JPH0447094B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a sheet material provided with bending lines and perforation lines and used to form a rectangular frame;
The present invention also relates to a method of forming a rectangular frame using this sheet material.

[Conventional technology]

Conventionally, in order to form a rectangular hole in a concrete wall, as shown in FIGS. 9 and 10, a temporary frame 31 with plate materials nailed vertically and horizontally is assembled, and this temporary frame 31 is nailed to one formwork 32. 33 and place concrete C between the opposed formworks 32',
After the concrete C has hardened, the formworks 32, 32' and the temporary frame 31 are sequentially removed to form a rectangular hole 34 in the concrete wall.

[Problem that the invention seeks to solve]

In the conventional method, it is necessary to assemble the temporary frame 31 one by one by nailing board materials corresponding to the vertical and horizontal dimensions of the square hole to be formed, so a temporary frame corresponding to each size of the square hole to be formed is different. 31, making it extremely troublesome to manufacture the temporary frame 31. In addition, in order to remove the temporary frame 31 after the concrete C has hardened, the temporary frame 31 must be taken apart. There was a problem that it took a long time to remove the 31.

In view of the problems of such conventional methods, the present invention has been developed by assembling sheet materials provided with bending lines and cutting lines into a rectangular shape and fixing them to a formwork.
Easily and inexpensively produce rectangular frames of various sizes,
This was done to simplify the work of forming square holes in concrete walls.

[Means for solving problems]

The present invention includes a bottom plate portion fixed to the formwork, a side plate portion located perpendicular to the formwork surface in an assembled state, a support plate portion for supporting the force applied to the outside of the side plate portion, and a support plate portion for supporting the force applied to the outside of the side plate portion. A fixing plate part for fixing the plate part to the formwork is provided along the width direction in this order, and a first bending line is provided in the longitudinal direction at the boundary of each plate part. , second on the side plate
Using a sheet material in which a folding line is provided in the width direction, and cutout lines are provided on the other plate parts except for the side plate parts, which are inclined from both ends of the second folding line,
This sheet material is cut out in a V-shape along the cutting line at the corners corresponding to the square holes to be formed in the concrete wall, and after fixing the bottom plate of the sheet material to one formwork, the cross section is made at right angles. One side of the rectangular frame is formed by sequentially bending the other plate parts inward through the first bending line to form a triangular shape and fixing the fixed plate part to the formwork. The gist is to bend the side plate part at right angles along the bending line to form the corner part of the rectangular frame, and then sequentially form the other three sides of the rectangular frame and assemble and fix it to the formwork to form the rectangular frame. There is.

〔Example〕

Embodiments of the invention are shown in FIGS. 1-4.

First, the sheet material P for forming the rectangular frame F will be explained. This sheet material P is made of, for example, waterproof cardboard.

The sheet material P is a belt-shaped sheet as shown in FIG.
and a fixed plate part 4 are provided along the width direction in this order, and each plate part 1, 2, 3, 4 has L ₁ ,
It has a width of L ₂ , L ₃ , and L ₄ . The width ₂ of the side plate portion 2 is the wall thickness of the concrete wall W.

First bending lines 5, 6, 7 are provided in the longitudinal direction at the boundary portions of each plate portion 1, 2, 3, 4, and the side plate portion 2 is provided at regular intervals. A large number of second bending lines 8 are provided in the width direction.

The bottom plate part 1 has a 45° angle in different directions with respect to the width direction so as to intersect at one end of the bending line 8.
Two inclined perforation lines 9 are provided continuously in the length direction at a constant interval.

Therefore, the angle formed by the perforation lines 9 inclined in different directions is 90°, so that when cutting the sheet material P to form the rectangular frame F, the rectangular frame F
It is arranged so that adjacent sides among the four sides constituting the square can easily maintain right angles.

Further, the support plate part 3 and the fixing plate part 4 have two perforation lines 10 that are inclined in different directions with respect to the width direction so as to intersect at the other end of the bending line 8.
are provided continuously in the length direction at regular intervals. Cutting lines 10 inclined in different directions
The angle θ is set so that adjacent support plate portions 3 do not interfere with each other when the sheet material P is cut and assembled into a rectangular shape.

