JPH0355208A - Molding apparatus for concrete article - Google Patents

Abstract

PURPOSE:To enable a supporter to be extracted smoothly from a buried member by making the value, in which the diameter of a bolt is added to the minimum transfer distance of the supporter for extracting the supporter from the buried member, the rotatary degree of a mold frame board for allowing the minimum transfer distance, and relative displacement degree between an attaching hole and bolt, into a minimum diameter of the attaching hole. CONSTITUTION:A mold frame board 2 having an attaching hole 4 is supported rotatably with respect to another mold frame board 1, and the sum of relative displacement degree between the attaching hole 4 and bolt 5 which is determined by the minimum transfer distance of a supporter 7 for extracting the supporter from a buried member 8 embedded in hardened concrete 17, the rotatary degree of a mold frame board 2 for allowing the minimum distance, and the rotatary center position of the mold frame board 2, and the diameter of the bolt 5 is made into a minimum diameter of the attaching hole 4. Accordingly, relative rotating displacement of the bolt with respect to the attaching hole 4 is absorbed by the set diameter of the attaching hole 4. Whereby, without interfering the attaching hole 4 and bolt 5 with each other, the supporter 7 can be extracted from the buried member 8 even in the rotating mechanism of the mold frame board 2.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a buried member for forming a drainage hole in a concrete product, a buried member for forming a hole for lifting a concrete product, and an insert. } 1 in concrete to form concrete 1/products.

[Prior Art] An example of this type of device is disclosed in Japanese Utility Model Application Publication No. 115210/1983. In this conventional device, a cylindrical rubber body is attached to the tip of a bolt that is inserted into a mounting hole penetrated through the formwork plate, and by tightening a nut from the opposite side across the formwork plate, the cylindrical The rubber body expands and deforms. An embedding vibrator is supported on the inner diameter of the cylindrical rubber body, and the embedding pipe is firmly connected and supported by the rubber body as the rubber body expands and deforms. As a result, the buried pipe is firmly held in a predetermined position even during concrete pouring, and the buried pipe is accurately buried in a predetermined position within the concrete product.

[Problems to be Solved by the Invention] However, in this conventional device, the diameter of the mounting hole and the diameter of the bolt are approximately the same, and in order to remove the formwork plate to which the bolt is attached, the formwork plate must be moved in parallel. However, in such a removal structure, the structure for the mold framework becomes complicated,
Moreover, both forming and removing the formwork are troublesome work.

The present invention involves attaching a holder made of an elastic body to the tip side of a bolt that is inserted into a mounting hole penetrated through a formwork for forming concrete products, and expanding and deforming the bolt by tightening a nut screwed onto the bolt. The object of the present invention is to provide a concrete product forming apparatus which can easily perform both the formwork and removal, with the object being a concrete product forming apparatus in which a cylindrical buried member is supported on the inner diameter by a holder.

[Means for Solving the Problems] To this end, in the present invention, the formwork plate having the installation hole penetrated therein is rotatably supported with respect to other formwork plates, and the formwork plate embedded in the solidified concrete is The relative relationship between the mounting hole and the bolt determined from the minimum travel distance of the holder to remove the holder from the member, the amount of rotation of the formwork plate that allows this, and the center of rotation of the formwork plate. The value obtained by adding the diameter of the bolt to the amount of displacement was taken as the minimum diameter of the mounting hole.

[Function] By setting the diameter of the mounting hole to at least the sum of the relative displacement amount and the diameter of the bolt, the bolt can only move along its axis while the holder is being removed from the cylindrical buried member. The distance from the center of rotation of the formwork plate remains unchanged. Therefore, if the mounting hole is only about the diameter of a bolt, the bolt will interfere with the inner diameter of the mounting hole that is about to rotate about the rotation center, making it impossible for the form plate to rotate. That is, although it is not possible to remove the holder from the cylindrical buried member, by making the diameter of the mounting hole larger than the sum of the relative displacement amount and the bolt diameter, the relative rotational displacement of the bolt with respect to the mounting hole can be adjusted. It is absorbed by the predetermined diameter of the hole. Therefore, there is no interference between the mounting holes and the bolts, and the holder can be removed from the buried member even when the form plate is rotated.

Embodiment] Hereinafter, an embodiment in which the present invention is embodied in a forming apparatus for a U-shaped groove will be described based on FIGS. 1 to 5.

1 is an inner formwork board, 2 is an outer formwork board, and formwork board 2
is rotatably connected to the form plate 1 via a hinge 3. The formwork plate 2 is perpendicular to the horizontal part 1a of the formwork plate l when the formwork is assembled, and the axis 3a of the hinge 3 is aligned with the formwork plate 2.
It is now located on the inside.

