JP4444848B2 - Beam forming method for concrete building and formwork holder for beam forming - Google Patents

Description

  The present invention relates to a method for forming a beam of a concrete building and a mold holder for holding a beam forming mold.

  Conventionally, wooden formwork panels have been used as formwork used in the construction of concrete structures.

  A wooden formwork panel is generally a plywood formwork having a thickness of about 12 mm as a piling board, and a reinforcing wood nail is nailed on the peripheral edge or middle part of the back (plywood panel). In connecting the plywood panels vertically and horizontally, the slats at the peripheral edge of the adjacent plywood panels are nailed and joined to each other. This type of plywood panel is usually prepared in a size that matches the standard dimensions of the plywood for the formwork. Built with wood.

  These formwork panels are held at regular intervals by a spacing tool such as a separator, and in order to prevent deformation due to the side pressure of the concrete, vertical and horizontal materials are applied to the outside in a grid pattern. These are built in such a manner that these and the separator are fastened with a binding tool such as a foam tie. As the vertical and horizontal members, wooden square members or single steel pipes (round pipes) are usually used.

  When forming a beam part using such a formwork panel, install a separator unless the formwork is lifted to accommodate the H-shaped steel beam and rebar inside with a forklift or a column. I can't do it. For this reason, there exists a problem that the installation operation | work of a separator is very difficult. In particular, the work of drilling holes in the side plate in the field so as to align with the pre-drilled holes of the web part of the H-shaped steel beam, and the work of fastening with both holes penetrating spacers and foam ties are extremely complicated. It was a time consuming work.

Therefore, a pair of L-shaped frames are slidably interposed with a vertical frame portion on the inside of a horizontal base frame in which wedge holes are arranged at predetermined intervals in a square steel pipe, and reinforcing ribs are provided on the vertical frame portion. There has been proposed a retaining plate holding device (Patent Document 1). According to this swash plate holding device, the both side plates set to the beam width are held by the ribs on the vertical frame portion reinforced with ribs, and the both side plates are fixed to the base frame with wedges. Since it is fastened to the vertical frame portion with bolts, there is an advantage that it is not deformed by the side pressure of the concrete. The beam forming form frame that is held by the skirting plate holding device and does not have a spacer or a separator may be simply lifted and arranged at a desired position for housing a reinforcing bar or a steel beam.
Japanese Utility Model Laid-Open No. 5-87146, paragraphs 0006-0009, FIG.

  However, in the conventional retaining plate holding device described above, the L-shaped frame is fixed to the base frame only by a wedge, so that the strength is not sufficient and the interval between the side plates becomes stepwise. In addition, in the conventional retaining plate holding device, since it is necessary to fasten the vertical frame portion and the side plate with bolts, sufficient workability has not been improved.

  The present invention has been made in view of such circumstances, has a sufficient strength, can easily adjust the distance between side plates, and can improve the workability sufficiently. An object of the present invention is to provide a mold holder for forming.

  A formwork holder for forming a beam of a concrete building according to the present invention comprises a square steel pipe, and a first horizontal frame extending in the horizontal direction and a first vertical extending from one end of the first horizontal frame vertically upward. A first L-shaped member formed integrally with a frame and a square steel pipe, and a second extending in the horizontal direction with one end slidably coaxially fitted to the other end of the first horizontal frame. And a second L-shaped member formed integrally with a second vertical frame extending vertically upward from the other end of the second horizontal frame, and the first and second horizontal frames are coaxial. The first and second horizontal frames are disposed below the bottom plate for beam formation, and the first and second frames are formed by the bolts and nuts. By adjusting the interval between the second vertical frames, the first and second vertical frames are Wherein the pair of side plates for forming from both sides is to clamping.

  In the method of forming a beam for a concrete building according to the present invention, a plurality of first members in a direction orthogonal to the direction in which the beam extends at a predetermined interval in the direction in which the beam of the concrete building extends in the upper part of the column. A step of arranging a plurality of second flap members in a direction perpendicular to the first flap member on a lower side of the plurality of first flap members; Placing the above-mentioned formwork holder on the first material at a predetermined interval in the beam extending direction so that the first and second vertical frames face downward; A step of installing a bottom plate and both side plates for forming the beam on the top and bottom of the mold holder so that the first and second vertical frames of the mold holder are facing upward, The both side plates built on the first flap material are clamped from both sides by the first and second vertical frames. A step of fastening the nut on the bolt of the mold holder, characterized in that a filling concrete in a space surrounded by the bottom plate and side plates.

