JPH0521366Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention is a concrete mold used for manufacturing concrete blocks, forming grooves and holes in concrete walls, and drilling through holes in concrete walls. Regarding.

Conventional technology Paper or paper-based composite materials have traditionally been used to reduce costs as a means of manufacturing concrete blocks, forming grooves and holes in concrete walls, and drilling through holes in concrete walls. It has been considered to use a mold made of a cylinder.

Problems that the invention aims to solve: Conventional molds made of paper or paper-based composite materials lack strength, so they deform when pouring concrete, making it difficult to obtain concrete blocks of desired dimensions. The problem is that there is no. Another problem is that water seeps into the paper from the edges, further reducing the strength of the mold and causing it to become more deformed or torn.

The purpose of this invention is to provide a concrete mold that solves the above problems.

Means for Solving the Problems The concrete mold according to this invention has a cylindrical body made of paper or a composite material mainly made of paper, and a body end protection ring attached to at least one of both ends of the body. The body end protection ring is provided with a body clamping part having a U-shaped cross section, the end of the body is clamped by the body clamping part of the ring, and the ring is cut into the body end protection ring. At least one of a score line for breaking at least a part of the body clamping portion of the ring and a score line for weakening the clamping force on the body is formed.

As the paper body, one made of strong single-layer cardboard, one made of two or more layers of cardboard, etc. are used. As the cardboard, it is preferable to use paperboard, paper tube base paper, or the like. In addition, in the case of a paper cylinder, at least the inner peripheral surface of the entire cylinder should be surface-treated with paraffin, wax, etc. in order to impart waterproofness and mold release properties to the inner peripheral surface. Good.

A composite material body mainly made of paper has a core made of paper, a lining that covers the entire inner circumferential surface of the core and is bonded to the inner circumferential surface of the core with adhesive, and the entire outer circumferential surface of the core. A material consisting of an outer layer that covers the core and is bonded to the outer peripheral surface of the core with adhesive is used. The core consists of one or more layers of cardboard. As the lining, synthetic resin-coated paper, synthetic resin-coated aluminum (including aluminum alloy; the same shall apply hereinafter) foil or thin plate, water-repellent-impregnated paper, etc. are used. In the case of synthetic resin-coated paper and synthetic resin-coated aluminum foil or thin plate, the synthetic resin coating layer is placed on the inner surface of the body. In the case of synthetic resin-coated aluminum foil or thin plate, it is preferable to previously adhere kraft paper or the like to the outer surface of the body for adhesion to the core. As the outer lining, the same material as the inner lining is used. However, in the case of synthetic resin-coated paper and the same aluminum foil or thin plate, the synthetic resin coating layer is placed on the outer surface of the cylinder.

Even in the case of a cylinder made of a composite material mainly made of paper, it is preferable to perform a surface treatment using paraffin, wax, etc. in order to impart releasability to the surface.

The concrete mold of this invention prevents deformation during pouring of concrete due to the action of the body end protection ring. Furthermore, water is prevented from seeping into the paper that constitutes the body from the end when pouring concrete.

Also, after the concrete has hardened, the ring is cut along with the ring cutting score line when the shell is removed by breaking it. Alternatively, by breaking at least a part of the body clamping part of the ring to weaken the clamping force on the body, the body clamping part is broken from the score line, the ring is removed from the body, and then the body is broken. Remove the torso.

Embodiments Hereinafter, embodiments of this invention will be described with reference to the drawings. The same parts and parts are denoted by the same reference numerals throughout the drawings, and their explanation will be omitted.

Example 1 This example is shown in FIGS. 1 and 2, in which the mold of this invention was applied to a form for manufacturing concrete strength test specimens.

In FIG. 1, a formwork 1 for manufacturing a concrete strength test specimen includes a cylindrical body 2 made of a composite material mainly made of paper, a metal body end protection ring 3 attached to the upper end of the body 2, A metal bottom cover 5 having a U-shaped cross-section clamping part 4 that clamps the body 2 on its periphery and is attached to the lower end of the body 2 to close the lower end opening; The bottom cover removal band 7 includes a plastic reinforcing plate 6 that is movably fitted and received by the bottom cover 5, and a plastic bottom cover removal band 7 provided on the outer surface of the lower end of the body 2.
The lower end of the body 2 and the bottom cover removal band 7 are both fitted into the clamping part 4 and clamped so that the upper part thereof protrudes.