A mounting hole 4 is provided through the form plate 2, and a bolt 5 is inserted into the mounting hole 4. The mounting hole 4 includes a large diameter portion 4a and a semicircular positioning recess 4b formed in the lower edge of the large diameter portion 4a, and the position of the bolt 5 is regulated by the positioning recess 4b. The radius of the positioning recess 4b is set to be substantially the same as the radius of the bolt 5, and the bolt 5 fits snugly into the positioning recess 4b, so that the bolt 5 does not shift from the positioning recess 4b. A presser disk 6 is fixed to the tip of the bolt 5, and a rubber holder 7 is removably attached to the inside of the bolt 5.
It is inserted and supported by. The inner diameter of the holding body 7 is set to be slightly larger than the diameter of the bolt 5, and the outer diameter is set to be slightly larger than the holding disc 6.

Reference numeral 8 denotes an embedded member made of resin, which is constructed by fitting and connecting an outer cylinder 8A and an inner cylinder 8B. Outer cylinder body 8
A consists of a small diameter part 8b having a closed end wall 8a and a large diameter part 8C, and the inner cylinder 8B is fitted into the large diameter part 8C. A flange portion 8d is provided on the outer periphery of the inner cylinder 8B,
The minimum length of the buried member 8 is defined by the flange portion 8d.

The inner diameter of the inner cylindrical body 8B is set to be slightly larger than the outer diameter of the holder 7, and the embedded member 8 is held by the holder 7 supporting the inner diameter of the inner cylindrical body 8B.

The embedded member 8 is supported by the holder 7 as follows. The mounting holes 4 are arranged so that the holder 7 is located inside the formwork plate 2.
After inserting bolts 5 into
, and screw the nant 10 onto the bolt 5. Then, after fitting the embedded member 8 into the holding body 7 and positioning the bolt 5 in the positioning recess 4b of the mounting hole 4, the nut lO
When tightened, the holder 7 is pressed against the inner surface of the form plate 2, and the holder 7 is expanded and deformed. This expanding and deforming holding body 7
is pressed against the inner periphery of the inner cylindrical body 8B of the buried member 8, and the buried member 8 is firmly supported by the holder 7. After attaching the embedded member 8 to the holder 7, the outer cylindrical body 8A is appropriately slid relative to the inner cylindrical body 8B to adjust the length of the embedded member 8 between the vertical part of the form plate l and the form plate 2. If the length of the embedded member 8 is set equal to or longer than the assembly interval and the form plate 2 is rotated and assembled, the length of the buried member 8 will be equal to the assembly interval.

After the concrete poured between the assembled formwork plates 1.2 has hardened, to remove the holder 7 from the buried member 8, loosen the nut 10 as shown in FIG. 4, and then loosen the nut 10 as shown in FIG. The form plate 2 must be rotated in such a manner that the holder 7 can be pulled out. As shown in Figure 5, the formwork plate 2
The diameter of the mounting hole 4, the minimum movement distance of the holder 7 necessary to extract the holder 7 from the state shown in FIG. 3, the amount of rotation of the form plate 2 corresponding to this movement, and the mold There must be a certain relationship between the positions of the rotation center C of the frame plate 2.

As shown in Fig. 1, the thickness of the holder 7 is X, the rotation center C
The distance from L. to the inner surface of the formwork board 2. , the distance from the rotation center C to the outer surface of the form plate 2 is L2, and the distance from the reference line β passing through the rotation center C (perpendicular to the form plate 2) to the bottom of the positioning recess 4b is L3. , the distance from the reference line l to the top of the large diameter portion 4a is L4, and the rotation center C from the corner p1 of the holder 7 pulled out from the buried member 8 with the minimum movement distance.
y, the angle from the intersection p2 of the arc C1 of radius 2 centered on the rotation center C and the inner surface of the formwork plate 2 to the corner pi is α, and the angle between the upper edge of the large diameter portion 4a and the formwork The distance from the intersection p3 with the outer surface of the plate 2 to the rotation center C is 2, the moving point where the intersection p3 is rotated by an angle α around the rotation center C is p4, and the moving point p4 and the large diameter portion 4a are Let the angle between the line connecting w1 intersection p3 and rotation center C and reference \TIAE be β, the diameter of bolt 5 be D, and the diameter of holding body 7 be R, then 2(1).
(2), (3), (4), (5). (
6) is obtained.

