JP2017166195A - Deck plate support and slab construction method using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a deck plate support and a slab construction method using the same, the deck plate support being usable without hindrance even to a plurality of types of H-section steels having different top and bottom flange intervals and flange thicknesses, and allowing fitting to and removal from the H-section steel safely, efficiently and in a short period of time.SOLUTION: A deck plate support 1 of the present invention includes: a support post 3 having a male screw part 3a provided on an outer peripheral surface and an upper bracket 2 fitted on a top end; a cylindrical leg part 5 having a lower bracket 4 fitted at a bottom end and rotatably holding the support post 3 inserted from above; a cylindrical support metal fitting 6 inserted externally and rotatably to the support post 3; a bracket 7 for a square timber and a reinforcement metal fitting 8 installed on the support metal fitting 6; and an upper nut 9 and a lower nut 10 screwed into the male screw part 3a of the support post 3, between the support metal fitting 6 and the leg part 5.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a slab construction method for forming a concrete slab on a floor, a ceiling or the like in a building made of H-shaped steel as a structural material, and in particular, a deck plate support that enables reuse of a deck plate used as a formwork. It is related with the slab construction method using it.

  In buildings that use reinforced concrete or steel reinforced concrete as a structural material, deck plates made from steel plates may be used as a formwork for forming concrete slabs. It was fixed by bolting. However, with such a method, there is a problem that the recovery becomes difficult because the deck plate is embedded in the slab as the concrete solidifies.

Here, the structure of the deck plate will be described with reference to FIG. 6A is a side view of the deck plate, and FIGS. 6B and 6C are plan views of two types of formwork members constituting the deck plate shown in FIG. 6A. .
6B and 6C correspond to views showing a state in which the deck plate viewed in the direction indicated by the arrow B in FIG. 6A is disassembled into two formwork members.

As shown in FIGS. 6A to 6C, the deck plate 51 includes a flat plate 54, 55 whose upper surfaces 54a, 55a become molding surfaces when placing concrete, and a lower surface of the flat plates 54, 55. It consists of steel plate formwork members 52, 53 having a thickness of about 0.8 mm, which are formed by square pipes 56, 57 fixed to 54b, 55b by welding, bonding, rivets or screws.
One end of each of the square pipes 56 and 57 is pressed and deformed in a flat shape, and a long steel plate member (not shown) is formed so as to close the end (hereinafter referred to as flat ends 56b and 57b). It is inserted inside. The outer diameter of the square pipe 56 is smaller than the inner diameter of the square pipe 57, and the opening end 56a is formed so as to be inserted into the opening end 57a.

  The upper surface of the square pipe 56 is spot-welded to the flat plate 54 at two locations near the center in the longitudinal direction and near the flat end 56b. The upper surface of the square pipe 57 is near the center in the longitudinal direction with respect to the flat plate 55. Three spots near both ends are spot welded. Thereby, the mold member 52 inserts the square pipe 56 into the square pipe 57 of the mold member 53 so that the flat plate 55 is placed between the lower surface 54 b of the flat plate 54 and the upper surface of the square pipe 56. Only the length can be inserted.

  Since the flat plates 54 and 55 are as thin as about 0.8 mm, the flat plate 55 is inserted between the lower surface 54b of the flat plate 54 and the upper surface of the square pipe 56, and a part of the flat plates 54 and 55 is overlapped. Even when concrete is placed on the upper surfaces 54a and 55a, there is no possibility that the concrete will enter between the lower surface 54b of the flat plate 54 and the upper surface 55a of the flat plate 55.

In this way, the deck plate 51 connects the mold member 52 to the mold member 53 so that the open end 56a of the square pipe 56 is inserted into the open end 57a of the square pipe 57, and FIG. As shown by an arrow X, the overall length can be easily changed by sliding the mold members 52 and 53 with each other. Therefore, the deck plate 51 has a wide range of use after being recovered from the concrete slab and is suitable for reuse.
However, as described above, if the deck plate 51 is fixed to the upper surface of the beam by welding, bolting, or the like, separation and recovery from the concrete slab becomes difficult, and thus there is a problem that it cannot be easily reused. .

  In recent years, in order to cope with such a problem, a method of installing a deck plate in a recoverable state at the time of construction of a concrete slab has been proposed. For example, in Patent Document 1, a formwork support suitable for supporting a formwork used when constructing a concrete slab under the name of “formwork support and a slab construction method using the same”, An invention relating to a method for constructing a concrete slab using the formwork support is disclosed.

