JP2015105552A - Form support tool and slab construction method using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a form support tool which has a simple structure and can facilitate erection work and decomposition work of H-shaped steel to/from a beam, and surely and stably support a concrete form, and a slab construction method using the same.SOLUTION: A form support tool 1 which supports a concrete form 22 between beams 21 such as H-shaped steel consists of a long square bar 2 in which, in the state where a part of an upper surface is brought into pressure contact with a lower surface of a flange 21a on the upper side of the beam 21, the concrete form 22 is placed on another part of the upper surface, and a bearing body 3 which is formed independently of the square bar 2, interposed between the lower surface of the square bar 2 and the upper surface of the flange 21b on the lower side of the beam 21 to apply push-up force for pushing up the square bar 2 and freely expandable/contractable in the vertical direction.

Description

  The present invention relates to a formwork support suitable for supporting a formwork used when constructing a concrete slab that functions as a floor or ceiling of a building, and a concrete slab construction method using the same.

  Conventionally, as a method of constructing a concrete slab that functions as a floor or ceiling of a building, a steel formwork such as a deck plate or a flat deck is arranged in the concrete slab formation planned area, and the plan formed by this formwork. A method in which concrete is poured into a region (placed) and solidified is frequently used (see, for example, Patent Document 1). Compared to the previous case where wooden plywood is used as a formwork, this steel formwork is a column (support work) that is erected to reach the placement position of the formwork from the existing lower floor to support the formwork. ) Can be made unnecessary, or even when the span between beams is long, the number of support works can be greatly reduced, and the construction period can be shortened and the cost can be reduced.

  However, when this steel formwork is applied to a building having a beam such as an H-shaped steel such as a steel structure, it is common to weld and fix the formwork to the beam from the viewpoint of preventing collapse. Even after the slab has been formed, the steel formwork such as the flat deck cannot be removed and remains as a part of the building (discarded formwork method). Therefore, the materials and resources of the steel formwork cannot be reused and are wasted, and there are also problems such as the appearance failure due to rusting of the remaining steel deck.

  On the other hand, a steel formwork with variable deck length called “slide deck” has been developed that can be applied even on the site where the spans of beams are different, assuming that they are repeatedly reused in steel forms ( Patent Document 1). However, since this slide deck is supposed to be used repeatedly, the fixing method by welding cannot be applied to a general steel structure building.

  As countermeasures for these, instead of deck fixing by welding, for example, as shown in Patent Documents 2, 3, and 4, the beam of a beam composed of H-shaped steel having a pair of flanges arranged to face each other vertically It has also been proposed to support a mold with a mold support attached between a pair of flanges. According to the fixing method of the formwork using the formwork support of Patent Documents 2, 3, and 4, the formwork can be removed after the slab construction, and the deck plate and the flat deck can be reused repeatedly. .

JP 2006-46002 A Japanese Patent Laid-Open No. 01-268967 Japanese Utility Model Publication No. 05-067750 Japanese Utility Model Publication No. 50-039028

  However, Patent Documents 2, 3, and 4 have the following problems.

  According to the formwork support described in Patent Document 2, a pair of upper and lower flanges of the beam is obtained by extending a support rod that supports a beam material as a formwork on a beam such as H-shaped steel in an up-and-down direction. It is formed so as to be fixed between them. However, it is necessary to provide the telescopic rods at both ends of the mold support (both ends in the longitudinal direction of the flange) (necessary to provide a pair), the structure is complicated, and the pair of telescopic rods are expanded and contracted. There was an inconvenience that the work was time-consuming. Also, since the end of the formwork is inserted between the flange on the upper side of the beam and the support plate of the formwork support, the formwork end is inserted and fixed in a complicated manner. There was an inconvenience of becoming.