(+-4 -w) + z 2cos (β - α) Moz2 z2 =L2 2 +L4 2 ・ ・ ・ (1) ・ ・ ・ (2) (Ll +x) 2+(L4 -w-(D+R) /
2) 2=y2・ ・ ・ (3) w2+ (ZCOS(β-α)-L2)" = 2 z
2 (1-cosα)・・・・(4) V2= (L3 (R D)/2) 2+ (L
l +x) 2・ ・ ・ (5) β=Lan − ' (L4 /L2) ・
(6) There are six variables: α, β, yS2% W% L4, and the minimum travel distance to pull out the holding body 7 from the buried member 8! X% distance Ll. By setting the values of L2, L3, and diameters D and H, the distance W can be determined from six equations (1) to (6). The distance W is between the bolt 5 and the mounting hole 4 corresponding to the rotation angle α of the form plate 2 that allows the minimum movement distance 1iiiIx to pull out the holding body 7 from the buried member 8.
This distance W is added to the bolt diameter D (w+D), which is the vertical diameter of the mounting hole 4, that is, the distance between the bottom edge of the positioning recess 4b and the top of the large diameter portion 4a. By setting the distance, the holder 7 can be extracted from the buried member 8 without causing interference between the rotating mounting hole 4 and the bolt 5. Therefore, to remove the formwork after the concrete hardens, loosen the nut I-10 to the position shown in FIG. It is very easy to remove the formwork.

In this embodiment, the bolt 5 has a semicircular arc-shaped positioning recess 4b.
Since the holding body 7 is fitted in such a way that it does not shift, the position of the holding body 7 is always maintained at a constant position with respect to the center of rotation C. If the bolt 5 is located at a different location away from the positioning recess 4b, the relative displacement between the mounting hole 4 and the bolt 5 when the formwork plate 2 is rotated and removed can be absorbed by the mounting hole 4. As a result, the bolt 5 and the mounting hole 4 interfere with each other during extraction of the holder 7, making it impossible to extract the holder 7 from the buried member 8. However, in this embodiment, since the bolt 5 is always positioned at a fixed position, that is, within the positioning recess 4b, there is no possibility that the holder 7 will not be able to be pulled out.

After extracting the holder 7 from the buried member 8, the inner cylinder 8B
By breaking the closed end wall 8a, a U-shaped drainage hole is created.

The present invention is of course not limited to the embodiments described above, and embodiments shown in FIGS. 6 to 8, for example, are also possible.

Both sides of the formwork plate l1 in this embodiment are expanded, and the hinges 3 that rotatably connect the formwork plate 12 to the formwork plate l1 are located on the outside of the formwork plate 12. Therefore, the mounting hole l on the formwork plate 12
3 initially moves upward as the formwork plate l2 rotates apart,
Then it moves downward. The mounting hole 13 consists of a large diameter part 13a and a positioning recess 13b formed in the upper edge of the large diameter part 13a, and
Similar mounting holes 14a and 15a are provided in a wedge-shaped spacer 14.15 that is welded to both the inner and outer surfaces of 2.

The bolts 5 are positioned in the respective positioning recesses 13b of the mounting holes 13, 14a, 15a, and wedge-shaped spacers 14.
The nut 10 is tightened via the nut 15. One end of the buried member 16 attached to the holder 7 is formed into an inclined surface, and the angle of inclination of this inclined surface is approximately equal to the angle of inclination of the form plate l2.

In this embodiment, as in the previous embodiment, the thickness of the holder 7 is X, the distance from the rotation center C to the outer surface of the form plate 2 is L2,
The distance from the reference line 12 (perpendicular to the form plate 2) passing through the rotation center C to the bottom of the positioning recess 4b is L3,
The distance from the reference &%f to the top of the large diameter part 4a is L4, the distance from the corner p1 of the holding body 7 pulled out from the buried member 8 by the minimum moving distance plfix to the rotation center C is y, the rotation center The angle from the intersection p2 of the arc C1 of radius 2 centered at C and the inner surface of the formwork plate 2 to the corner p1 is α, and the mounting hole 14a
The distance from the intersection p5 between the lower edge of the spacer 14 and the outer surface of the spacer 14 to the rotation center C is 2, and the moving point where the intersection p5 is rotated by an angle α around the rotation center C is p4, and the moving point p4 is large. The distance to the diameter portion 4a is W, the angle between the line connecting the intersection p3 and the center of rotation C and the reference line l is β, the diameter of the bolt 5 is D, and the holder 7
If the diameter of is R, then 2 (7), (8), (9)
, (1 0), (11), (12) are obtained.