  According to the mold holder according to the present invention, the first and second L-shaped members are adjusted in the vertical frame interval by the bolts passing through the horizontal frames coaxially and the nuts fastened to the bolts. The frame is not fastened to the side plate and is held by the clamping force of the bolts and nuts against the side plates, so it has sufficient strength, easy to adjust the distance, and greatly improves workability. There is an effect that it can be improved.

  Further, according to the method of forming a beam of a concrete building according to the present invention, the second flap material is stretched in a lattice shape under the first flap material installed on the upper portion of the support column, and the second The above-mentioned formwork holders are placed in the shape of the flap material at a predetermined interval so that the vertical frame faces downward, and then the bottom plate and both side plates are built on the first cover material, The work of turning the holder upside down and fastening the nut to the bolt completes the building of the beam forming formwork. In the present invention, since there is no bolting of the vertical frame to the side plate, the workability is very good, and the cost can be reduced by reducing the number of man-hours.

  FIG. 1 is a partially cutaway perspective view showing a built-in state of a beam forming form for a concrete building according to an embodiment of the present invention, and FIG. 2 is a sectional view of the same. FIG. 3 is a perspective view showing the formwork holder for forming the beam.

  A form for forming a beam 3 projecting downward on a part of the ceiling 2 of the concrete building 1 includes a bottom plate 4 and a pair of side plates 5 and 6 that are vertically attached to both upper ends of the bottom plate 4. Consists of. The bottom plate 4 and the side plates 5 and 6 are staking plates 7, 8, 9 made of plywood having a thickness of about 12 mm, respectively, and reinforcing nails nailed to the rear peripheral edge and the middle of these swash plates 7 to 9. It consists of trees 10, 11, and 12. At the upper ends of the side plates 5 and 6, other molds 13 and 14 of the same type for forming the ceiling 2 are horizontally attached.

  The bottom plate 4 is placed on a plurality of first flap members 16 having a size of about 120 mm square disposed on the top of the support column 15. The first flap members 16 are installed in a direction orthogonal to the direction in which the beam 3 extends at a predetermined interval in the direction in which the beam 3 extends. A pair of second flap members 17 are spaced apart from each other in a direction orthogonal to the first flap member 16 so as to connect the plurality of first flap members to the lower side of the first flap member 16. It is arranged in the space. The second flap material 17 is fixed to the first flap material 16 by bolts 18 and nuts 19.

  On the first blank 16, the mold holder 20 according to the present invention is arranged at a predetermined interval in the direction in which the beam 3 is formed. The mold holder 20 includes a first L-shaped member 21 and a second L-shaped member 22 made of a square steel pipe, and a bolt 23 and a nut 24 that adjust the distance between the L-shaped members 21 and 22 and tighten the mold. And a wedge 25 inserted between the L-shaped members 21 and 22 and a chain 26 for connecting the wedge 25 to the L-shaped member 21. The first L-shaped member 21 is formed by integrally forming a first horizontal frame 31 extending in the horizontal direction and a first vertical frame 32 extending vertically upward from one end of the horizontal frame 31 by welding or the like. The second L-shaped member 22 is formed by integrally forming a second horizontal frame 33 extending in the horizontal direction and a second vertical frame 34 extending vertically upward from one end of the horizontal frame 33 by welding or the like. The second horizontal frame 33 has a cross-sectional shape that can be slidably accommodated inside the first horizontal frame 31, and the bolt 23 penetrates the horizontal frames 31 and 33 coaxially. Therefore, the interval between the vertical frames 32 and 34 can be adjusted by tightening the nut 24 with respect to the bolt 23. The wedge 25 eliminates play between the first and second horizontal frames 31 and 33 and prevents the vertical frames 32 and 34 from becoming non-parallel.

  Note that the molds 13 and 14 of the ceiling 2 are supported by a third flap member 36 disposed on the support column 35.

  Next, a beam forming method for a concrete building using the above-described formwork holder 20 will be described.

  FIG. 4 is a diagram illustrating a beam forming method for a concrete building according to this embodiment in the order of steps.

  First, as shown in FIG. 3A, the first flap member 16 is installed on the upper portion of the support column 15. A plurality of first flap members 16 are installed in a direction orthogonal to the direction in which the beam 3 extends at a predetermined interval in the direction in which the beam 3 extends.

  Next, as shown in FIG. 4B, a pair of second flap members 17 are fixed to the lower side of the plurality of first flap members 16 in a direction orthogonal to the first flap member 16. Install in parallel at intervals. The second flap material 17 is fixed to the first flap material 16 with bolts 18 and nuts 19.

  Subsequently, as shown in FIG. 2C, the frame holder 20 is placed on the second blank member 17 at a predetermined interval in the direction in which the beam 3 extends. The mold holder 20 is arranged so that the first and second vertical frames 32 and 34 face downward. At this time, in the mold holder 20, the interval between the vertical frames 32 and 34 is set wider than the interval between the side plates 5 and 6 of the mold to be formed.