The body 2 includes a cylindrical core 10 made of a spirally wound paperboard strip 9, and a cylindrical core 10 made of a spirally wound paperboard 9.
A lining 11 that covers the entire inner circumferential surface of the core body 10 and is bonded to the inner circumferential surface of the core body 10 with an adhesive (not shown); It consists of an outer covering 12 adhered to the outer peripheral surface of the body 10 with an adhesive (not shown). The side edges of the strip-shaped paperboard 9 in the cylindrical core body 10 are butted against each other. The inner lining 11 is made of aluminum foil, a plastic film laminated on the inner surface of the aluminum foil, and kraft paper laminated on the outer surface of the aluminum foil. The outer lining 12 is made of kraft paper whose outer surface side of the body 2 is coated with a synthetic resin such as pine to make it waterproof.

The trunk end protection ring 3 has a vertical U-shape with transverse sides, and the entire body serves as a trunk clamping part 14. By clamping the upper end of the trunk 2 with the trunk clamping part 14, the upper end of the trunk 2 can be secured to the upper end of the trunk 2. installed. An inward folded portion is provided at the tip of the outer wall 14a of the trunk end protection ring 3. The body end protection ring 3 has a score line 16 for cutting across the ring 3.
are formed at predetermined intervals in the circumferential direction.

An inwardly folded portion is also provided at the tip of the outer wall of the clamping portion 4 of the bottom cover 5.

FIG. 2 shows the manufacturing process of a specimen using the mold 1 described above.

To manufacture a specimen, first, paraffin is applied to the inner peripheral surface of the formwork 1, and then concrete is poured into the formwork 1 (see FIG. 2a), and the concrete is allowed to harden naturally. Next, the top surface of the concrete is finished flat (capping).

Thereafter, the formwork 1 is turned upside down, and the band 7 is removed from the clamping part 4 by pulling the part of the band 7 protruding outward from the clamping part 4 with a tool or the like. The clamping force is weakened and the bottom cover 5 is removed from the body 2 (see Figure 2b).

Then, the body 2 is torn in a spiral in the direction opposite to the winding direction of the paperboard strip 9. Body 2, ring 3
If you tear it all the way to the end where ring 3 is attached,
is the score line 1 closest to the end of the torn body 2.
6, the ring 3 is cut in the transverse direction (see FIG. 2c). In this way, the trunk 2 is removed,
Specimen A is taken out.

Example 2 This example is shown in FIGS. 3 and 4, in which the mold of this invention was applied to a form for manufacturing concrete strength test specimens.

In FIG. 3, a cylinder end protection ring 21 attached to the upper end of the cylinder 2 of the formwork 20 has a ring 2
Instead of the score line 16 for cutting the body 1, a score line 22 is formed for breaking a part of the body clamping part 14 and weakening the clamping force on the body 2.
This point is a difference from the first embodiment described above. The score line 22 extends upward from the lower end of the outer wall 14a of the clamping part 14, extends in the circumferential direction, and extends almost all the way around the circumference. Clamping portion 14 at score line 22
The portion extending upward from the lower end of the outer wall 14a is designated as 22
It is indicated by a, and the portion extending in the circumferential direction is indicated by 22b. Furthermore, a tab 23 is provided in a downwardly protruding manner at a portion of the outer wall 14a of the clamping portion 14 that is sandwiched between both portions 22a, 22b of the score line 22. Furthermore, on the inner wall 14b of the torso clamping part 14,
A plurality of slits 24 are formed from the lower end at predetermined intervals in the circumferential direction.

FIG. 4 shows the manufacturing process of a specimen using the mold 20.

To manufacture the specimen, first, the upper surface of naturally hardened concrete was finished flat (capping) in the same manner as in Example 1, and then the tab 23 was pinched and pulled outward in the radial direction, and then the circumferential direction to break the outer wall 14a of the clamping portion 14 from the score line 22 (see FIG. 4a). Then,
The clamping force of the clamping portion 14 against the barrel 2 becomes weaker, and when the tab 23 is further pulled upward, the ring 3 is removed from the barrel 2 (see FIG. 4b).

