JPH0157220B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a formwork for pouring concrete, etc. used when manufacturing manholes etc. from concrete etc., and is for embedding steps in the wall surface of the manhole.

[Background technology]

Conventionally, as shown in FIGS. 1a, b, and c, a pair of stepsetters 21 made of styrene are used.
The step setter 21 is press-fitted into the opening window 23 of the formwork main body 22 with the step 1 sandwiched between them, and the formwork main body 22 is erected.After pouring concrete, the step setter 21 is separated and removed, The formwork body 22 was removed by pulling out step 1 from step 23. Therefore, the embedding accuracy of step 1 is not achieved, and there are large variations in the embedding angle of step 1 in the upper, lower, left, and right directions, and the step setter 21 does not fit tightly into the formwork body 22, resulting in unevenness on the concrete surface. The problem was that it was easy to occur.

[Purpose of the invention]

The present invention has been made in view of the drawbacks of the conventional examples described above, and its purpose is to provide a step embedding method that improves the embedding accuracy of steps and allows the step embedding work to be performed using a simple formwork structure. We provide formwork for installation.

[Disclosure of the invention]

In the step embedding mold of the present invention, a pair of side pieces 3 for holding the step 1 from both sides are erected on the upper surface of a support piece 2 for supporting the step 1a of the step 1, A notch 5 for inserting the embedded part 1b of the step 1 is provided in the formwork 4 provided perpendicularly to the support piece 2 on the front surface of the formwork 2, and the mold piece 4 is inserted into the opening window 7 made in the formwork body 6. The mold piece 4 is removably fitted, and the end of the support piece 2 and the end of the side piece 3 are brought into contact with the edge of the opening window 7 to position the mold piece 4 in the form body 6. Thus, we were able to achieve the above objective.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The formwork A is composed of a steel formwork body 6, a steel stepsetter 8, a rubber magnet interposition prevention sheet 9, a presser washer 10, and the like. The form body 6 is curved with a constant curvature, and has a horizontally long opening window 7. A substantially L-shaped receiving piece 11 is fixed to the concave side of the upper edge of the opening window 7. A through hole 12 is bored in the protruding piece 11a of the piece 11. The step setter 8 has a pair of side pieces 3 erected parallel to each other on the upper surface of a horizontal support piece 2, and the support pieces 3 are attached along the front edge of the support piece 2, which is cut to match the curvature of the form body 6. A mold piece 4 is welded perpendicularly to 2. The horizontal dimension of the mold piece 4 is made approximately equal to the horizontal dimension of the opening window 7 so that it fits almost snugly into the opening window 7 of the form body 6, and the interval between the side pieces 3 is equal to the outer width of the step 1. When the step 1a of the step 1 is delivered between the side pieces 3, the step 1 can be positioned on either side of the step 1 with the step 1 in between. The mold piece 4 is provided with a notch 5 through which the embedded portion 1b of the step 1 is inserted.
Further, a through hole 13 is bored in the support piece 2. Further, the left and right sides of the front end of the support piece 2 protrude from the left and right sides of the mold piece 4 to form a contact portion 14, and the front end of the side piece 3 also has an upper portion protruding from above the mold piece 4 to form a contact portion 14. Position the mold piece 4 so that when it is fitted into the opening window 7 of the form body 6, the contact portion 14 comes into contact with the edge of the opening window 7 and the surface of the mold piece 4 and the surface of the form body 6 are flush. I'm starting to be able to do it. 10 is a presser washer for holding down the step 1, and has a protrusion 15 in the center of one side.The presser washer 10 has a length that fits between the side pieces 3 of the step setter 8; The width of step 15 is smaller than the inner width of step 1. Numeral 16 is a tightening bolt with a square washer 17 welded to the head side, and is assembled with a wing nut 19. The gap prevention sheet 9 is larger than the vertical and horizontal dimensions of the opening window 7 of the form body 6, and is provided with an inverted U-shaped notch 18 for inserting the embedded part 1b of the step 1 from the bottom upward. . Although the step 1 is shown as having a substantially U-shape with an L-shaped tip, the step 1 is not limited to such a shape.

