JPS63137804A - Mold-release method of concrete specimen - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Object of the Invention] The present invention relates to the production of specimens for concrete strength tests, which are easy to handle, durable, and easy to use. This invention relates to a method for demolding a concrete specimen that greatly increases the dimensional accuracy of the specimen.

Traditionally, as a method for producing specimens for such concrete strength tests, a demolding device consisting of a cylindrical frame and a bottom plate made of a moldable material was used, as shown in Japanese Patent Publication No. 2680/1980. It is known that strength tests are carried out by molding and removing it from concrete specimens, but the effect of the paulownia frame during the strength test makes it impossible to perform accurate tests, and it is also possible to mold Forming using materials has the disadvantage that the dimensional accuracy of concrete specimens is not accurate, and as shown in Figure 1 of the above-mentioned publication, molding is difficult because the metal formwork is divided into left, right, and bottom parts. There is also a method in which a mold release agent such as mineral oil is applied to the mold device, concrete is injected into the mold removal device, and then the mold removal device is separated to take out the concrete specimen.
After taking out the concrete specimen, it takes time to disassemble and clean the demolding device, and the method of storage after that causes rust, which reduces the precision of the formwork.

In addition, as shown in Japanese Patent Publication No. 56-30811 G, a cylindrical specimen collector is inserted into the concrete, the concrete around the specimen collector is destroyed, and the specimen collector is removed. It is known that the concrete specimen inside the container is taken out and pushed out with a presser, but this requires a rock drill to break the concrete around the specimen collector, and Since there is only a mold release agent such as mineral oil between the concrete specimen and the concrete specimen, a large amount of force is required to release the concrete specimen, resulting in a large pressing machine, which has the disadvantage of increasing costs. had.

The present invention solves the above-mentioned drawbacks by using a simple method for demolding concrete specimens.
It is an object of the present invention to provide a method for demolding a concrete specimen that simplifies cleaning, storage, etc. operations.

[Structure of the invention]

In view of this point, the present invention provides a demolding device for concrete specimens, in which the demolding device main body is formed of a cylindrical body, a cylindrical fixing ring, and a bottom plate. A polyester film formed into a plate shape is fitted and fixed inside, and concrete is poured into the demolding equipment body, and then low water pressure is injected into the demolding equipment body to demold the concrete specimen. The purpose of the present invention is to provide a method for demolding concrete specimens that have been prepared in a manner that overcomes the above-mentioned drawbacks.

1-Contrary to the present invention, concrete is poured into the demolding device body into which a polyester film is fitted and fixed, and then low water pressure is injected into the demolding device body, thereby extremely weakening the concrete demolding force. Therefore, it is possible to sufficiently demold the mold even at low water pressure such as drinking water pressure, and the finishing accuracy of the concrete specimen surface can be greatly improved. One embodiment will be described based on the drawings. 1 is a demolding device main body made of an appropriate material such as metal;
The demolding device main body 1 includes a cylindrical body 5, a cylindrical quantity determining link 6, and a bottom plate 9 (a trowel).

At the top of the cylindrical body 5, there is a fixing ring 4 with a protrusion 3 projecting diagonally inward for fixing the polyester film 2.
The cylindrical fixing ring 6 has a protrusion 7 protruding inward from the bottom, and C: the bottom plate 9 is placed in a cylindrical shape so that the upper surface 8 of the protrusion 7 and the lower surface 11 of the protrusion 10 of the bottom plate 9 are brought into surface contact. It is placed on a fixing ring 6.

The inner diameter of the cylindrical fixing ring 6 is suitably smaller than the outer diameter of the cylindrical body 5, and the cylindrical body 5 is inserted into the cylindrical fixing ring 6, so that the lower end surface 12 of the cylindrical body 5 is connected to the protrusion 1 of the bottom plate 9.
It is inserted to a position where it makes surface contact with the upper surface 13, and at this position, O-ring grooves 4.15 for sealing leakage of concrete Z are provided at appropriate lower and upper positions of the cylindrical fixing ring 6. 0 rings 16 and 17 are inserted.