“Formwork support” disclosed in Patent Document 1 is an upper and lower flange of an H-shaped steel for supporting a square member on which the formwork is placed when an slab of a steel reinforced concrete structure is formed. It consists of a movable body, a screw mechanism, and a nut, and is equipped with a support body that can be expanded and contracted in the vertical direction, and a top plate that receives a square member above the support body. It is characterized by that.
With such a structure, it is possible to reliably support the mold in a stable state.

Patent Document 2 discloses an invention relating to an apparatus for supporting a formwork used when constructing a concrete slab under the name of “temporary formwork support apparatus”.
The invention disclosed in Patent Document 2 includes a temporary support part that supports the temporary formwork from below, and a fixing mechanism that is disposed at both end portions of the temporary support part so that the inner surfaces of the upper and lower flanges of the beam can be pressed against each other. It has a structure.
In this case, since the temporary support portion is fixed to the beam by the fixing mechanism, it is not necessary to support the temporary support portion using a column extending to the floor surface below the floor.

Japanese Patent Laying-Open No. 2015-105552 JP 2002-303041 A

  In the invention disclosed in Patent Document 1, the formwork support has a structure in which a square member is fixed between the upper flange of the H-shaped steel beam and the top plate, and therefore the square member is fixed to the upper flange of the H-shaped steel. The movable body must be lifted by operating the nut of the formwork support while maintaining the state in contact with the lower surface. At this time, the formwork support is not fixed to the H-shaped steel and is in an unstable state. Therefore, the above operation is performed by holding the column bolt part by hand. It is necessary to do it in a fixed state. Furthermore, when removing the formwork support from the H-shaped steel, it must be supported so that the square bar does not fall. Moreover, since the square bar is a long heavy article, it is presumed that it is not easy to keep its upper surface in a horizontal state and keep it in contact with the lower surface of the upper flange of the H-shaped steel.

  Further, since the upper surface of the square bar is in contact with the lower surface of the upper flange, the height of the upper surface of the square bar cannot be adjusted. Therefore, when using this formwork support for H-shaped steel having a different flange thickness, the height of the upper surface of the formwork must be adjusted by installing a spacer on the lower surface side of the formwork, There was a problem that it took time to install the formwork.

  Furthermore, the support pipes that make up the movable body are only mounted on the support bolts that make up the screw mechanism, and are not structured to restrict the rotation of the support pipes with respect to the support bolts. It is not possible to completely prevent the top plate from rotating when it is rotated. In addition, there is a possibility that the column pipe may accidentally fall off from the column bolt during the operation of carrying the formwork support or attaching it to the H-shaped steel.

  Since the invention disclosed in Patent Document 2 is not a structure in which the height of the upper surface of the square bar can be adjusted, it is disclosed in Patent Document 1 when used for an H-shaped steel beam having a different upper flange thickness. As in the case of the invention, it is necessary to adjust the height of the upper surface of the mold by installing a spacer on the lower surface side of the mold. Therefore, there is a high possibility that the installation work of the mold cannot be performed efficiently in a short time.

  In addition, the fixing mechanism consisting of bolts and nuts, etc., which is installed so that the inner surface of the flange of the beam can be pressed, is not structured to restrict the rotation around its central axis, and when rotating the bolt, It is thought that workability is not good because it must be held by hand so that other parts do not rotate.

  The present invention has been made in response to such a conventional situation, and can be commonly used for a plurality of types of H-shaped steels having different upper and lower flange intervals and different flange thicknesses. An object of the present invention is to provide a deck plate support that can be safely and efficiently attached to and removed from a steel plate in a short time and a slab construction method using the same.

  In order to achieve the above object, the first invention is parallel to the vertical direction when a concrete slab is enforced in a building made of H-shaped steel, which is installed such that the upper flange and the lower flange are horizontal. A deck plate support that is installed between the upper flange and the lower flange to support the square member, and has a male screw portion on the outer peripheral surface and an upper receiving bracket attached to the upper end, and a lower end The lower support bracket is attached to the tube, and the cylindrical leg portion that rotatably holds the column inserted from above, the cylindrical support bracket that is rotatably inserted to the column, and the support bracket installed on the support bracket. And an upper nut and a lower nut that are screwed into the male thread portion of the support column between the support bracket and the leg portion.

  In the deck plate support having the above structure, when the lower nut is rotated in a state where the support column is arranged above the leg and the support column is set so that the axial direction of the support column is parallel to the vertical direction, the support column moves up and down. It has the effect of moving in the direction. Further, when the upper nut is rotated in this state, the square member receiving bracket moves in the vertical direction together with the supporting bracket.

