JPH07118974B2 - Concrete product forming equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention provides an embedding member for forming a drainage hole in a concrete product, an embedding member for forming a concrete product lifting hole, and inserts in concrete. The present invention relates to a device for burying and molding a concrete product.

[Prior Art] An example of this type of apparatus is disclosed in Japanese Utility Model Laid-Open No. 56-115210. In this conventional device, a cylindrical rubber body is attached to the tip side of a bolt inserted into a mounting hole penetrating the mold plate, and the cylindrical plate is clamped with a nut from the opposite side to form a columnar rubber body. The rubber body of is expanded and deformed. The burying pipe is supported inside the cylindrical rubber body, and the burying pipe is firmly joined and supported by the rubber body due to the expansion deformation of the rubber body. As a result, the burying pipe is firmly held at the predetermined position even when pouring concrete, and the burying pipe is accurately buried at the predetermined position in the concrete product.

[Problems to be Solved by the Invention] However, in this conventional device, the diameter of the device hole and the diameter of the bolt are substantially the same, and the mold plate in which the bolt is mounted must be moved in parallel in order to remove the mold plate. However, such a removal configuration complicates the configuration for the formwork,
Moreover, both the formwork and removal are laborious tasks.

According to the present invention, a holder made of an elastic body is attached to the tip side of a bolt that is inserted into a mounting hole that is formed through a mold for molding a concrete product, and is expanded and deformed by tightening a nut that is screwed to the bolt. It is an object of the present invention to provide a concrete product forming apparatus which supports a cylindrical embedded member by an inner diameter of the holding body and can easily perform both formwork and removal for the concrete product forming apparatus.

[Means for Solving the Problems] Therefore, according to the present invention, an embedding embedded in solidified concrete that rotatably supports a form plate that penetrates the mounting hole with respect to another form plate. The relative distance between the mounting hole and the bolt, which is determined from the minimum movement distance of the holding body for removing the holding body from the member, the rotation amount of the mold plate that allows this, and the rotation center position of the mold 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.

[Operation] By setting the diameter of the mounting hole to be at least the sum of the relative displacement amount and the diameter of the bolt, the bolt in the middle of removing the holding body from the tubular embedded member can move only along the axis thereof. Yes, the distance from the center of rotation of the formwork plate remains unchanged. Therefore, if the mounting hole has only the diameter of the bolt, the inner diameter of the mounting hole, which is about to rotate about the center of rotation, interferes with the bolt, and the mold plate cannot rotate. That is, the holder cannot be pulled out from the tubular embedded member,
By making the diameter of the mounting hole equal to or more 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 is absorbed by the set diameter of the mounting hole. Therefore,
The mounting hole and the bolt do not interfere with each other, and the holder can be removed from the embedding member even when the form plate is rotated.

[Embodiment] An embodiment in which the present invention is embodied in a U-shaped groove forming apparatus will be described below with reference to Figs.

1 is an inner mold plate, 2 is an outer mold plate,
Is rotatably connected to the form plate 1 via a hinge 3. The mold plate 2 is perpendicular to the horizontal portion 1a of the mold plate 1 in the assembled state of the mold plate, and the shaft 3a of the hinge 3 is positioned inside the mold plate 2.

A mounting hole 4 is formed through the form frame plate 2, and a bolt 5 is inserted into the mounting hole 4. The mounting hole 4 is composed of a large-diameter portion 4a and a semi-arcuate positioning recessed portion 4b recessed in the lower edge thereof, and the bolt 5 is positionally regulated in the positioning recessed portion 4b. The radius of the positioning recess 4b is set to be substantially the same as the radius of the bolt 5, the bolt 5 fits snugly into the positioning recess 4b, and the bolt 5 does not shift from the positioning recess 4b. A pressing disc 6 is fixed to the tip of the bolt 5, and a rubber holder 7 is detachably inserted and supported by the bolt 5 inside. 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 thereof is set to be slightly larger than that of the pressing disc 6.