At the corresponding positions of the cylindrical fixing ring 6 and the cylindrical body 5,
Groove 19.1 for inserting lock spring 18
Carve 9a, and the 0 ring! Between 14 and 15, a hole 20 for pressurizing from the outside is opened, and a hose fitting 21 is screwed into the hole 20.

Further, 22 is a notch provided in the cylindrical fixing ring 6 in order to insert the lock spring 18.Next, the method for demolding the concrete specimen W according to the present invention will be explained. At the same time, the polyester film 2 formed in
8 is inserted through the notch 22 to fix the cylindrical body 5, and a fixing ring 4 for fixing the polyester film 2 is placed on the upper part of the cylindrical body 5.

Then, after filling with concrete Z and curing for a certain period of time, a water hose is connected to the hose fitting 21,
By pulling out approximately half of the lock spring, the lock is loosened, and when water pressure is applied, the cylindrical body 5
As a result, pressure is applied to the bottom surface of the concrete specimen W, causing the concrete specimen W to be demolded from the cylindrical body 5, and the polyester film 2 and the polyester film circle 10 attached to the concrete specimen W to be removed from the cylindrical body 5. The concrete specimen W can be easily manufactured by attaching and detaching the strip 23.

〔Effect of the invention〕

In short, the present invention provides a demolding device for concrete specimens, in which the demolding device main body 1 is formed of a cylindrical body 5, a cylindrical fixing ring 6, and a bottom plate 9, and the demolding device body 1 is formed into a plate shape inside the demolding device main body 1. The concrete specimen is demolded by fitting and fixing the polyester film and pouring concrete into the demolding device main body 1, and then injecting low water pressure into the demolding device main body 1. The demolding device main body 1 has a simple structure and is compact, so it is easy to carry, which greatly reduces the labor involved in disassembling, cleaning, and storing the demolding device main body 10. By using 23 for demolding, the force during demolding is significantly reduced, so even when using water pressure and pneumatic pressure for demolding, it is possible to easily demold with a pressure of approximately 1 kg / cnl. The finishing accuracy of the surface of concrete specimens can be significantly improved, and polyester film 2
By using a plurality of polyester films 2, the demolding force can be significantly reduced compared to when only one polyester film 2 is used, and the practical effects thereof are enormous.

[Brief explanation of the drawing]