The first and second bend lines 5, 6, 7, 8 and perforation lines 9, 10 provided on the sheet material P are indicated by printing or the like.

Then, as shown in Fig. 2, the sheet material P described above is cut into a length corresponding to the size of the rectangular hole to be formed in the concrete wall W (the vertical and horizontal lengths are A and B, respectively). , the parts corresponding to the corners of the square holes in the bottom plate part 1 and the support plate part 3 of the cut sheet material P are cut along the respective cutting lines 9, 1.
Cut each piece into a V-shape along 0. The cut sheet material P' was cut to the same length as the inner circumference [2(A+B)] of the rectangular hole to be formed in the concrete wall W, so it was cut into the vertical and horizontal pieces of the rectangular frame F. Two corresponding parts are provided alternately.

Assemble this sheet material P' into a frame shape and form one frame 1.
1a, first fix the bottom plate part 1 to the formwork 11a using nails 12, as shown in FIG. ,4
First bending lines 5, 6, 7 provided at the boundary portion
Bend the side plate part 2, support plate part 3, and fixing plate part 4 inward one after another.Finally, overlap the fixing plate part 4 provided at the end of the sheet material P' on the end of the bottom plate part 1, and tighten the nails. 12 to fix the fixing plate part 4 to the formwork 11a, and bend the side plate part 2 of the sheet material P' at right angles along the second bending line 8, as shown in FIGS. 3 and 4. As shown in , the sheet material P' is assembled into a rectangular shape to form a rectangular frame F, and this rectangular frame F is a formwork 1.
It is fixed at 1a.

Next, as shown in FIG. 4C, the other formwork 11b is placed against the formwork 11a,
The concrete C is poured between the formworks 11a and 11b in this state, and after the concrete C hardens, the formworks 11a and 1
Remove 1b and square frame F.

Now, as shown in the same figure, a concrete wall W with a wall thickness corresponding to the width L 2 of the side plate part ₂ of the sheet material P' is formed, and this concrete wall W has the width L2 of the side plate part 2 of the sheet material P'. A correspondingly sized penetrating rectangular hole 13 is formed.

Here, the support plate portion 3 of the rectangular frame F functions as an inclined beam, and this support plate portion 3 effectively receives the lateral pressure applied to the side plate portion 2 during pouring of the concrete C, so that the pressure resistance is high. Further, the removal of the rectangular frame F after the concrete C has hardened can be carried out extremely easily and quickly since the rectangular frame F is made of sheet material.

Furthermore, if the width L ₂ of the side plate portion 2 of the sheet material P' is smaller than the thickness T of the concrete wall to be poured, as shown in FIG. The rectangular plate F may be fixed to the formwork 11a by interposing a plate material 14 having a thickness t corresponding to the insufficient thickness between the rectangular plate F and the bottom plate part 1, or by providing a bottom plate.

Moreover, if a material that can be easily cut with a knife, such as cardboard, is used as the sheet material, anchor bolts, inserts, etc. can be easily attached to the side plate portion 2 of the rectangular frame F. That is, as shown in FIG. 6, a cross groove 15 is formed in the side plate part 2 of the square frame F using a knife, and as shown in FIGS. 7 and 8, an anchor is inserted from the outside of the side plate part 2. It can be attached by pushing the bolt 16 or insert 17 into the cross groove 15.

In the above embodiment, the length of the inner circumference of the rectangular hole 13 in which the sheet material P is formed in the concrete wall W [2]
(A+B)] was used, so the parts corresponding to the vertical and horizontal pieces of the rectangular frame are continuous, but the sheet material P is cut into the square hole 1. Cut into half [A+B] the length of the inner circumference of the rectangular frame, and use two continuous sheets of paper so that the corresponding parts of the vertical and horizontal pieces of the rectangular frame are one piece, and assemble the sheet materials into the formwork 11a. By connecting both sheets when fixing them, the work of assembling the sheet material into a rectangular shape and fixing it to the formwork 11a may be facilitated.

〔Effect of the invention〕

The present invention involves cutting a sheet material provided with bending lines and cutting lines to a length corresponding to the size of a rectangular hole to be formed in a concrete wall, and The parts corresponding to the corners are cut into a V-shape, and the sheet material cut to a predetermined length is assembled into a rectangular shape and fixed to the formwork. A rectangular frame of the same size can be easily and inexpensively manufactured. Therefore, it is possible to improve the working efficiency for forming square holes in a concrete wall.