Thereafter, in the same manner as in Example 1, the bottom cover 5 is removed and the body 2 is torn spirally in the opposite direction to the winding direction of the paperboard strip 9 to take out the specimen A.

Example 3 This example is shown in FIGS. 5 and 6, in which the mold of this invention was applied to a form for manufacturing concrete strength test specimens.

In FIG. 5, the score line 22 of the trunk end protection ring 21 attached to the upper end of the trunk 2 of the formwork 20
The tab 23 of the circumferentially extending portion 22b in
The end on the side opposite to the side where there is extends upward, crosses the connecting wall 14c between the inner and outer side walls 14b and 14a of the body clamping part 14, and further extends to the lower end of the inner wall 14b. This extension is designated 22c.
Furthermore, no slit 24 is formed in the inner wall 14b of the trunk clamping part 14. These points are the differences from the second embodiment described above.

FIG. 6 shows the manufacturing process of a specimen using the above mold.

To manufacture the specimen, first, the upper surface of naturally hardened concrete was finished flat (capping) in the same manner as in Example 1, and then the tab 23 was pinched and pulled outward in the radial direction, and then the circumferential The outer wall 14a of the clamping part 14 is pulled in the direction of the score line 2.
2 (see Figure 6a). Then, the ring 21, which is pulled in the circumferential direction while further pulling the tab 23 upward, is removed from the shell 2 (see FIG. 6b).

Thereafter, in the same manner as in Example 1, the bottom cover 5 is removed and the body 2 is torn spirally in the opposite direction to the winding direction of the paperboard strip 9 to take out the specimen A.

Example 4 This example is shown in FIGS. 7 and 8, in which the mold of this invention was applied to a form for manufacturing concrete strength test specimens.

In FIG. 7, a cylinder end protection ring 26 attached to the upper end of the cylinder 2 of the formwork 25 has a ring 2
One score line 16 for cutting 6 is formed. Further, a score line 27 is formed at a predetermined interval from the score line 16 in the circumferential direction, extending from the lower end of the outer wall 14a of the body clamping part 14 to the center of the width of the connecting wall 14c. Score line 27 is trunk 2
This is to weaken the clamping force against the Then, tab 2 is placed between both score lines 16 and 27.
8 is provided in a downwardly protruding shape. These points are the differences from the first embodiment.

FIG. 8 shows the manufacturing process of a specimen using the mold 1 described above.

To manufacture the specimen, first, the upper surface of the naturally hardened concrete was finished flat (capping) in the same manner as in Example 1, and then the tab 28 was pinched and pulled upward, starting from one score line 16. At the same time as the ring 26 is broken, the outer wall 14a and the connecting wall 14c of the body clamping part 14 are broken at the other score line 27 (see FIG. 8a). Then, the clamping force of the clamping portion 14 against the shell 2 becomes weaker, and when the tab 28 is further pulled upward and circumferentially, the ring 26 comes off from the shell 2 (see FIG. 8b).

Thereafter, in the same manner as in Example 1, the bottom cover 5 is removed and the body 2 is torn spirally in the direction opposite to the winding direction of the paperboard strip 9 to take out the specimen A.

Example 5 This example is shown in FIGS. 9 and 10, in which the mold of this invention is applied to a mold for forming a through hole in a concrete wall.

In FIG. 9, a mold 30 has a barrel end protection ring 3 similar to that in Example 1 above attached to one end of the barrel 2, and a metal barrel end protection ring 31 also attached to the other end. . Latter body end protection ring 3
1 includes a score line 1 for cutting the ring 31.
6, a score line 32 is formed to break a part of the trunk clamping part 14 and weaken the clamping force on the trunk 2. In addition, the outer wall 1 of the body clamping part 14
4a is not provided with an inward folded portion, but an inner folded portion is provided on the inner wall 14b. These points are the differences from the ring 3 of the first embodiment. The score line 32 is the inner wall 14b of the clamping part 14.
It extends outward in the length direction of the body 2 from the tip thereof, and extends in the circumferential direction to cover almost the entire circumference. A portion of the score line 32 extending outward in the longitudinal direction of the body 2 from the tip of the inner wall 14b of the clamping portion 14 is indicated by 32a, and a portion extending in the circumferential direction is indicated by 32b. Furthermore, a tab 33 is provided at a portion of the inner wall 14b of the clamping portion 14 that is sandwiched between both portions 32a, 32b of the score line 32 so as to protrude inward in the length direction of the body 2.