  Moreover, according to the formwork support tool described in Patent Document 3, as a fitting jig for supporting a deck plate as a formwork, a long prismatic receiving material and its lower surface project at predetermined intervals. A plurality of pedestal pillars, and a wedge-shaped camber is driven horizontally between the lower flange of the beam and the lower surface of each pedestal to cause the fitting jig to move between the upper and lower flanges of the beam. I am trying to fix with. However, since this fitting jig is formed by projecting a plurality of pedestals at predetermined intervals on the lower surface of a long receiving material, the work of carrying in and out of the installation site becomes complicated, Since the wedge-shaped camber is driven, each pedestal may receive a lateral component force in addition to the upward component force of the wedge force and move laterally, so that the fitting jig is properly attached to the beam. And the mounting state becomes unstable, and further, it is difficult to pull out the camber when disassembling the formwork support after slab construction. Moreover, since the length of the pedestal is not variable, it is necessary to prepare various formwork supports according to the dimensions for each H-shaped steel to be applied.

  Further, according to the formwork support described in Patent Document 4, a support provided with an arm piece for supporting a square member is inserted between a pair of upper and lower flanges of a beam such as H-shaped steel, and rotates a screw rod and a nut. Thus, the length of the support is extended and fixed between the flanges. The square bar is supported in a state parallel to the beam and a little apart from the beam, and the formwork is placed on the square bar. However, the square bar is mounted on the U-shaped notch provided on the arm piece and is not fixed, so that it may move in a direction parallel to the beam and is unstable. In addition, since an eccentric load is applied to the arm piece, there is a problem that the structure is complicated such as attaching a rotatable upper end metal fitting, and the workability of fixing the support is inferior.

  The present invention has been made in view of these points, has a simple structure, can be easily erected and disassembled to a beam such as an H-shaped steel, and the mold can be reliably and stably formed. It is an object of the present invention to provide a mold support that can be supported and a slab construction method using the same.

  In order to solve the above-mentioned problems, a formwork support according to a first aspect of the present invention is a formwork support that supports a formwork between beams such as H-shaped steel, and includes an upper flange of the beam. A long square member on which the mold is placed on the other part of the upper surface in a state where a part of the upper surface is pressed against the lower surface of the square member is formed separately from the square member, and the lower surface of the square member And a support body that is interposed between the upper surface of the flange on the lower side of the beam and that is capable of expanding and contracting in the vertical direction for applying a lifting force for pushing up the square member.

  Further, the formwork support of the second aspect is a formwork support that supports the formwork between beams such as H-shaped steel, and a part of the upper surface is pressed against the lower surface of the upper flange of the beam. In this state, a long square member on which the formwork is placed on the other part of the upper surface, and a lower surface of the square member and an upper surface of the lower flange of the beam. And a support body that is vertically expandable and contractable to apply a lifting force for pushing up the square member.

  Further, the form support of the third aspect is the form support of the first or second aspect, wherein the support body is movable in the vertical direction, and the movable body is moved in the vertical direction. And a vertical drive mechanism.

  Further, the mold support of the fourth aspect is the mold support of the third aspect, wherein the vertical drive mechanism is a screw mechanism or an air cylinder mechanism that moves the movable body in the vertical direction. Features.

  Further, the form supporter of the fifth aspect is the formwork support part of any one of the first to fourth aspects, wherein the support body has a top plate on which the square member is placed at the upper end and the lower part at the lower end. And a base plate placed on a flange on the side, wherein both the plates have an inclined surface at an insertion side end in a direction perpendicular to the longitudinal direction of the flange.

  Moreover, the slab construction method using the formwork support tool according to the first aspect includes fixing a square member to the beam using the formwork support formwork support tool according to any one of the first to fifth aspects, The concrete is placed in the slab forming region formed by placing the mold on the other part of the upper surface of the square member fixed to the slab, and the concrete is solidified to form the slab. It is characterized by removing.

  Moreover, the slab construction method using the formwork support tool of the second aspect is a steel flat deck in which the formwork is fixed in length, and this flat deck is used for slab formation over a multi-story floor of one building. It is characterized by being repeatedly used.

  Moreover, the slab construction method using the formwork support tool according to the third aspect is a steel slide deck in which the formwork is variable in length, and this slide deck is formed into a slab for a steel structure or a steel reinforced concrete structure. It is characterized by being repeatedly used.