Next, how to use this formwork A will be explained. First, place the step 1 between the side pieces 3 of the step setter 8.
Place the presser washer 10 on top of step 1,
Fit the mold piece 4 of the stepsetter 8 into the opening window 7 as it is, position the abutment part 14 in contact with the mold body 6, and insert the presser washer 10 and the receiving piece through the through hole 13 of the support piece 2. A tightening bolt 16 is inserted through the receiving piece 11, and a wing nut 19 is screwed onto the tightening bolt 16 from above the receiving piece 11 to fix the stepsetter 8 to the form body 6 as shown in FIG. Here, the vertical dimension of the opening window 7 is slightly larger than the vertical dimension of the mold piece 4, and can be adjusted up and down according to the thickness of the step 1, and the presser washer 10 can be turned over and pressed. The thickness of the step 1 can also be accommodated by making the portion 15 the upper or lower surface. Furthermore, as shown in FIG. 6, a gap prevention sheet 9 is magnetically attached near the opening window 7 on the mold surface of the form body 6 so as to straddle the step 1.
and the mold piece 4 is closed. In this way, as shown in FIGS. 3 and 4, the step 1 is set on the form body 6 at an angle. What is shown is an example of attachment of the step 1 for the right foot, but if the entire step setter 8, step 1, and presser washer 10 are turned upside down and attached to the form body 6, the step setter 8, step 1, and presser washer 10 can be installed for the left foot. Alternatively, even if the entire formwork A is turned upside down, it will be for the left foot. In this state, formwork A is assembled together with other non-opening (blind) formwork (not shown), concrete 20 is poured as shown in Fig. 5 to form a manhole, and step 1 is completed. Embed in concrete 20. After the concrete 20 has hardened and cured, the step setter 8 and presser washer 10 can be removed from the form body 6 by removing the wing nut 19 and pulling out the tightening bolt 16 as shown in FIG. 20 and step 1, the form body 6 is removed from the frame. Finally, the crack prevention sheet 9 is removed from the concrete 20 to complete the work, and in step 1, the embedded portion 1b is embedded into the concrete 20.
Figures 8a and 8b show the completed manhole.

In the illustrated example, a curved formwork A for a manhole in which steps 1 are installed in two rows has been described, but in the case where steps 1 are provided in one example, the steps 1 are set perpendicularly (straight) to the formwork main body 6. In addition, in the case of a flat wall, the form body 6 is also flat.

〔Effect of the invention〕

Since the present invention is constructed as described above, by bringing the ends of the side pieces and support pieces into contact with the form body, the mold surface of the form body and the mold surface of the mold piece become flush. The step can be positioned as shown in the figure, and the concrete surface can be finished smoothly. Furthermore, the step is positioned on the support piece and sandwiched between the side pieces, and the step can be embedded in the concrete with high precision. It has the advantage that the formwork can be easily set and removed.

[Brief explanation of drawings]

Figures 1a, b, and c are perspective views of a conventional stepsetter and perspective views from the front and rear sides showing how it is attached to the formwork body, and Figure 2 shows an embodiment of the present invention. FIG. 3 is a perspective view from the rear side showing the assembled and set state of the above, FIG. 4 is a perspective view from the front of the same, FIG. 5 is a sectional view of the same, and FIGS. FIG. 7 is a perspective view showing the procedure for removing the formwork after concrete placement, and FIGS. 8a and 8b are a perspective view and a sectional view of the manhole. 1... Step, 1a... Step part, 1b... Embedded part, 2... Support piece, 3... Side piece, 4... Mold piece,
5...notch, 6...form body, 7...opening window.

Claims (1)

[Claims] 1 A pair of side pieces for holding the step from both sides are erected on the upper surface of the support piece for supporting the tread of the step, and the step is attached to a mold piece provided perpendicularly to the support piece on the front surface of the support piece. A notch is provided for the embedded part to be inserted through, and the mold piece is removably fitted into the opening window drilled in the formwork body, and the ends of the support piece and the side pieces are inserted into the opening window. A formwork for embedding a step, characterized in that a mold piece is positioned in a formwork body by bringing it into contact with an edge.