FIG. 10 shows the process of forming a through hole in a concrete wall using the mold 30.

To form a through hole, apply paraffin to the outer peripheral surface of the mold 30, place it horizontally in a concrete wall form (not shown), pour concrete into the concrete wall form, and then Let it harden naturally. Next, the tab 33 is pinched and pulled first in the radial direction and then in the circumferential direction to break the inner wall 14b of the clamping part 14 from the score line 32 (see FIG. 10a). Then, the clamping force of the clamping portion 14 on the body 2 becomes weaker, and when the tab 33 is further pulled outward in the longitudinal direction of the body 2, the ring 31 comes off from the body 2 (see FIG. 10b).

Thereafter, the mold 30 is removed by tearing the body 2 spirally in the winding direction of the paperboard strip 9. In this way, a through hole C is formed in the concrete wall B.

In this Example 5, any of the rings shown in Examples 2 to 4 may be used in place of the ring 3.

Effects of the invention According to the concrete mold of this invention, the strength is increased by the action of the body end protection ring, so deformation is prevented during pouring of concrete. Furthermore, due to the action of the cylinder end protection ring, water seeps into the paper that makes up the cylinder from the edge during concrete pouring, which further reduces the strength of the cylinder and prevents the cylinder from deforming or tearing. This will prevent you from doing so. Therefore, it is possible to manufacture concrete strength test specimens of desired dimensions, and it is also possible to form through holes, grooves, etc. of desired dimensions in concrete walls.

Also, after the concrete has hardened, the ring is cut along with the ring cutting score line when the shell is removed by breaking it. Alternatively, by breaking at least a part of the body clamping part of the ring to weaken the clamping force on the body, the body clamping part is broken from the score line, the ring is removed from the body, and then the body is broken. The body can be removed. Therefore, the removal work of the mold is also easy.

[Brief explanation of the drawing]

1 and 2 show Example 1 of this invention, FIG. 1 is a partially cutaway perspective view, and FIG. 2 is a process diagram showing the manufacturing process of a specimen for concrete strength testing. Figures 3 and 4 show Example 2 of this invention, Figure 3 is a partially cutaway perspective view with some parts omitted, and Figure 4 is a process showing the manufacturing process of a specimen for concrete strength testing. It is a diagram. Figures 5 and 6 show Example 3 of this invention, Figure 5 is a partially cutaway perspective view with some parts omitted, and Figure 6 is a process showing the manufacturing process of a specimen for concrete strength testing. It is a diagram. Figures 7 and 8 show Example 4 of this invention, Figure 7 is a partially cutaway perspective view with some parts omitted, and Figure 8 is a process showing the manufacturing process of a specimen for concrete strength testing. It is a diagram. Figures 9 and 10 show a fifth embodiment of this invention, with Figure 9 being a partially cutaway perspective view with the middle part omitted, and Figure 10 showing a rear mold with a through hole formed in a concrete wall. It is a figure which shows the method of removal. 1, 20, 25... Formwork for manufacturing concrete strength test specimen, 2... Body, 3, 21, 26,
31... Torso end protection ring, 14... Torso clamping part, 16, 22, 27, 32... Score line, 30
...A mold for forming through holes in concrete walls.

Claims (1)

[Scope of utility model registration request] It consists of a cylindrical body made of paper or a composite material mainly made of paper, and a body end protection ring attached to at least one of both ends of the body, and the body end protection ring has a U-shaped cross section. The end of the body is clamped by the body clamping part of the ring, and the body end protection ring has a score line for cutting the ring and at least a part of the body clamping part of the ring. A mold for concrete in which at least one of the score lines is formed to break the concrete and weaken the clamping force against the body.