  According to the slab construction method of each aspect using the formwork support of each aspect of the present invention, the square member is placed between the upper and lower flanges of the beam of H-shaped steel or the like with the support body contracted. After that, the length of the support body is extended and the square bar is pushed up, and a part of the upper surface of the square bar is pressed against and fixed to the lower surface of the upper flange. It becomes possible to place the end of the mold on the other part. Then, the slab can be constructed by placing concrete in the slab formation area. After that, by shortening the length of the support body, the mold support and the mold can be disassembled and removed. The formwork support of the present invention is one same formwork support and can be applied to a wide size range of H-shaped steel and square bars. As described above, the formwork support of the present invention and the slab construction method using the same have a simple overall structure including the formwork support, and facilitate the construction work and the disassembly work on the beam such as H-shaped steel. It is possible to achieve excellent effects such as that the mold can be supported reliably and stably.

  In addition, it is possible to repeatedly use the same deck multiple times for a fixed-size flat deck that has been used as a single-use frame in the steel structure so far, and to effectively use materials and resources. it can. In particular, in the slab construction over a multi-story floor of one building, the slab construction method using the formwork support tool of the present invention is effective because the number of decks carried into the site can be greatly reduced.

  In addition to steel slabs, such as slide decks, which are premised on repeated use, they are applicable not only to conventional slab construction with reinforced concrete structures, but also to slab construction of steel structures with beams such as H-shaped steel and structures with steel reinforced concrete structures. The range can be expanded.

  Furthermore, since steel forms such as flat decks can be finally removed from the building after repeated use, it is also possible to sell and recycle used steel forms as steel scrap. For the contractor who performs the construction, there is an advantage that a part of the deck purchase cost can be recovered.

The partially cut front view which shows the slab construction state which shows one Embodiment of the formwork support tool of this invention FIG. 1 is a partially cut right side view of the formwork support of FIG. 1 is a perspective view of the main part of FIG. (A) Front view which shows other embodiment of the formwork support tool of this invention, (b) The right view of (a), (c) The top view of a rotation plate

  Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS.

  1 to 3 show an embodiment of a formwork support according to the present invention.

  1 and 2 show a state in which a known mold 22 made of a flat deck, a slide deck or the like is installed on a beam 21 made of H-shaped steel using the mold support 1 of the present embodiment. . This formwork 22 is a steel deck plate for floor formwork, which is an alternative to the conventional plywood formwork, and has a plate thickness of 0.8 to 0.8 that is used when casting concrete such as building floors and roof slabs. It is a form material made of a thin steel plate of about 1.6 mm. The flat deck is preferably a steel flat deck with a fixed length, a deck plate with a flat top surface that serves as a temporary floor surface, and a slide deck with a variable length steel slide may be used. It is a deck plate whose combination length can be adjusted so that two plates partially overlap.

  The formwork support 1 of the present invention includes only the support body 3 among the square member 2 and the support body 3 that are interposed as upper and lower parts separately between the upper flange 21a and the lower flange 21b of the beam 21. May be used as the formwork support 1a, and the square support 2 and the support body 3 may be combined to form the formwork support 1b.

  One square member 2 has a long shape having a predetermined square cross section, and a part of the upper surface (about half of one side of the square cross section) is pressed against the lower surface of the upper flange 21a of the beam 21. Parallel to the beam 21, it is interposed between both flanges 21a and 21b. Although it does not specifically limit as a raw material of the square material 2, It is good to set it as a wooden. In the case of a wooden square, the mold 22 can be easily fixed to the square 2 with a nail, a screw nail 14 or the like. Further, by removing the nail, the screw nail 14 and the like after the slab is formed, the square member 2 and the mold 22 can be easily separated.

  The other support body 3 is made of metal such as metal plated with steel or stainless steel, and is formed separately from the square member 2, and the lower surface of the square member 2 and the upper surface of the flange 21 b below the beam 21. Is formed so as to be able to expand and contract in the vertical direction so as to apply a push-up force for pushing up the square member 2.

