114, and the P connector 42 is provided at the opposite end, and the formwork 3 is attached to the tip thereof.

Thereafter, concrete members such as the bottom slab are constructed by pouring concrete 4 inside the formwork 3 as shown in FIG. 3(c). The pouring pressure of the concrete 4 applied to the formwork 3 is supported by the separator 41, and its reaction force is received by the reinforcing bar frame 11 fixed to the reinforcing bars 5.

As explained above, in this embodiment, the reinforcing bar frame 11 is also used as a separator attachment part, and this is fixed to the reinforcing bars 5 inside the formwork 3 to reduce the reaction force when the formwork 3 is supported by the separator 41. This eliminates the need for separately attaching metal fittings such as guts to the reinforcing bars 5 or arranging setup bars, and improves workability when constructing large-area concrete members such as bottom slabs.

Further, reinforcing bars 5 are arranged above and below as structural bars in the bottom plate, etc., but in this embodiment, the reinforcing bar frame 11 that maintains the interval between the upper and lower reinforcing bars 5 can be used as a separator attachment part.

Further, since the reinforcing bar mount 11 has a frame-shaped vertical surface and is arranged perpendicular to the formwork surface, the rigidity of the reinforcing bar mount 11 is improved, and its resistance to concrete placement pressure is improved.

Further, since the reinforcing bar frame 11 is provided with a nut 114 that is screwed into the end portion 411 of the separator 41, welding of the separator 41 becomes unnecessary, and the above-mentioned problems during welding are solved.

In addition, since the reinforcing bar mount 11 is fixed to the deformed reinforcing bars (reinforcing bars 51) in the direction perpendicular to the formwork surface using U-shaped bolts 71, the position of the reinforcing bar mount 11 in the direction perpendicular to the formwork surface is firmly fixed. , the resistance to concrete placement pressure is improved.

However, the present invention is not limited to the above embodiments. For example, the configuration of the reinforcing bar frame 11 is not particularly limited, and reinforcing bars or the like may be used as the horizontal member 111. Further, the reinforcing bar frame is not limited to a frame-like structure having a horizontal member 111 and a vertical member 112, and may be a column-shaped structure as shown in the reinforcing bar frame 11a in FIG. 4.

The reinforcing bar frame 11a in FIG. 4 is configured by providing a set-up bar 115 at the bottom of a vertical member 112, and providing a receiving member 116 at the top of the vertical member 112 for supporting the upper reinforcing bar 5. The reinforcing bar frame 11a is arranged such that the setup bars 115 are fixed to the lower reinforcing bars 5 by bundling or the like, and nuts 114 are fixed to the vertical member 112 in two stages, upper and lower, by welding or the like, as described above. The upper reinforcing bars 5 are attached to the setup bars, for example, after placing the setup bars on the receiving material 116.

Hereinafter, other examples of the present invention will be described as second and third embodiments. The second and third embodiments will be described with respect to points that are different from the embodiments described up to that point, and similar points will be designated with the same reference numerals in the figures and the like, and description thereof will be omitted. Moreover, the configurations described in each embodiment, including the first embodiment, can be used in combination as necessary.

[Second embodiment]
FIG. 5(a) is a diagram showing a formwork support structure 10 according to a second embodiment of the present invention. The second embodiment differs from the first embodiment in the configuration of the separator attachment portion.

That is, in this embodiment, a plurality of reinforcing bars 11 are arranged in a horizontal direction parallel to the form surface. A horizontal member 12 extending in a direction parallel to the formwork surface is attached across the plurality of reinforcing bars 11, and these reinforcing bars 11 and horizontal members 12 constitute a separator attachment portion.

For the horizontal member 12, a steel material such as an angle member is used, for example. The horizontal members 12 are attached to the vertical members 112 on the formwork 3 side of each reinforcing bar frame 11 in two stages, upper and lower, by welding or the like.

The horizontal member 12 has a function as a separator attachment member for attaching an end portion 411 of the separator 41, and the end portion 411 is welded to the horizontal surface of the horizontal member 12. Reference numeral 8 indicates this welded portion. The end portion 411 of the separator 41 may be plate-shaped to facilitate welding.