  Further, according to a second invention, in the first invention, an upper guide member and a lower guide member respectively provided so that the tip protrudes radially inward with respect to the support fitting and the leg, and the tip is inside. A guide groove provided on the outer peripheral surface of the support column in parallel with the axial direction between the upper end and the lower end so that the upper guide member and the lower guide member can be guided in the longitudinal direction in the arranged state. Is.

  In the deck plate support having such a structure, the tip of the upper guide member is disposed in a guide groove provided in parallel to the axial direction on the outer peripheral surface of the support column, and the upper guide member is provided in the support bracket. Therefore, in addition to the operation of the first invention, the guide groove has an operation of limiting the moving direction of the support metal fitting only to the axial direction of the support post and preventing the support fixture from rotating with respect to the support post.

In addition, since the tip of the lower guide member is disposed in the guide groove and the lower guide member is provided in the leg portion, the guide groove restricts the movement direction of the leg portion only to the axial direction of the column. , It has the effect of preventing the leg from rotating with respect to the column.
Further, if both ends of the guide groove are closed, the upper guide member and the lower guide member are respectively engaged with the upper end and the lower end of the guide groove, thereby preventing the support fitting and the leg from coming off from the support column. It has the action.

  According to a third aspect of the present invention, in the first or second aspect of the invention, the square member receiving bracket has a shape in which one end of the flat plate is bent at a right angle, and one end is supported so as to be orthogonal to the axial direction of the column. A first flat portion fixed to the metal fitting and having a rectangular shape in plan view, and a first upright portion extending upward from the other end of the first flat portion. is there.

  In the deck plate support having the above structure, in addition to the action of the first invention or the second invention, the support column is disposed above the leg portion and installed so that the axial direction of the support column is parallel to the vertical direction. When the square bar is placed on the upper surface of the first flat part of the square bar metal fitting in a state of being applied, the square bar is held horizontally by the first flat part. The first upright portion has an action of holding the square member placed on the upper surface of the first flat portion so as not to rotate around the axis center of the support column.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, the upper metal fitting has a shape in which one end of the flat plate is bent at a right angle so as to be orthogonal to the axial direction of the column. The second flat portion is arranged and has a rectangular shape in plan view, and a second upright portion extending upward from an end portion of the second flat portion.

  In the deck plate support having the above structure, the axial direction of the column is parallel to the vertical direction, and the upper flange and the lower bracket are pressed against the lower surface of the upper flange of the H-shaped steel and the upper surface of the lower flange, respectively. In the case where the second upright portion of the upper bracket is installed between the upper flange and the lower flange so as to contact the end surface of the upper flange, in addition to the action of any of the first to third inventions Since the upper metal fitting is locked to the upper flange of the H-shaped steel, it has an effect that the rotation around the axis center of the support is prevented.

  According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the lower bracket is formed in a U shape by bending both ends of a rectangular flat plate material in side view, and the shaft of the column A pair of third flat portions arranged so as to be orthogonal to the direction and a third upright portion provided so as to connect one ends of the pair of third flat portions. is there.

  In the deck plate support of the above structure, the axial direction of the column is parallel to the vertical direction, and the lower surface of the upper flange and the upper surface of the lower flange of the H-shaped steel are pressed by the upper and lower brackets, respectively, and the lower portion When the lower flange is sandwiched from above and below by the pair of third flat portions of the metal fitting, and the third upright portion is installed between the upper flange and the lower flange so as to contact the end surface of the lower flange, In addition to the action of any one of the first to fourth inventions, the lower bracket is locked to the lower flange of the H-shaped steel, so that the leg swings in a plane parallel to the third upright portion. And the rotation of the legs around the axis center is prevented.

In a sixth aspect based on the second aspect, the support column and the leg portion include a first screw hole and a second screw hole respectively provided in the outer peripheral surface in the radial direction, and the upper guide member and the lower guide member are It is characterized by being screwed into the first screw hole and the second screw hole.
In the deck plate support having such a structure, in addition to the operation of the second invention, the upper guide member and the lower guide member are rotated in a predetermined direction so that the first screw hole and the second screw hole are removed. When removed, it has the effect that the leg portion and the support fitting can be pulled out from the column.