  Next, as shown in FIG. 4D, the bottom plate 4 and the side plates 5 and 6 for forming the beam 3 are built on the first blank 16. Since the bottom plate 4 is supported by the flap 16 and the side plates 5 and 6 are held by the mold holder 20 in the lateral pressure direction, they are temporarily fixed to the bottom plate 4 or the ceiling mold 13 by nailing or the like. It only has to be done. For this reason, the installation work of the bottom plate 4 and the side plates 5 and 6 is extremely easy.

  Finally, as shown in FIG. 5E, the mold holder 20 is turned upside down so that the first and second vertical frames 32 and 34 of the mold holder 20 face upward, and the side plates 5 , 6 are fastened with nuts 24 to the bolts 23 of the mold holder 20 so that the first and second vertical frames 32, 34 are clamped from both sides. The space surrounded by the bottom plate 4 and the side plates 5 and 6 is filled with concrete. The vertical frames 32 and 34 are not fixed to the side plates 5 and 6, but when the concrete is placed, the side plates 5 and 6 receive a force in the direction of spreading outward due to the pressure from the inside of the mold frame. Fastening of the vertical frames 32 and 34 to 5 and 6 is unnecessary.

  After placing the concrete, the mold holder 20 can be easily removed by loosening the nut 24. Thereby, the side plates 5 and 6 are also easily detached.

  Thus, according to the concrete building beam forming method using the mold holder 20 according to the present embodiment, there is no bolting of the vertical frames 32 and 34 to the side plates 5 and 6, so workability is extremely good. Cost reduction can be achieved by reducing man-hours.

1 is a partially cutaway perspective view showing a built-in state of a beam forming form for a concrete building according to an embodiment of the present invention. It is sectional drawing which shows the erection state of the form for beam formation of the concrete building. It is a perspective view which shows the formwork holder for the beam formation. It is a figure which shows the beam formation method of the concrete building which concerns on the embodiment in order of a process. It is a figure which shows the beam formation method of the concrete building which concerns on the embodiment in order of a process. It is a figure which shows the beam formation method of the concrete building which concerns on the embodiment in order of a process.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Concrete building, 2 ... Ceiling, 3 ... Beam, 4 ... Bottom plate, 5, 6 ... Side plate, 7-9 ... Saddle plate, 10-12 ... Wood, 13, 14 ... Formwork, 15, 35 ... Post , 16 ... first flap material, 17 ... second flap material, 18, 23 ... bolt, 19, 24 ... nut, 20 ... formwork holder, 21 ... first L-shaped member, 22 ... first 2 L-shaped members, 25 ... wedge, 26 ... chain, 31 ... first horizontal frame, 32 ... first vertical frame, 33 ... second horizontal frame, 34 ... second vertical frame, 36 ... third Swab material.

Claims (1)

A formwork holder for forming a beam for holding a formwork for forming a beam of a concrete building,
A first L-shaped member made of a square steel pipe and integrally formed with a first horizontal frame extending in the horizontal direction and a first vertical frame extending vertically upward from one end of the first horizontal frame;
A second horizontal frame that extends in the horizontal direction and is vertically upward from the other end of the second horizontal frame, which is made of a square steel pipe and that has one end side slidably coaxially fitted to the other end side of the first horizontal frame. A second L-shaped member formed integrally with a second vertical frame extending to
A bolt coaxially passing through the first and second horizontal frames;
A nut screwed onto the bolt,
The first and second horizontal frames are disposed below the bottom plate for beam formation,
The distance between the first and second vertical frames is adjusted by the bolts and nuts, so that the first and second vertical frames sandwich the pair of side plates for beam formation from both sides.
A method of forming a beam of a concrete building using a formwork holder for forming the beam of a concrete building,
Disposing a plurality of first flap members in a direction orthogonal to the direction in which the beams extend at predetermined intervals in the direction in which the beams of the concrete building extend in the upper part of the columns;
Stretching a plurality of second flap members in a direction orthogonal to the first flap member on the lower side of the plurality of first flap members;
Placing the mold holder on the second flap material at a predetermined interval in the beam extending direction so that the first and second vertical frames face downward;
Building a bottom plate and side plates for forming the beam on the first flap material;
The mold holder is turned upside down so that the first and second vertical frames of the mold holder are facing upward, and both side plates built on the first flap are attached to the first flap. Fastening a nut to the bolt of the mold holder so as to be clamped from both sides by the first and second vertical frames;
Filling the space surrounded by the bottom plate and both side plates with concrete;
A method for forming a beam of a concrete building, comprising:

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