In this embodiment, the end portion 411 of the separator 41 can be attached by selecting a position in the extending direction of the horizontal member 12, so that the position of the separator 41 can be easily adjusted according to the arrangement of the formwork 3 or reinforcing bars 5.

Furthermore, as shown in FIG. 5(b), depending on the axial position of the separator 41 to be welded, the position of the separator 41 in the direction perpendicular to the form surface (corresponding to the left-right direction in FIG. 5(b)) Adjustment is also easy, and adjustment can be made according to the distance between the reinforcing bar frame 11 and the formwork 3. Note that in the first embodiment as well, if the separator 41 is rotated around the axis, the separator 41 moves forward and backward relative to the nut 114, so the position of the separator 41 in the direction perpendicular to the mold surface can be easily adjusted.

Further, although the reinforcing bars 5, the jig 7, etc. are not shown in FIG. 5 for the sake of explanation, the reinforcing bar mount 11 can be fixed to the reinforcing bars 5 using the same jig 7 as in the first embodiment. Further, in this embodiment, the end portion 411 of the separator 41 is welded to the horizontal member 12, but depending on the case, it is also possible to bond with an adhesive or the like, and the end portion 411 is attached to the horizontal surface of the horizontal member 12 with a screw. It is also possible to use mechanical means such as pressing down.

Further, the structure of the reinforcing bar frame 11 is not particularly limited, and for example, when considering the diagonal member 113, it may be provided only in the lower half of the reinforcing bar frame 11b as shown in FIG. 6(a), or as shown in FIG. 6(b). The upper and lower halves of the reinforcing bar frame 11c can also be arranged in a V-shape. Moreover, instead of the diagonal member 113, it is also possible to use a horizontal member 113a as shown in the reinforcing bar frame 11d in FIG. 6(c). The above is the same in the first embodiment and the third embodiment described later.

[Third embodiment]
Next, as a third embodiment, an example of another formwork support structure that facilitates position adjustment of the separator 41 will be described.

FIG. 7 is a diagram showing a part of the formwork support structure 100 according to the third embodiment. In this embodiment, a pair of reinforcing bars 11, which are separator attachment parts, are arranged so that the vertical surfaces of the vertical members 112 are back to back, and a vertical slit parallel to the formwork surface is formed between both the vertical members 112. S is formed. The end 411 of the separator 41 is passed through the slit S.

Nuts 118 are fixed to the ends of both vertical members 112 opposite to the formwork 3 by welding or the like, and the ends 411 of the separator 41 are screwed into these nuts 118. In this embodiment, by selecting the fixing position of the nut 118 along the slit S as shown by the dotted line in the figure, it becomes easy to adjust the position of the separator 41 in the vertical direction.

In addition, in the formwork support structure 100a of FIG. 8(a), a plurality of reinforcing bars 11 are arranged in a horizontal direction parallel to the formwork surface, and a plurality of upper and lower horizontal members 12 extending in a direction parallel to the formwork surface are arranged. These reinforcing bars 11 and horizontal members 12 constitute a separator mounting section.

The upper and lower horizontal members 12 are arranged with their horizontal surfaces facing each other, and a horizontal slit S parallel to the form surface is formed between both horizontal members 12. Similar to the second embodiment, this horizontal member 12 has a function as a separator attachment member for attaching the separator 41. That is, a nut 121 is fixed to the opposite end of the horizontal member 12 from the formwork 3 by welding or the like, and the end 411 of the separator 41 is passed through the slit S and screwed into the nut 121. . In this example as well, by selecting the fixing position of the nut 121 along the slit S, it becomes easy to adjust the position of the separator 41 in the horizontal direction (parallel to the form surface).

Further, in the example of FIG. 8(a), a vertical elongated hole 117 is provided in the vertical member 112 on the formwork 3 side of the reinforcing bar frame 11, and the shaft portion 122 of the headed bolt passed through this elongated hole 117 is inserted into the horizontal member. The horizontal member 12 is attached to the vertical member 112 by passing it through the vertical surface of the member 12 and tightening a nut 123 at its tip. By loosening the nut 123, the height of the horizontal member 12 can be changed, and thereby the vertical position of the separator 41 can also be easily adjusted.