(L3 +W) 2(1+tan 2 (π/2-(α
+β)] = 22 ・ ・ ・ (7) L3 2 +L22 = 22 ・ ・ ・ (8) (L
2 −x) 2 + (L4 − (D+R)
/2) 2 =y2(9) [L2 (L3 +w) tan (yr/
2-ot-β)]2+w2= 2z 2(1-cos
α)(1 0) 2y2(1 −cos α)−x2 = (L4 − (D+R)/2−(y2 −L2
” ) Miyabi) 2 (1 1) β=tan ”” (La /L2) ・・・(
1 2) The mounting hole 13 is determined by the six equations (7) to (12).
The relative displacement amount W between the bolt 5 and the bolt 5 can be determined in the same manner as in the embodiment described above, and the diameter (d+w) of the mounting hole 13 can be determined.

Also in this embodiment, the position of the bolt 5 is regulated by the positioning recess 13b, so that the holding body 7 can be smoothly removed after the concrete has solidified.

Furthermore, the present invention can also be implemented as shown in FIG. In this embodiment, a positioning convex portion 2 approximately equal to the inner diameter of the inner cylindrical body 8B of the embedded member 8 is provided on the inner surface area including the mounting hole 4.
a is provided, and a convex portion 2a is provided for positioning the inner cylinder 8B.
By fitting into the embedding member 8, the mounting position of the embedded member 8 is always specified at a fixed position. The position of the bolt 5 that supports this positioned buried member 8 is also necessarily specified. If the mounting hole 4 is set at a position where relative displacement between the bolt 5 and the mounting hole 4 at this specific position does not cause interference between the two, the holding body 7 can be smoothly extracted from the buried member 8. Also, as shown in FIG. 9, a stopper nut 18 is screwed onto the bolt 5 so that the loosening position of the nant 10 can be determined.
If the nut 10 is loosened to a position where it abuts the stopper nut 18, the work of extracting the holder 7 becomes easier.

In addition, the diameter of the mounting hole 4.13 in each of the above embodiments is CD
+W) or more, of course, and the shape of the mounting hole can also be made into a long hole shape with a width approximately equal to the bolt diameter.

Furthermore, the present invention is also applicable to an apparatus for embedding and forming an insulating member in a concrete product to form a hole for lifting a concrete product.

[Effects of the Invention] As detailed above, the present invention provides the minimum travel distance of the holder to extract the holder from the buried member buried in solidified concrete, and the amount of rotation of the form plate that allows this. The minimum diameter of the mounting hole is determined by adding the diameter of the bolt to the amount of relative displacement between the mounting hole and the bolt determined from the center of rotation of the formwork plate. The relative displacement between the bolt and the mounting hole is absorbed by the mounting hole of the set diameter even when the formwork plate is rotated. This has an excellent effect in that the holding body can be pulled out smoothly.

[Brief explanation of drawings]

1 to 5 show embodiments embodying the present invention;
The figure is a longitudinal sectional view of the bolt insertion piece, Fig. 2 is an exploded perspective view, and Fig. 3 is a longitudinal sectional view showing the state in which concrete is poured.
Figure 4 is a cross-sectional view of the fir showing the state in which the nant is loosened, Figure 5 is a longitudinal cross-sectional view showing the formwork plate in the tilted state, Figures 6 to 8 show other examples, and Figure 6 is a simplified bolt insertion. 7 is an exploded perspective view, FIG. 8 is a longitudinal sectional view showing the form plate in a tilted state, and FIG. 9 is a longitudinal sectional view showing another example. Formwork plates 1, 2, 11, 12, mounting holes 4. l3, bolt 5
, holding body 7, buried members 8, 16, Naso l-100

Claims (1)

[Claims] 1. A holder (7) made of an elastic body is attached to the tip side of a bolt (5) that is inserted into a mounting hole (4, 13) provided through a form plate (2) for forming a concrete product, and the bolt ( 5
) The cylindrical buried member (8, 16) is expanded and deformed by the holding body (7) which expands and deforms when the nut (10) is tightened.
In a concrete product forming device that supports the inner diameter of a concrete product, a form plate (2) having the mounting holes (4, 13) formed therethrough is rotatably supported with respect to another form plate (1), and the solidified concrete (17) The minimum movement distance (x) of the holder (7) in order to extract the holder (7) from the buried members (8, 16) buried in The amount of relative displacement (w) between the mounting hole (4, 13) and the bolt (5) determined from the amount of rotation (α) and the position of the center of rotation (C) of the formwork plate (2) and the bolt A concrete product forming apparatus characterized in that the sum of (5) and the diameter (D) is the minimum diameter of the mounting holes (4, 13).