  7th invention is the building which uses H-shaped steel as a structural material installed so that an upper side flange and a lower side flange may become horizontal, The deck plate support tool which concerns on either of 1st invention thru | or 6th invention A concrete slab construction method using a slab, in which a deck plate support is installed between the upper flange and the lower flange in parallel with the vertical direction, and the lower surface of the upper flange and the upper surface of the lower flange are A step of fixing the deck plate support to the H-shaped steel so as to press each other, a step of raising the square member installed on the deck plate support until its upper surface reaches a predetermined height, and an upper surface of the square member A step of installing a deck plate, a step of pouring concrete that has been previously mixed into the upper surface of the deck plate, and a square bar after the concrete has solidified A step of removal from Kkipureto support is for the step of removing the deck plate from the solidified concrete, the step of removing the deck plate support from H-section steel, comprising the.

  According to the slab construction method having such a configuration, when forming a concrete slab for a building having an H-shaped steel installed as a structural material so that the upper flange and the lower flange are horizontal, the first slab is formed. Any one of the effects of the invention to the sixth invention is exhibited.

  As described above, in the first invention, when the lower nut is rotated in a state where the support column is disposed above the leg portion and the axial direction of the support column is installed parallel to the vertical direction, the support column is Since it moves up and down, the overall length changes. Therefore, it is possible to install a plurality of types of H-shaped steels having different distances from the upper flange to the lower flange by adjusting the entire length according to the distances without trouble.

  Further, according to the present invention, after being installed between the upper flange and the lower flange, the lower nut is rotated to raise the support column, and the upper bracket and the lower receiver are placed on the lower surface of the upper flange and the upper surface of the lower flange. When the lower nut is further rotated by moving the lower nut while the metal fittings are in contact with each other, the lower surface of the upper flange and the upper surface of the lower flange are pressed by the upper receiving metal fitting and the lower receiving metal fitting, respectively. Thereby, it can fix reliably with respect to H-shaped steel.

  Furthermore, according to the deck plate support of the present invention, unlike the invention disclosed in Patent Document 1, it is not a structure that is fixed by installing a square member between the upper flange of the H-shaped steel and the upper receiving bracket. Therefore, until the deck plate support is fixed to the H-shaped steel, it is not necessary to continue to support the square material, which is a long heavy object, in a horizontal state so that the upper surface is in contact with the lower surface of the upper flange. It is. Further, when removing the deck plate support from the H-shaped steel, it is not necessary to separately support the square bar.

  And by turning the upper nut, the height of the upper surface of the square member installed on the square member receiving bracket can be easily adjusted. It is not necessary to adjust the height of the top surface of the deck plate by installing the. Therefore, the installation work of the mold can be performed efficiently in a short time.

  In the second invention, since the moving direction of the leg portion and the support bracket is limited to the axial direction of the support column, the leg portion and the support bracket may be rotated when the upper nut or the lower nut is rotated. There is no. Therefore, in the second invention, in addition to the effects of the first invention, the work of adjusting the overall length and the height of the upper surface of the square bar by moving the support pillar and the square bar bracket vertically is extremely difficult. It is possible to carry out efficiently. In addition, if both ends of the guide groove are closed, there is no risk of the legs and support brackets falling off from the support column when carrying or installing or removing from the H-shaped steel. Are better.

  According to the third invention, since the first flat portion of the square metal bracket is already in a horizontal state when it is installed in the H-shaped steel so that the axial direction of the support column is parallel to the vertical direction, In addition to the effects of the first invention or the second invention, there is an effect that the installation work of the square bar can be performed efficiently. Further, when the square bar support is moved in the vertical direction, the square bar is not likely to swing around the support column, so that the work can be performed safely and efficiently.

  In the fourth invention, in addition to the effect of any of the first to third inventions, the lower surface of the upper flange and the upper surface of the lower flange are respectively pressed by the upper receiving metal fitting and the lower receiving metal fitting. When the lower nut is rotated to raise the column, the upper metal fitting locked to the upper flange prevents the column from swinging with respect to the H-shaped steel, so that the work can be performed safely and efficiently. Play.

  In the fifth aspect of the invention, when the leg portion is installed on the lower flange of the H-shaped steel, the leg portion is locked to the lower flange via the lower bracket, so that the upper bracket is brought into contact with the upper flange. Even so, there is no risk of falling over or peristing. Therefore, according to the fifth invention, in addition to the effects of any one of the first to fourth inventions, the work of raising the column after the leg portion is installed on the lower flange of the H-shaped steel can be safely performed. The effect that it can perform efficiently is produced.