Reference numeral 8 denotes an embedded member made of synthetic resin, which is formed by fitting and connecting an outer cylinder 8A and an inner cylinder 8B. The outer cylindrical body 8A includes a small diameter portion 8b having a closed end wall 8a and a large diameter portion 8c, and the inner cylindrical body 8B is fitted in the large diameter portion 8c. A flange portion 8d is provided on the outer circumference of the inner cylindrical body 8B, and the minimum length of the embedding 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 holding body 7, and the embedded member 8 is held by the inner diameter support of the inner cylindrical body 8B by the holding body 7.

The embedded member 8 is supported by the holder 7 as follows. After inserting the bolt 5 into the mounting hole 4 so that the holding body 7 is located inside the form frame plate 2, the spacer 9 is inserted outside the form frame plate 2 and the nut 10 is screwed onto the bolt 5. Then, when the embedded member 8 is fitted into the holding body 7, the bolt 5 is positioned in the positioning recess 4b of the mounting hole 4, and the nut 10 is tightened, the holding body 7 is pressed against the inner surface of the form plate 2, 7 is expanded and deformed. The expandable and deformable holder 7 is pressed against the inner circumference of the inner cylindrical body 8B of the embedding member 8, and the embedding member 8 is firmly supported by the holder 7. After attaching the embedding member 8 to the holding body 7, the outer cylinder 8A is appropriately slid with respect to the inner cylinder 8B so that the length of the embedding member 8 is set between the upright portion of the mold plate 1 and the mold plate 2. If the space is set to be equal to or more than the assembling interval, and the mold plate 2 is rotated to assemble, the length of the embedding member 8 matches the assembling interval.

After the concrete cast between the assembled formwork plates 1 and 2 has solidified, in order to remove the holder 7 from the embedding member 8, loosen the nut 10 as shown in FIG. 4 and show it in FIG. As described above, the mold plate 2 must be rotated so that the holder 7 can be pulled out. As shown in FIG. 5, in order to rotate the form plate 2, the diameter of the mounting hole 4, the minimum movement distance of the holding body 7 required to extract the holding body 7 from the state of FIG. There must be a constant relationship between the amount of rotation of the mold plate 2 and the position of the rotation center C of the mold plate 2.

As shown in FIG. 1, the thickness of the holder 7 is x and the center of rotation C is
To the inner surface of the mold plate 2 is L ₁ , the distance from the rotation center C to the outer surface of the mold plate 2 is L ₂ , and a reference line 1 passing through the rotation center C (right angle to the mold plate 2 From the positioning recess 4b
Distance L ₃ to the bottom, the distance from the reference line l to the top of the large-diameter portion 4a L _4, the rotation center C from the corner portion p ₁ of the holding member 7 drawn at a minimum travel distance from embedded member 8 The distance to y,
The angle from the intersection point p ₂ of the arc C _{1 of} radius z centering on the center of rotation C and the inner surface of the mold plate ₂ to the corner p ₁ is α, and the upper edge of the large diameter portion 4 a and the mold plate 2 are The distance from the intersection point p ₃ with the outer surface to the rotation center C is z, the movement point at which the intersection point p ₃ is rotated about the rotation center C by the angle α is p ₄ , the movement point p ₄ and the large diameter portion 4a. The distance from
Assuming that the angle formed by the line connecting the intersection point p ₃ and the center of rotation C and the reference line 1 is β, the diameter of the bolt 5 is D, and the diameter of the holder 7 is R, equations (1), (2), ( 3), (4), (5), and (6) are obtained.

(L ₄ -w) ² + z ² cos ² (β-α) = z ² ... (1) z ² = L ₂ ² + L ₄₂ ... (2) (L ₁ + x) ² + [L ₄ -w- (D + R) / 2] ² = y ² (3) w ² + [zcos (β-α) -L ₂ ] ² = 2z ² (1-cosα)
·· (4) y ² = _{[L 3 - (R-D)} / 2 ] _{^{2 + (L 1 + x)}} 2 ··· (5) β = tan -1 (L 4 / L 2) ··· (6) There are six variables α, β, y, z, w, and L ₄ , and the minimum movement distance x and distance for pulling out the holder 7 from the embedded member 8 are
6 by setting the values of L ₁ , L ₂ , L ₃ and diameters D, R
The distance w can be determined from the two equations (1) to (6). The distance w is a relative displacement position between the bolt 5 and the mounting hole 4 corresponding to the rotation angle α of the form plate 2 which allows the minimum movement distance x for pulling out the holding body 7 from the embedding member 8. The value (w + D) obtained by adding the distance w to the bolt diameter D is the mounting hole 4
Diameter in the up-down direction, that is, the bottom edge of the positioning recess 4b and the large-diameter portion 4a
The holding body 7 can be extracted from the embedding member 8 without causing interference between the mounting hole 4 and the bolt 5 which rotate by setting the distance to the upper edge. Therefore, when removing the formwork after solidification of concrete, loosen the nut 10 to the position shown in FIG. It is very easy to pull out and remove the formwork.