The formwork support structure 100b in FIG. 8(b) has a cantilevered angle member 13 extending in a direction parallel to the formwork surface on the vertical member 112 of the reinforcing bar frame 11 on the formwork 3 side, The reinforcing bar frame 11 and the angle member 13 constitute a separator mounting portion.

A slit S (elongated hole) is provided in the vertical surface of the angle material 13 in a direction parallel to the formwork surface along the extending direction of the angle material 13. Similar to the above, this angle member 13 has a function as a separator attachment member for attaching the separator 41. That is, a nut 131 is fixed to the end of the angle member 13 opposite to the formwork 3 by welding or the like, and the end 411 of the separator 41 is passed through the slit S and screwed into the nut 131.

Also in this example, the angle member 13 is attached to the vertical member 112 by passing the shaft portion 132 of the headed bolt through the vertical surfaces of the vertical member 112 and the angle member 13, and tightening the nut 133 at the tip thereof. Therefore, by loosening the nut 133, the angle member 13 can be rotated in a plane parallel to the form surface. Therefore, in the formwork support structure 100b, by selecting the fixing position of the nut 131 along the slit S and rotating the angle member 13 in a plane parallel to the formwork surface, the separator in the plane parallel to the formwork surface is fixed. 41 becomes easy to adjust.

Although preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to such examples. It is clear that those skilled in the art can come up with various changes or modifications within the scope of the technical idea disclosed in this application, and these naturally fall within the technical scope of the present invention. Understood.

1, 10, 100, 100a, 100b: Formwork support structure 3: Formwork 4: Concrete 5, 51, 52: Reinforcement bar 7: Jig 11, 11a, 11b, 11c, 11d: Reinforcement frame 12: Horizontal material 13: Angle material 41: Separator 71: U-shaped bolts 72, 114, 118, 121, 131: Nut S: Slit

Claims (6)

When constructing a bottom slab with concrete, a formwork support structure is provided at a position corresponding to the end of one side of the bottom slab, and supports only the formwork on the one side during concrete pouring with a separator,
An end of the separator opposite to the formwork is attached to a separator attachment part fixed to a reinforcing bar inside the formwork,
The separator attachment part includes a support member for supporting reinforcing bars,
The reinforcing bars are arranged one above the other inside the formwork,
The formwork support structure is characterized in that the support member is a reinforcing bar frame that maintains an interval between the upper and lower reinforcing bars . When constructing a bottom slab with concrete, a formwork support structure is provided at a position corresponding to the end of one side of the bottom slab, and supports only the formwork on the one side during concrete pouring with a separator,
An end of the separator opposite to the formwork is attached to a separator attachment part fixed to a reinforcing bar inside the formwork,
The separator attachment part includes a support member for supporting reinforcing bars,
A formwork support structure , wherein the support member has a frame-like vertical surface and is arranged perpendicular to the formwork surface . A formwork support structure that supports formwork during concrete pouring with a separator,
An end of the separator opposite to the formwork is attached to a separator attachment part fixed to a reinforcing bar inside the formwork,
The separator attachment part includes a support member for supporting reinforcing bars,
A plurality of the supporting members are arranged in a horizontal direction parallel to the formwork surface,
The separator attachment part has a separator attachment member that extends in a direction parallel to the mold surface and is attached to the plurality of support members,
The formwork support structure, wherein the end portion of the separator is attached to the separator attachment member. A formwork support structure that supports formwork during concrete pouring with a separator,
An end of the separator opposite to the formwork is attached to a separator attachment part fixed to a reinforcing bar inside the formwork,
The separator attachment part includes a support member for supporting reinforcing bars,
The formwork support structure is characterized in that the separator attachment part has a slit in a direction parallel to the formwork surface through which the end part of the separator is passed when the end part is attached. The formwork support structure according to any one of claims 1 to 4 , wherein the separator attachment part has a nut that screws into the end part of the separator. The reinforcing bars are deformed reinforcing bars,
The formwork support structure according to any one of claims 1 to 5 , wherein the support member is fixed to the deformed reinforcing bar in a direction perpendicular to the formwork surface with a U-shaped bolt.

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