  In the sixth invention, the upper guide member and the lower guide member are rotated in a predetermined direction and removed from the first screw hole and the second screw hole, so that the leg portion and the support fitting can be extracted from the support column. . Therefore, in the sixth invention, in addition to the effect of the second invention, there is an effect that it is easy to carry and store by disassembling and making it not bulky. Furthermore, since the combination of the column and the leg can be changed, for example, if a plurality of types of columns and legs having different lengths are prepared in advance, the distance from the upper flange to the lower flange of the H-shaped steel can be increased. Even if they are different, it can be easily handled by appropriately changing the combination of the column and the leg.

  In the slab construction method according to the seventh invention, since the effect of any of the first invention to the sixth invention is exhibited, a plurality of types of H-shaped steels having different upper and lower flange intervals and different flange thicknesses are used. There is an effect that it can be applied to a building as a structural material without any problem.

(A) And (b) is an external appearance perspective view of the Example of the deck plate support tool and support | pillar which concerns on embodiment of this invention, respectively. It is an AA arrow directional cross-sectional view in Fig.1 (a). It is the flowchart which showed the Example of the procedure at the time of constructing concrete slab using the deck plate support of this invention. (A) And (b) is a side view which shows the state in which the deck plate support of this invention was attached to the H-shaped steel. (A) And (b) is the side view which expanded and showed the state where the deck plate support of this invention was attached to the H-shaped steel. (A) is a side view of a deck plate, (b) and (c) are plan views of two types of formwork members constituting the deck plate shown in FIG.

  The deck plate support of the present invention will be specifically described with reference to FIGS. The deck plate support of the present invention is used by being installed between the upper flange and the lower flange of the H-shaped steel so that the longitudinal direction is parallel to the vertical direction. Therefore, in the following description, the expression “upper end” and “lower end” is used instead of “one end” and “other end”, assuming that the deck plate support is actually installed. ing.

1 (a) and 1 (b) are perspective views showing an example of the appearance of the deck plate support of the present invention and the struts constituting the same, respectively, and FIG. 2 is an AA line in FIG. 1 (a). It is arrow sectional drawing.
As shown in FIGS. 1 and 2, the deck plate support 1 of the present invention includes a support column 3 having a male screw portion 3a on the outer peripheral surface and an upper receiving bracket 2 attached to the upper end, and a lower receiving bracket on the lower end. 4 is attached, and the cylindrical leg part 5 which hold | maintains so that the support | pillar 3 inserted from upper direction can be rotated, the cylindrical support metal fitting 6 inserted in the support | pillar 3 so that rotation is possible, and it installs in the support metal fitting 6 The square member receiving metal 7 and the reinforcing metal 8 are provided, and the upper nut 9 and the lower nut 10 that are screwed into the male screw portion 3a of the support column 3 between the support metal 6 and the leg 5 are provided.

The upper receiving bracket 2 is provided with a rubber plate 11a on the upper surface and is disposed so as to be orthogonal to the axial direction of the support column 3, and has a flat portion 2a having a rectangular shape in plan view, and upward from the end of the flat portion 2a. It consists of the upright part 2b extended so that it may face, and it has the shape where the rectangular flat plate material was bent at one end at right angles. The upper metal fitting 2 is welded to the upper end of the support column 3, and a rubber plate 11a is joined to the upper surface of the flat portion 2a using an adhesive or the like.
Further, a guide groove 3b having both ends closed between the upper end and the lower end is provided on the outer peripheral surface of the support column 3 with a predetermined width in parallel with the axial direction (see FIG. 1B).

The lower receiving metal 4 has a rectangular shape of a flat plate 4a, 4b arranged so as to be orthogonal to the axial direction of the support column 3, with both ends of a rectangular flat plate being bent to form a "U" shape in side view, It consists of the upright part 4c provided so that the ends of flat part 4a, 4b may be connected. However, the lower metal fitting 4 is welded to the lower end of the leg part 5, and the rubber plate 11b is joined to the lower surface of the flat part 4a using an adhesive or the like.
In addition, the lower receiving metal fitting 4 may have a structure provided with means for temporarily holding the lower flange of the H-shaped steel. In this case, in Step S3 and Step S8, which will be described later, it is possible to expect an effect that the safety when the lower nut 10 is rotated to raise or lower the support column 3 is further increased.
On the other hand, the leg portion 5 is provided with a screw hole (not shown) in the outer peripheral surface in the radial direction, and a lower guide member 12b that is screwed into the screw hole has a tip that extends toward the inside of the guide groove 3b of the column 3. It is screwed so that it can be placed. In this case, the guide groove 3b has the effect of restricting the movement direction of the leg portion 5 together with the lower guide member 12b to the axial direction of the support column 3 and preventing the rotation of the leg portion 5 with respect to the support column 3.