  The support body 3 will be further described. The support body 3 has a movable body 4 that is movable in the vertical direction and a screw mechanism 5 as a vertical drive mechanism that moves the movable body 4 in the vertical direction. One screw mechanism 5 is formed by screwing a nut 8 to a column bolt 7 fixed so as to extend vertically upward mainly to a base plate 6 placed on a lower flange 21b. A substantially cross-shaped rotating plate 9 used for rotating the nut 8 is fixed to the lower end portion of the nut 8. The other movable body 4 is fixed so as to extend vertically downward from a top plate 10 mainly pressed against the lower surface of the square member 2 and is supported on the outer side of the upper part of the support bolt 7. The reinforcing pipe 12 is welded to the support pipe 11 and the top plate 10. Since the support pipe 11 is mounted on the support bolt 7, the rotation of the top plate 10 is prevented when the nut 8 is rotated. Both base plates 6 and top plate 10 are provided with inclined surfaces 6a, 10a by bending the insertion side end portions in order to facilitate insertion in the direction perpendicular to the longitudinal direction of flanges 21a, 21b.

  Next, the slab construction method according to this embodiment will be described.

  First, the mold 22 is held in a state where a part of the upper surface of the square member 2 is in contact with the lower surface of the upper flange 21a of the beam 21 to be installed, and the nut 8 of the screw mechanism 5 of the mold support 1 is rotated. In a state where the distance between the base plate 6 and the top plate 10 is adjusted to be smaller than the distance between the upper surface of the lower flange 21b and the lower surface of the square member 2, the both base plates 6 and the top plate 10 are arranged in the longitudinal direction of the flanges 21a and 21b. Each inclined surface 6 a is inserted from the direction orthogonal to the front side 10 a and the square member 2 is placed on the top plate 10. At this time, the base plate 6 may be inserted to a predetermined position by, for example, abutting a stopper portion 6b bent downward at the front end portion against an outer end edge portion of the lower flange 21b. Further, in the top plate 10, it is preferable to insert the stopper portion 10 b bent upward at the front end portion to a predetermined position by abutting the outer end edge portion of the square member 2. As a result, positioning of the beam 21 made of H-shaped steel, the support body 3 and the square member 2 can be ensured.

  Next, the nut 8 is raised along the support bolt 7 with the rotating plate 9 of the screw mechanism 5 as the vertical drive mechanism, and the movable body 4 is gradually raised, and finally a part of the upper surface of the square member 2 is moved. The square member 2 and the support body 3 are pressed against the lower surface of the upper flange 21a and fixed between the upper and lower flanges 21a and 21b of the beam 21. The rotary plate 9 is provided with a substantially cross-shaped brim around its periphery so that it can be easily rotated manually. By manually turning the rotating plate 9 until the square member 2 comes into contact with the lower surface of the flange 21a, and then tightening the nut 8 with a tool such as a spanner, the fixing operation can be performed quickly, easily and reliably. Further, for example, if a hole is made in the side surface of the rotary plate 9, it is possible to squeeze a rod or the like into this and tighten the plate using an insulator.

  At this time, when the stopper 6b provided on the base plate 6 is engaged with the lower flange 21b, the supporting bolt 7 is effectively prevented from being rotated and the nut 8 is tightened. The top plate 10 and the square member 2 may be fixed to each other with a nail or a screw nail 13 through a small hole (not shown) drilled in the stopper 10b of the top plate 10. The nail 13 may be used for positioning the top plate 10 and the square member 2.

  Thereafter, the formwork 22 is spanned between the pair of beams 21 facing each other, the end 22a is placed on the other portion exposed from the flange 21a on the upper surface of the square member 2, and a small hole formed in the end 22a. It may be fixed to each other with a nail or a screw nail 14 (not shown) passing therethrough.

  Thereafter, concrete is placed in a slab forming region formed by a large number of molds 22, and dried and solidified. Thereby, formation of a slab is complete | finished.

  Further, after the concrete is dried and solidified, the nut 8 of the screw mechanism 5 of the formwork support 1 is rotated so as to loosen, and the pressing state of the top plate 10 and the square member 2 is released. The body 3 and the formwork 22 are removed from the formed slab. The removed square member 2, support body 3, and formwork 22 are separated from each other by pulling out the nails and screw nails 13 and 14, and then reused at other sites.