Further, by displaying the bending line and the cutting line by printing or the like, it is possible to supply a large amount of long sheet material at low cost.

In addition, the support plate portion of the square frame functions as an inclined beam against the side pressure applied to the side plate portion during concrete pouring, so the pressure resistance is high. Furthermore,
Since the rectangular frame is made of sheet material, the rectangular frame can be easily and quickly removed after the concrete has hardened.

[Brief explanation of drawings]

FIG. 1 is a plan view of the sheet material P, and FIG. 2 is a rectangular hole 1 for forming the sheet material P in the concrete wall W.
Figure 3 is a plan view of the sheet material P' cut to a length corresponding to the size of the sheet material P' and the portion corresponding to the corner of the square hole 13 cut out in a V shape. FIG. 4 is a perspective view of the rectangular frame F fixed to the formwork 11a, and FIG. The bottom plate part 1 of P′ is attached to the formwork 11
Figure a shows the state in which the rectangular frame F is fixed to the formwork 11a;
This figure shows that both formworks 11a, 11b are fixed by making contact with each other, and concrete C is poured between both side frames 11a, 11b.The same figure shows that after concrete C hardens, formworks 11a, 11b and square frame F FIG. 5 shows the state in which the formwork 11a is removed and the plate material 14 is interposed between the formwork 11a and the bottom plate part 1 of the rectangular frame F, so that the thickness of the concrete wall is equal to the width of the side plate part 2 of the sheet material P'. 6 is a diagram showing the case where the thickness is thicker than L ₂ , FIG. 6 is a diagram showing a state in which a cross hole 15 is provided in the side plate part 2 of the sheet material P' that constitutes the rectangular frame F, and FIGS. 7 and 8 are respectively Side plate part 2
9 is a perspective view of the temporary frame 31, and FIG. It is a diagram showing a state in which a frame 31 is fixed to a formwork 32 and concrete C is poured between both formworks 32. [Explanation of symbols of main parts], F: square frame, P′,
P: Sheet material, W: Concrete wall, 1: Bottom plate part, 2: Side plate part, 3: Support plate part, 4: Fixed plate part,
5, 6, 7: first bending line, 8: second bending line, 9, 10: cutting line, 11a, 11b: formwork, 12: nail, 13: square hole, 15: cross hole, 1
6: Anchor bolt, 17: Insert.

Claims (1)

[Scope of Claims] 1. A bottom plate portion fixed to the formwork, a side plate portion located perpendicular to the surface of the formwork in an assembled state, and a support plate portion for supporting the force applied to the outside of the side plate portion. , and a fixing plate part for fixing this support plate part to the formwork are provided along the width direction in this order, and a first bending line is provided in the length direction at the boundary of each plate part. In addition, the side plate portion is provided with a second bending line in the width direction, and the other plate portions other than the side plate portion are provided with cutting lines that are inclined from both ends of the second bending line. Characteristic sheet material. 2. A bottom plate part fixed to the formwork, a side plate part located perpendicular to the formwork surface in the assembled state, a support plate part to support the force applied to the outside of this side plate part, and this support plate part. A fixing plate part for fixing to the formwork is provided along the width direction in this order, a first bending line is provided in the length direction at the boundary of each plate part, and a side plate part This method is made by using a sheet material in which a second folding line is provided in the width direction, and cutting lines are provided on the other plate parts except for the side plate parts, which are inclined from both ends of the second folding line. Cut the sheet material corresponding to each corner of the square hole to be formed in the concrete wall into a V-shape along the cutting line, and after fixing the bottom plate of the sheet material to one formwork, make a rectangular cross section with a right triangular shape. One side of the rectangular frame is formed by sequentially bending the other plate parts inward through the first bending line and fixing the fixed plate part to the formwork so as to form one side of the rectangular frame. A rectangle using a sheet material, characterized in that the corner parts of the rectangular frame are formed by bending the side plate parts at right angles through the lines, and the other three sides of the rectangular frame are sequentially formed and assembled and fixed to the formwork. Frame forming method.