  The support metal fitting 6 is provided with a screw hole (not shown) in the outer peripheral surface in the radial direction, and an upper guide member 12a that is screwed into the screw hole is disposed at the tip with respect to the guide groove 3b of the column 3. It is screwed in as possible. Thereby, the upper guide member 12a is movable only with respect to the longitudinal direction of the guide groove 3b. In this case, the guide groove 3b has an action of limiting the moving direction of the support fitting 6 together with the upper guide member 12a only to the axial direction of the support column 3 and preventing the support fitting 6 from rotating with respect to the support column 3.

The square member receiving bracket 7 is extended so as to be directed upward from the other end of the flat portion 7a, and a flat portion 7a having one end welded to the support bracket 6 to form a rectangular shape in plan view so as to be orthogonal to the axial direction of the column 3. It consists of the upright part 7b, and has comprised the shape where the end of the flat plate material was bent at right angle. Further, the reinforcing metal fitting 8 has a right-angled triangular shape in plan view, and two end faces sandwiching the right angle are welded to the outer peripheral surface of the support column 3 and the lower surface of the square member receiving metal fitting 7, respectively.
The upper nut 9 is installed above the lower nut 10, and a pair of protrusions 9a, 9a and protrusions 10a, 10a are provided in parallel to the radial direction on the outer peripheral surfaces of the upper nut 9 and the lower nut 10, respectively. It has been.

  In the deck plate support 1 having such a structure, the lower nut 10 is installed in such a state that the support column 3 is disposed above the leg portion 5 so that the axial direction of the support column 3 is parallel to the vertical direction. When the column is rotated, the column 3 moves up and down. That is, in the deck plate support 1, the entire length is easily changed by a simple operation of rotating the lower nut 10, so that a plurality of types of H-shaped steels having different distances from the upper flange to the lower flange can be used. However, it can be installed without any trouble by adjusting the overall length according to the distance.

Moreover, in the deck plate support 1, since the upper guide member 12a and the lower guide member 12b are respectively locked to the upper end and the lower end of the guide groove 3b, the leg portion is required for carrying, installation or removal from the H-shaped steel. Since there is no fear that 5 and the support metal fitting 6 will come off from the support | pillar 3 arbitrarily, it is excellent in safety.
Further, when the upper guide member 12 a and the lower guide member 12 b are rotated in a predetermined direction and removed from the screw holes of the support fitting 6 and the leg portion 5, the leg portion 5 and the support fitting 6 can be extracted from the column 3. In this case, there is an advantage that it is easy to carry and store by disassembling and making it not bulky. In addition, since the combination of the strut 3 and the leg 5 can be changed, for example, if a plurality of types of struts 3 and legs 5 having different lengths are prepared in advance, the lower side from the upper flange of the H-shaped steel Even when the distance to the flange is different, it can be easily handled by appropriately changing the combination of the column and the leg.

Next, a concrete slab construction method using the deck plate support 1 will be described with reference to FIG. 3 while referring to FIGS. 4 and 5 as appropriate.
FIG. 3 is a flowchart showing an embodiment of a work procedure when constructing a concrete slab using the deck plate support of the present invention. FIGS. 4 and 5 are enlarged side views showing the attachment state of the deck plate support to the H-shaped steel in order to explain the work procedure.
Note that the notations 52 (53) and 56b (57b) in FIG. 5B are mounted on the upper surface of the square member 14 supported by the deck plate support 1 in the same state as both of the mold members 52 and 53. It can be placed. 1, 2, and 6 are assigned the same reference numerals, and descriptions thereof are omitted.

First, in step S1, the height at which the deck plate support 1 can be installed between the upper flange 13a and the lower flange 13b of the H-shaped steel 13 by holding the protrusion 10a and rotating the lower nut 10 in a predetermined direction. Adjust to.
Next, in step S2, the lower flange 13b is sandwiched from above and below by the pair of flat portions 4a and 4b of the lower bracket 4 with respect to the H-shaped steel 13, and the lower surface of the rubber plate 11b is brought into contact with the upper surface of the lower flange 13b. The deck plate support 1 is placed between the upper flange 13a and the lower flange 13b so that the longitudinal direction is parallel to the vertical direction so that the upright portion 4c is brought into contact with the end surface of the lower flange 13b ( (See FIG. 4 (a)).