  Thus, the slab can be constructed using the formwork support 1 (1a, 1b) of the present embodiment. Specifically, with the support body 3 contracted, the square body 2 is inserted between the upper and lower flanges 21a and 21b of the beam 21 such as H-shaped steel, and then the length of the support body 3 is extended. Then, the end of the frame 22 is placed on the other part of the upper surface of the square member 2 by pushing up the square member 2 and fixing a part of the upper surface of the square member 2 to the lower surface of the upper flange 21a. Can be installed. Then, the slab can be constructed by placing concrete in the slab formation area. After that, the mold support 1 (1a, 1b) and the mold 22 can be disassembled and removed by contracting the length of the support body 3. Thus, the formwork support 1 (1a, 1b) and the slab construction method using the same according to the present embodiment are simplified in the overall structure including the formwork support 1 (1a, 1b). The construction work and the disassembly work on the beam 21 can be facilitated, and excellent effects such as the ability to support the mold 22 reliably and stably can be exhibited.

  In addition, this invention is not limited to the said embodiment, It can deform | transform as needed.

  For example, an air cylinder mechanism that expands and contracts in the longitudinal direction may be used as the vertical drive mechanism of the support body 3 instead of the screw mechanism 5.

  For example, as shown in another embodiment of FIG. 4, the shape of the support body 3 is a single reinforcing plate 12 attached to the column 11, or the shape of the top plate 10 and the rotating plate 9 (in the same figure (c)). The chain line indicates the planar shape of the rotating template 9 of the embodiment of FIG.

  In addition, when one of the beams 21 spanning the formwork 22 is H-shaped steel and the other is a butter angle, the formwork support 1 (1a, 1b) of the present invention is attached to the portion of the beam 21 of which one is H-shaped steel. ) Should be applied.

DESCRIPTION OF SYMBOLS 1, 1a, 1b Formwork support 2 Square material 3 Support body 4 Movable body 5 Screw mechanism 6 Base plate 10 Top plate 21 Beam 22 Formwork

Claims (8)

A formwork support for supporting a formwork between beams such as H-shaped steel,
A long square member on which the mold is placed on another part of the upper surface in a state where a part of the upper surface is pressed against the lower surface of the upper flange of the beam is formed separately from the square member. And a support body that is interposed between a lower surface of the square member and an upper surface of a flange on the lower side of the beam and that is capable of expanding and contracting in the vertical direction to apply a lifting force for pushing up the square member. Formwork support. A formwork support for supporting a formwork between beams such as H-shaped steel,
A long square member on which the mold is placed on another part of the upper surface in a state where a part of the upper surface is pressed against the lower surface of the upper flange of the beam;
It is formed separately from the square bar, and is vertically extendable to provide a push-up force that pushes up the square bar interposed between the lower surface of the square bar and the upper surface of the lower flange of the beam A formwork support characterized by comprising a supporting body. The formwork support according to claim 1 or 2, wherein the support body includes a movable body that is movable in the vertical direction and a vertical drive mechanism that moves the movable body in the vertical direction. . The mold support according to claim 3, wherein the vertical drive mechanism is a screw mechanism or an air cylinder mechanism that moves the movable body in the vertical direction. The support body has a top plate on which the square member is placed at an upper end and a base plate placed on the lower flange at a lower end, and both the plates extend in a direction perpendicular to the longitudinal direction of the flange. The formwork support according to any one of claims 1 to 4, wherein the insertion side end portion has an inclined surface. A square member is fixed to the beam using the mold support member according to any one of claims 1 to 5, and the mold is placed on the other portion of the upper surface of the square member fixed to the beam. A concrete slab construction method using a formwork support tool, wherein concrete is placed in a slab formation region formed and the concrete is solidified to form a slab and then the formwork support tool is removed. The said formwork is a steel flat deck of fixed length, and this flat deck is repeatedly used for the slab formation over the multilayer floor of one building, The formwork support tool of Claim 6 characterized by the above-mentioned. Slab construction method using The formwork support according to claim 6, wherein the formwork is a steel slide deck having a variable length, and the slide deck is repeatedly used for slab formation of a steel structure or a steel reinforced concrete structure. Slab construction method using tools.

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