In this embodiment, since the bolt 5 is fitted in the semicircular positioning recess 4b so as not to be displaced, the position of the holding body 7 is always held at a fixed position with respect to the rotation center C. Bolt 5
Is located at another position deviated from the positioning recess 4b, the mounting hole 4 cannot absorb the relative displacement amount between the mounting hole 4 and the bolt 5 when the mold plate 2 is rotationally removed. During extraction of the holding body 7, the bolt 5 and the mounting hole 4 interfere with each other, and the holding body 7 cannot be extracted from the embedding member 8. However, in this embodiment, since the bolt 5 is always positioned at the fixed position, that is, the positioning recess 4b, there is no possibility that the holder 7 cannot be pulled out.

After pulling out the holder 7 from the embedding member 8, by breaking the closed end wall 8a of the inner cylindrical body 8B, a drainage hole of a U-shaped groove is formed.

The present invention is of course not limited to the above-mentioned embodiment, and the embodiments shown in FIGS. 6 to 8 are also possible.

Both sides of the form plate 11 of this embodiment have an expanded shape,
The hinge 3 that rotatably connects the form plate 12 to 11 is outside the form plate 12. Therefore, the mounting hole 13 on the mold frame plate 12 first moves upward with the rotation and separation of the mold frame plate 12, and then moves downward. The mounting hole 13 is composed of a large-diameter portion 13a and a positioning recess 13b recessed in the upper edge thereof, and the wedge-shaped spacers 14 and 15 welded to both inner and outer surfaces of the form plate 12 have similar mounting holes 14a and 15a. Is provided. The bolt 5 is positioned in each of the positioning recesses 13b of the mounting holes 13, 14a, 15a, and the spacers 14, 15 are wedge-shaped.
The nut 10 is tightened via the. One end of the embedded member 16 attached to the holder 7 is formed as an inclined surface, and the inclination angle of this inclined surface is substantially equal to the inclination angle of the form plate 12.

Also in this embodiment, similarly to the above-mentioned embodiments, the thickness of the holding body 7 is x, the distance from the rotation center C to the outer surface of the mold plate 2 is L ₂ , and the reference line 1 passing through the rotation center C (form plate). the distance to the bottom of the positioning recess 4b from perpendicular to 2) L _3, the distance from the reference line l to the top of the large-diameter portion 4a L _4, drawn from embedded member 8 at the minimum moving distance x The distance from the corner portion p ₁ of the holding body 7 to the center of rotation C is y, and the intersection point P ₂ between the arc C _{1 of} radius z centered on the rotation center C and the inner surface of the form plate ₂ to the corner portion P ₁ Up to α, the distance from the intersection point p ₅ of the lower edge of the mounting hole 14a and the outer surface of the spacer 14 to the rotation center C is z, and the intersection point p ₅ is rotated about the rotation center C by the angle α. The moving point is p ₄ , the distance between the moving point p ₄ and the large diameter portion 4a is w, the angle between the line connecting the intersection point p ₃ and the rotation center C and the reference line 1 is β, and the diameter of the bolt 5 is D,
Assuming that the diameter of the holder 7 is R, equations (7), (8),
(9), (10), (11) and (12) are obtained.

(L ₃ + w) ² (1 + tan ² [π / 2- (α + β)] = z ² ...
^{_{(7) L 3 2 + L}} 2 2 = z 2 ··· (8) (L 2 -x) 2 + _{[L 4 - (D + R)} / 2 ] ^{2 = y 2 ··· (9)} [L ₂₋ (L ₃ + w) tan (π / 2−α−β)] ² + w ² = 2z ²
(1-cosα) ・ ・ ・ (10) 2y ² (1-cosα) −x ² = [L ₄ − (D + R) / 2− (y ² −L ₂ ² ) 1/2] ²・ ・ ・ (11 ) Β = tan ⁻¹ (L ₃ / L ₂ ) ... (12) The relative displacement position w between the mounting hole 13 and the bolt 5 is the same as in the above-mentioned embodiment according to the six equations (7) to (12). Then, the diameter (d + w) of the mounting hole 13 can be determined.