  In step S3, the support nut 3 is lifted by rotating the lower nut 10 in a predetermined direction with the protrusion 10a, and the upper surface of the rubber plate 11a installed on the upper surface of the flat portion 2a of the upper metal fitting 2 is moved upward. It abuts on the lower surface of the flange 13a. At this time, as described above, since the moving direction of the leg portion 5 is limited only to the axial direction of the support column 3, there is no concern that the leg portion 5 rotates with the rotation of the lower nut 10.

Further, the upper metal fitting 2 and the lower metal fitting 4 are respectively engaged with the upper flange 13 a and the lower flange 13 b of the H-shaped steel 13, thereby preventing the support 3 and the leg 5 from rotating around the axis center. Further, since the deck plate support 1 is installed so that the lower flange 13b is sandwiched from above and below by the flat portions 4a and 4b of the lower bracket 4, legs in a plane parallel to the upright portion 4c of the lower bracket 4 are provided. The swinging of the part 5 is prevented.
That is, in the deck plate support 1, when the leg portion 5 is installed on the lower flange 13 b of the H-shaped steel 13, the leg portion 5 is locked to the lower flange 13 b via the lower bracket 4. Even before the metal fitting 2 is brought into contact with the upper flange 13a, there is no risk of falling over or swinging. Therefore, the lower nut 10 can be rotated to raise the support column 3 safely and efficiently.

  Further, with the upright portion 2b in contact with the end face of the upper flange 13a, the lower nut 10 is rotated to raise the column 3. As a result, the lower surface of the upper flange 13a and the upper surface of the lower flange 13b are pressed by the flat portion 2a of the upper bracket 2 and the flat portion 4a of the lower bracket 4, respectively. The support tool 1 can be fixed (see FIG. 4B).

  Thus, since the deck plate support 1 does not have a structure in which the square member 14 is installed between the upper flange 13a of the H-shaped steel 13 and the upper receiving bracket 2, the deck plate support 1 is used as the H-shaped steel. Until it is fixed to 13, it is not necessary to continue to support the square member 14, which is a long heavy object, in a horizontal state so that the upper surface thereof is in contact with the lower surface of the upper flange 13 a. Further, when the deck plate support 1 is removed from the H-shaped steel 13, it is not necessary to separately support the square member 14.

In step S4, the square member 14 is installed on the upper surface of the flat portion 7a so that the side surface of the square member receiving metal 7 is brought into contact with the upright portion 7b (see FIG. 5A). Then, the upper nut 9 is rotated in a predetermined direction with the protruding portion 9a, and the support bracket 6 is raised until the upper surface of the square member 14 installed on the square member receiving bracket 7 reaches a predetermined height.
In the deck plate support 1, the flat portion 7a of the square member 7 is already in a horizontal state when the H-shaped steel 13 is set so that the axial direction of the column 3 is parallel to the vertical direction. . In addition, when the square bar receiving metal 7 is raised, there is no concern that the square bar 14 swings around the column 3. Further, as described above, since the moving direction of the support fitting 6 is limited only to the axial direction of the support column 3, there is no possibility that the support fitting 6 rotates with the rotation of the upper nut 9. Therefore, in the deck plate support 1, the above-described operation of installing the square member 14 on the square member receiving metal member 7 and raising the support metal member 6 can be performed safely and efficiently.

  Moreover, according to the deck plate support 1, since the height of the upper surface of the square member 14 installed in the square member receiving bracket 7 can be easily adjusted by rotating the upper nut 9, the thickness of the upper flange 13a is different. Even when used for the H-shaped steel 13, it is not necessary to adjust the height of the upper surface of the deck plate 51 by installing a spacer on the upper surface of the square member 14. Therefore, the installation work of the mold can be performed efficiently in a short time.

  In step S5, the formwork members 52 and 53 are slid to adjust the overall length of the deck plate 51, and then the flat ends 56b and 57b of the deck plate 51 are placed on the top surface of the square member 14 (see FIG. 5B). . In step S <b> 6, the concrete kneaded in advance is poured into the upper flange 13 a of the H-shaped steel 13 and the upper surface of the deck plate 51. Thereby, the concrete placing operation is completed, and the concrete is solidified to form a concrete slab.

In step S7, the upper nut 9 is rotated in a predetermined direction with the protruding portion 9a, and the support bracket 6 is lowered until the state shown in FIG. To remove. Thereby, since the restriction | limiting with respect to the downward movement of the deck plate 51 is cancelled | released, it becomes easily separable from a concrete slab.
Further, in step S8, by holding the projection 10a and rotating the lower nut 10 in a predetermined direction, the column 3 is lowered until the state shown in FIG. 1 is removed from the H-shaped steel 13.
Finally, in step S9, the deck plate 51 is removed from the concrete slab. Thereby, the construction work of the concrete slab using the deck plate support 1 is completed.