Figure 1 is a partially cutaway front view of the demolding device main body according to the present invention, Figure 2 is a sectional view taken along line A-A of the same, and Figure 3 is a polyester film. 4 is a perspective view of the demolding device main body, and FIG. 5 is an enlarged view of the main parts. 1. Demolding device body 2. Polyester film 25. Cylindrical body 6. Cylindrical fixing ring 9. Bottom plate 23. Polyester film disc and above Applicant: Keio Kume Figure 1 Figure 2 ・ Figure 4 Figure 5 Procedure amendments Written by Akira Kuroda, Commissioner of the Patent Office, December 3, 1986! i Tono 2, Name of the invention: Method for demolding concrete specimens 3, Relationship with the person making the amendment Applicant address Name: Hiroo Kume 4, Agent address: 1-23-6 Haruoka, Chikusa-ku, Nagoya Procedural amendment 1986 Patent Party 1. Regarding the above application filed on November 29, 2015, "2. Scope of Claims" in the specification is amended as follows. (4) 4433;'0') r plate 2. The fact that the film is inserted into the tongue of the device body is considered to be t-koma.
In the specification, lines 6 on page 4 to line 11 on page 4 are amended as follows. ``In order to demold the concrete specimen, a film is fitted and fixed inside the demolding equipment body, concrete is poured into the demolding equipment body, and then low pressure is sucked into the demolding equipment body to demold the concrete specimen. The film is made of synthetic resin, the film is made of metal, the film is fitted to the inner peripheral wall of the demolding device, and the film is inserted into the interior of the demolding device. 3. In the specification, from page 4, line 16 to line 17 of the same page, ``low water pressure is injected.'' Correct the statement to "inhale and inject low pressure." 4. In the specification, page 4, line 19 is amended as follows. "To be able to sufficiently demold even under low water pressure and low air pressure" 5. In the specification, the word "made of metal" on page 5, line 6,
Correct it to "made of metal or synthetic resin." 6. In the specification, page 6, line 12 to page 6, line 14 are amended as follows. "In addition, when the mounting bracket 21 is shown in the illustration, it is simply the hole 20.
Although a type of screwing type is shown, a ball made of metal or synthetic resin and a spring are interposed in the hollow portion at the tip of the mounting bracket 21, and the spring is attached so that the mounting bracket 21 has the effect of functioning as a so-called check valve. The ball may be closed in the hole by tension. Furthermore, in the case of the notch 22 shown in the figure, the upper part of the cylindrical fixing ring 6 is simply cut out in a fan shape, but it may be cut out diagonally or the notch 22 simply allows the lock spring 18 to be inserted. It may also be a cavity for. 7. In Specification 1, page 6, line 18 to line 20 of the same page are amended as follows. [Fitting and fixing the ester film 2, and inserting the lock spring 18 from the notch 22] 8. In the specification, the phrase "water hose" is written on page 7, line 5 to line 6 of the same page, Correct to "hose". 9゜ In MeihA, on page 7, line 8, the phrase "water pressure" is amended to read "water pressure or pneumatic pressure." In the IO0 specification, page 7, line 15 is amended as follows. "The polyester film disc 23 is not necessarily required." 11. In the specification, page 7, line 17 to page 8, line 19 are corrected as follows. ``In short, the present invention provides a demolding device for concrete specimens, in which the demolding device main body 1 is formed of a cylindrical body 5, a cylindrical fixing ring 6, and a bottom ! The film is fitted and fixed, concrete is poured into the demolding device main body, and then concrete is poured into the demolding device main body 1.
The device is designed to demold concrete specimens by injecting low pressure into the device, the film is made of synthetic resin, the film is made of metal, and the film demolding device itself. and the film were mounted on the inner peripheral wall and bottom wall of the demolding device main body 1, so that the mold removal device main body 1
Since it has a simple structure and is compact, it is easy to carry, and the labor involved in disassembling, cleaning, and storing the demolding device body 1 can be greatly reduced, and a film or a film disk can be used for demolding. As a result, the force during demolding is significantly reduced, so even when using water pressure and pneumatic pressure during demolding, demolding can be easily performed with a pressure of approximately 1 kg/cnl, and the surface finish of the concrete specimen can be improved. Accuracy can be significantly improved. Therefore, compared to the so-called three-split type demolding device which is made of castings and has a pair of left and right bodies and a bottom plate, it is possible to
The disadvantage of the conventional method is that the molds (formwork) are processed at the same time and can only be assembled together, and there are many pairs of left and right fuselages (formwork).
This completely eliminates the disadvantages of the conventional type, such as the need for management space when owning a , and the disadvantages of the conventional type in which the degree of accumulation of the circle diameter differs each time it is assembled due to the tightening of assembly bolts and nuts. Furthermore, by using a plurality of films, it is possible to improve the demolding force. In the present invention, the film is made of a synthetic resin such as a polyester film, or a metal, so it has great versatility and has great practical effects. 12. In the drawings, Figure 1 has been corrected as shown in the attached sheet. Applicant Kei Kume, Figure 1

Claims (1)

[Claims] In a demolding device for concrete specimens, the demolding device body is formed of a cylindrical body, a cylindrical fixing ring, and a bottom plate, and a polyester film formed into a plate shape is fitted and fixed inside the demolding device body. A method for demolding a concrete specimen, characterized in that the concrete specimen is demolded by pouring concrete into a molding device body and then injecting low water pressure into the demolding device body.