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

Furthermore, the present invention can be implemented as shown in FIG. In this embodiment, a positioning protrusion 2a having a diameter substantially equal to the inner diameter of the inner cylindrical body 8B of the embedding member 8 is provided in the inner surface area including the mounting hole 4, and the inner cylindrical body 8B should be fitted into the positioning convex portion 2a. By this, the mounting position of the embedded member 8 is always specified as a fixed position. The position of the bolt 5 that supports the positioned embedded member 8 is also inevitably specified, and the mounting hole 4 is placed at a position where interference does not occur between the bolt 5 and the mounting hole 4 on this specific position due to relative displacement. If set, the holder 7 can be smoothly extracted from the embedding member 8.

Further, as shown in FIG. 9, the stopper nut 18 is screwed into the bolt 5 so that the loosened position of the nut 10 can be seen, and the nut 10 is loosened until it comes into contact with the stopper nut 18, so that the holding body 7 is pulled out. Work becomes easier.

In addition, the diameter of the mounting holes 4 and 13 in each of the above-described embodiments is (D +
Of course, it may be w or more, and the shape of the mounting hole may be a long hole having a width substantially equal to the bolt diameter.

Further, the present invention can be applied to an apparatus for embedding and embedding an embedding member that forms a concrete product lifting hole in a concrete product.

[Effects of the Invention] As described in detail above, the present invention provides a minimum movement distance of a holding body for extracting a holding body from an embedding member embedded in solidified concrete, and a rotation amount of a mold plate that allows this. Since the value of the relative displacement between the mounting hole and the bolt, which is determined by the rotation center position of the mold plate, and the diameter of the bolt is added as the minimum diameter of the mounting hole, The relative displacement between the bolt and the mounting hole is absorbed by the mounting hole having the set diameter even when the formed form plate is rotated, so that the embedded member can be removed without causing interference between the bolt and the mounting hole. It has an excellent effect that the holder can be smoothly extracted.

[Brief description of drawings]

1 to 5 show an embodiment embodying the present invention.
The figure is a vertical cross-sectional view before inserting the bolt, FIG. 2 is an exploded perspective view, FIG. 3 is a vertical cross-sectional view showing a state where concrete is placed, and FIG. 4 is a vertical cross-sectional view showing a state in which a nut is loosened. FIG. 5 is a vertical cross-sectional view showing a state in which the form plate is tilted, FIGS. 6 to 8 show another example, FIG. 6 is a vertical cross-sectional view before inserting a bolt, FIG. 7 is an exploded perspective view, and FIG. Is a longitudinal sectional view showing a state in which the form plate is tilted, and FIG. 9 is a longitudinal sectional view showing still another example. Form plate …… 1,2,11,12, mounting hole …… 4,13, bolt ……
5, retainer …… 7, buried member …… 8,16, nut …… 10.

Claims (1)

[Claims] 1. A holder (7) made of an elastic body is provided at the tip end side of a bolt (5) inserted into a mounting hole (4, 13) penetrating a form plate (2) for molding a concrete product. Cylindrical embedding member (8, 16) by holding body (7) that expands and deforms by mounting and tightening nut (10) screwed to bolt (5)
In a concrete product forming apparatus for supporting an inner diameter of a mold, concrete which is rotatably supported with respect to another mold plate (1) by a mold plate (2) penetrating the mounting holes (4, 13) is solidified. The minimum movement distance (x) of the holding body (7) for removing the holding body (7) from the embedded member (8, 16) embedded in the (17) and the form plate (2) which allows this Rotation amount (α)
And the relative displacement amount (w) between the mounting hole (4, 13) and the bolt (5) determined from the rotation center (C) position of the form plate (2) and the diameter of the bolt (5). The sum of (D) and the mounting hole (4,1
Concrete product forming equipment characterized by having a minimum diameter of 3).