  As described above, the slab construction method using the deck plate support according to the present invention is also applicable to a building made of a plurality of types of H-shaped steels having different upper and lower flange intervals and different flange thicknesses. It is possible to apply.

  The invention described in claims 1 to 7 can be applied when a concrete slab is constructed on a floor or a ceiling of a multi-layered building using H-shaped steel as a structural material.

DESCRIPTION OF SYMBOLS 1 ... Deck plate support 2 ... Upper receiving metal fitting 2a ... Flat part 2b ... Upright part 3 ... Support | pillar 3a ... Male screw part 3b ... Guide groove 4 ... Lower receiving metal fittings 4a, 4b ... Flat part 4c ... Upright part 5 ... Leg part 6 ... Support metal fitting 7 ... Square metal receiving metal fitting 7a ... Flat part 7b ... Upright part 8 ... Reinforcing metal fitting 9 ... Upper nut 9a ... Protrusion 10 ... Lower nut 10a ... Protrusion 11a, 11b ... Rubber plate 12a ... Upper guide member 12b ... Lower guide member 13 ... H-shaped steel 13a ... Upper flange 13b ... Lower flange 14 ... Square material 51 ... Deck plate 52, 53 ... Formwork member 54, 55 ... Flat plate 54a, 55a ... Upper surface 54b, 55b ... Lower surface 56, 57 ... Square Pipe 56a, 57a ... Open end 56b, 57b ... Flat end

Claims (7)

In a building made of H-shaped steel, which is installed so that the upper flange and the lower flange are horizontal, between the upper flange and the lower flange in a state parallel to the vertical direction when a concrete slab is applied Deck plate support that is installed in and supports the square material,
A strut having a male screw portion on the outer peripheral surface and an upper receiving bracket attached to the upper end,
A cylindrical leg portion that is rotatably attached to the lower support metal bracket attached to the lower end and rotatably supports the support column inserted from above.
A cylindrical support fitting that is rotatably inserted into the support column;
Square bar support metal installed on this support metal,
A deck plate support, comprising: an upper nut and a lower nut that are screwed into the male thread portion of the support column between the support fitting and the leg portion. An upper guide member and a lower guide member respectively provided so that the tip protrudes radially inward with respect to the support fitting and the leg;
A guide groove provided on the outer peripheral surface of the support column in parallel with the axial direction between the upper end and the lower end so that the upper guide member and the lower guide member can be guided in the longitudinal direction in a state where the tip is disposed inside. The deck plate support according to claim 1, further comprising:   The square member receiving metal has a shape in which one end of a flat plate is bent at a right angle, and one end is fixed to the supporting metal so as to be orthogonal to the axial direction of the support column, and forms a first flat shape in a plan view. 3. The deck plate support according to claim 1, further comprising a first upright portion extending upward from the other end of the first flat portion. 4.   The upper receiving metal fitting has a shape in which one end of a flat plate is bent at a right angle, is arranged so as to be orthogonal to the axial direction of the support column, and has a second flat portion having a rectangular shape in plan view. The deck plate support according to any one of claims 1 to 3, comprising a second upright portion extending upward from an end portion of the flat portion.   The lower bracket has a pair of third flat portions arranged so that both ends of a rectangular flat plate member are bent to form a `` U '' shape in a side view and perpendicular to the axial direction of the support column, The deck plate support according to any one of claims 1 to 4, comprising a third upright portion provided so as to connect one ends of the pair of third flat portions. The support column and the leg portion each include a first screw hole and a second screw hole that are respectively provided in the outer peripheral surface in a radial direction.
The deck plate support according to claim 2, wherein the upper guide member and the lower guide member are screwed into the first screw hole and the second screw hole. In a building made of H-shaped steel, which is installed so that the upper flange and the lower flange are horizontal, as a structural material, a concrete slab using the deck plate support according to any one of claims 1 to 6. A slab construction method for forming
Installing the deck plate support parallel to the vertical direction between the upper flange and the lower flange;
Fixing the deck plate support to the H-shaped steel by pressing the lower surface of the upper flange and the upper surface of the lower flange, respectively;
Raising the square bar installed on the deck plate support until its upper surface has a predetermined height;
Installing a deck plate on the top surface of the square bar;
Pouring concrete previously kneaded into the upper surface of the deck plate;
Removing the square bar from the deck plate support after the concrete has solidified;
Removing the deck plate from the solidified concrete;
And a step of removing the deck plate support from the H-shaped steel.

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