JPH0760130B2 - Test method for spray-cured material - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for testing a hardening material such as mortar which is sprayed onto a mold made of wire mesh installed on a slope.

[0002]

2. Description of the Related Art A construction is employed in which a mold made of expanded metal or crimp wire mesh is installed on a slope or the like, and a hardening material such as mortar or concrete is sprayed onto the mold to construct a structure. In order to test the strength of such a spray-cured material, it is adopted to make a test piece from the hardened material and test the test piece. For this test piece, the curing material b was sprayed and cured in the cylindrical mold a shown in FIG.

[0003]

Conventionally, the test piece used for such a test uses a mold in which a steel plate or the like is made into a cylindrical shape as shown in FIG. If you use a mold that does not
It was a test piece that was very different from the hardened material sprayed on the formwork using wire mesh. That is, when the hardened material is sprayed with compressed air, when it is sprayed on the wire mesh, the air at the time of spraying escapes from the meshes of the wire, and the hardened material is in a dense state with no porous inside. It becomes a structure. However, when sprayed on a mold having no holes through which air escapes, the air remains in the curable material and becomes porous, or as shown in FIG. 5, the curable material jumps out of the mold a due to the spraying pressure. scoop b
The mold a was put again into the mold a. As a matter of course, the performance of the test piece produced by such a rehardened curing material was significantly different from that of the structure produced by the sprayed curing material, and an accurate performance test could not be performed.

In order to improve such a defect, a metal mold used in actual construction forms a cylindrical mold,
It is conceivable to spray a hardening material on this to form a cylindrical mold, and then spray the hardening material on this to make a test piece, but the hardening material enters the mesh and after the hardening material hardens,
It is impossible to remove the wire mesh. When the test is performed with the wire mesh integrated, the load applied to the test piece is borne by the surrounding wire mesh, so the numerical value of the experiment result is the value obtained by the strength of the hardened material and the binding force of the surrounding wire mesh. Is. Therefore, this cannot be used as the result of the strength test of only the cured material.

The present invention has been made to solve the above problems, and it is possible to test a spray-cured material in almost the same state as the spray-cured material in actual construction. It is intended to provide a test method for a hardened material.

[0006]

SUMMARY OF THE INVENTION A method for testing a spray-hardening material according to the present invention is to form a mold using a paper-made rectangular divisional body having a large number of holes.
A rectangular mold is formed by continuously arranging the sides of the rectangular divided bodies so as to abut each other. The mold is formed with slits between one side and the other side between the sides of each divided body,
The mold can be disassembled by this slit. By abutting the side edges of the divided bodies, a plurality of slits extending from one end to the other end are formed in the mold. The molds are integrated by connecting them with the adhesive tapes that straddle the sides of the left and right divided bodies that have abutted against each other.

A hardening material is sprayed into this mold. Since a large number of holes are formed on the surface of the mold, even if compressed air is blown into the mold by the pressure of the spray, the compressed material escapes from the holes, the curable material does not bounce, and no porosity occurs in the curable material. After the hardening material is hardened, the adhesive tape is peeled off.
As a result, each divided body becomes independent, and the test is performed in this state. The mold is divided from the slits into each divided body, and depending on the mold, the curing material is not constrained at all. In other words, it is possible to carry out a strength test only on the hardened material without any restraint force of the mold. In this state, the divided body is tested while being attached to the test piece. The divided body is paper, which is disposable and bends much more easily than wire mesh or steel plate, and therefore has no effect on the strength of the hardened material.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on an embodiment shown in the drawings. In FIGS. 1 and 2, reference numeral 1 denotes a mold, which is formed by a plurality of divided bodies 3 made of thick cardboard in which a large number of holes 2 are formed. That is, the sides of the divided body 3 are abutted against each other to form a tubular shape. As a result, a plurality of slits 5 that are continuous from one end to the other end of the cylindrical mold 1 are formed between the sides of each of the divided bodies 3, 3. An adhesive tape 4 is attached so as to straddle the slit 5, and the divided bodies 3 are connected and integrated. Adhesive tape 4
As the tape, various known tapes can be used.

Mortar, which is a hardening material 6, is sprayed into the mold 1 as described above under the same conditions as in actual construction. At this time, the air does not escape from the holes 2 of the mold 1 and remain in the hardening material 6. After the hardening material 6 hardens, it becomes the test piece 7, and the adhesive tape 4 is peeled off from the mold 1. As a result, the mold 1 can be disassembled with the slit as a boundary, as shown in FIGS. 3 and 4.

In this state, the test piece 7 is tested. Since the hardening material 6 enters the hole 2 of the mold 1 from the inside and is hardened, the hardening material 6 is caught in the hole 2 and it is difficult to peel the divided body 3 from the test piece 7. However, since the mold 1 is in a state that it can be disassembled from the slit 5, the force for restraining the test piece 7 by the mold 1 does not act. By performing the test in this state, the strength and the like of only the hardened material 6 can be tested.

[0011]

The present invention has the above-mentioned structure and can obtain the following effects. Since the test piece is formed by using the mold having a large number of holes, it is possible to test the hardened material under the same conditions as the actual construction without the air in the hardened material being released and not jumping out. The mold is integrated by the adhesive tape, and the restraining force of the mold does not act on the test piece by peeling the adhesive tape. Therefore, it becomes possible to test the strength and the like of only the hardened material. The mold can be dismantled simply by peeling off the adhesive tape, and the constraint of the mold can be released even if the curing material is caught in the hole and the divided body cannot be peeled off. Since the divided body is formed of paper, it is inexpensive even if it is disposable, and it bends more easily than wire mesh or steel plate, and does not affect the strength of the hardened material of the test piece at all.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of a mold for carrying out a test method according to the present invention.

FIG. 2 is a plan view showing a state where a curing material is sprayed on a mold.

FIG. 3 is a perspective view showing a state in which an adhesive tape is peeled off.

FIG. 4 is a plan view with an adhesive tape removed.

FIG. 5 is a perspective view of a conventional test piece in a prepared state.

[Explanation of symbols]

 1 Mold 2 Hole 3 Divided Body 4 Adhesive Tape 5 Slit 6 Curing Material 7 Test Piece

Claims (1)

[Claims] 1. A cylindrical mold is formed by arranging a plurality of paper-shaped rectangular divided bodies having a large number of holes so that their side edges abut against each other to form a cylindrical mold. Multiple slits formed from one end to the other that are continuous from one end to the other enable disassembly, and the mold is integrated by connecting with the adhesive tape that straddles the side of the left and right divided bodies A test method for a spray-hardened material, in which a hardened material is sprayed inside to cure, the adhesive tape is peeled off, and then the internal hardened material is tested with the divided body attached.