JP3388009B2 - Insulation container used for strength control of concrete structure and method for strength control of concrete structure - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for estimating and managing the strength of a concrete structure by estimating the strength of a specimen formed of concrete having the same composition as the structure.

[0002]

2. Description of the Related Art In order to track the strength of a concrete structure in a traceable manner, a large number of specimens are prepared using concrete having the same composition as the structure at the same time as the concrete is poured into the concrete structure. Then, the strength test of the concrete structure shall be estimated and controlled from this data by subjecting the test piece to a strength test sequentially for each fixed curing period such as 1 week, 4 weeks, 8 weeks and 13 weeks. I have to.

Regarding this strength management method, the difference in temperature history between the specimen and the actual concrete structure poses a problem. That is, in the case of a concrete structure having a large volume, the inside becomes a high temperature state of about 60 to 70 ° C. due to the heat generated by the hardening of the concrete (the highest temperature state usually occurs 20 to 30 hours after casting, After more than a week, the internal temperature rise state disappears.) However, since the volume of the specimen is small, the internal temperature rise state is very different from the actual concrete structure, and there is a large difference in the temperature history between the two. This lowers the correspondence between the strength of the specimen and the strength of the actual concrete structure, which in turn leads to lower management accuracy.

To reduce the difference in temperature history between the specimen and the actual concrete structure, for example, Japanese Patent Laid-Open Nos. 2-300646 and 5-87716.
Several technologies are already known as publications.

The technique disclosed in Japanese Patent Laid-Open No. 2-360046 is
The difference between the temperature histories is to be reduced by curing the test piece adiabatically, and therefore the test piece is housed in a container made of foamed resin having a high heat insulating property. More specifically, a block made of foamed resin or the like having a high heat insulating property is used as a container, and the specimen is embedded in a plurality of accommodation holes provided in a fixed array in this block for a certain period of time (usually I try to keep it).

On the other hand, the technique disclosed in Japanese Unexamined Patent Publication No. 5-87716 has a drawback in the technique disclosed in Japanese Unexamined Patent Publication No. 2-300646, that is, since a plurality of receiving holes are provided in one block, heat insulation performance around each receiving hole is improved. It was proposed as an improvement of the drawback that it causes non-uniformity, which causes a difference in the temperature history between the specimen and the actual concrete structure, and uniformly insulates the periphery of the specimen. It is designed so that it can be done. Specifically, each of the test pieces is covered with a container formed of foamed resin or the like so as to have an outer surface shape similar to the outer surface shape of the test piece.

According to the technique disclosed in Japanese Unexamined Patent Publication No. 5-87716, it is possible to surely improve the approximation of the temperature history, but there is still a big problem in advancing the actual strength management work. That is, dozens of specimens are used for one time of concrete pouring, but it is impractical and impractical to cover each such a large number of specimens with a container individually. There is also a problem that the manufacturing cost is increased because the shape of the container is complicated.

For this reason, Japanese Unexamined Patent Publication No. 2-30064.
It can be said that it is better to use a method of collecting a certain number of pieces in a single container as in the technique of Japanese Patent No. However, it is a fact that this method still has the problem of nonuniform heat insulation performance as described above, and improvement in this point is desired. In addition, this method has a problem in workability when the sample is stored in the accommodation hole of the container. First of all, the specimens, especially the specimens of the young children just created, need careful handling so as not to give vibrations, etc. If you put hundreds of them in the storage hole, the handling may be violent. In addition, the fact that there is no grip and that it is heavy greatly affects the efficiency of the work of putting the sample in and out of the container. Furthermore, this method also has a problem in durability of the container because the storage hole is easily damaged when the sample is taken in and out when the container is repeatedly used.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and in a system in which a plurality of specimens are accommodated in a single container, the heat insulation of the specimens is uniform. It is intended to further improve the durability of the container, to improve the durability of the container, and to allow the sample to be taken in and out of the container smoothly.

[0010]

To achieve the above object, the present invention comprises a container body having a plurality of housing holes in a highly heat insulating block and a lid for covering the container body.
The temperature history of the concrete to be controlled by accommodating a plurality of columnar specimens made of concrete with the same composition as that of the concrete structure to be managed in the container body's housing hole to protect it insulatively Regarding a heat insulating container used for strength control of a concrete structure that is made to be close to the structure, an auxiliary hole having the same direction as the accommodation hole is provided around each accommodation hole.

By surrounding the perimeter with the auxiliary holes in this way, the width of the thermal insulation zone around the accommodation holes can be made isotropic, and the directional non-uniformity of the thermal insulation of each accommodation hole can be reduced.

Further, in the present invention, by making the respective accommodation holes of such a heat insulating container communicate with each other through the communication holes, it is possible to make the temperature history uniform among the respective specimens. That is, the accommodation holes are semi-independent and semi-integral by communicating with each other through the communication holes of appropriate size. In other words, regarding the influence of outside air when the lid of the heat insulating container is opened, each accommodation hole is sufficiently independent, and heat exchange between each specimen through the communication hole that occurs throughout the curing period of the specimen is pointed out. In this case, the respective accommodation holes are integrated, and as a result, it is possible to further enhance the homogenization of the temperature history between the respective specimens.

Further, according to the present invention, a plurality of columnar specimens are made of concrete having the same composition as the concrete used for the concrete structure to be managed, and a strength test is performed on each of the specimens to obtain the concrete to be managed. Regarding the strength management of the structure, regarding the strength management method of the concrete structure in which the heat insulating container of the present invention adiabatically protects the sample to make its temperature history close to that of the concrete structure to be managed, The sample is wrapped in a film-like wrapping material and stored in a storage hole of the container.

As described above, since the specimen is wrapped in the wrapping material and handled, the specimen can be smoothly put in and taken out of the container, and must be avoided in the specimen of a young age. It is possible to effectively reduce unwanted vibrations. In particular, if a bag made of a slippery material such as cellophane paper is used as the wrapping material, it is easy to wrap, and the slipping on the wall surface of the receiving hole is improved, which makes it easier to take in and out. Moreover, the rate of damaging the receiving hole is reduced, and the durability of the container can be improved.

[0015]

EXAMPLES Examples of the present invention will be described below. First, the heat insulating container used in this embodiment will be described. Heat insulation container 1
As shown in FIGS. 1 and 2, the container body 2 and the lid 3 are made of a styrofoam rectangular parallelepiped block, and the container body 2 has a plurality of, 12 in this example, accommodating holes 4, 4. , ... are formed in four rows of three, and the structure is such that the specimen S shown in FIG. 3 is accommodated in each of the accommodation holes in a state as shown in FIG. 4 described later. The reason why three pieces are arranged in a row is that the strength test of the specimens is performed in a set of three pieces.

Each accommodation hole 4 has a diameter of 5 from the diameter of the sample S shown in FIG.
It is formed in a cylindrical shape having a diameter of about mm and a depth slightly deeper than the height of the sample S, and a predetermined gap is formed above the sample S in a housed state. A chamfered portion 4c that widens upward is formed at the upper end portion. The chamfered portion 4c is for preventing the sample S from being caught around the upper end portion of the accommodation hole 4 and damaging the accommodation hole 4 when the sample S is accommodated in the accommodation hole 4, and the chamfered portion 4c is provided. Contribute to improvement.

Further, a plurality of auxiliary holes 5, 5, ...
Are formed in the same vertical direction as the respective accommodation holes 4 and penetrate vertically. As a result, each accommodation hole 4 is surrounded by auxiliary holes 5, 5, ... Which are, so to speak, “moats”, and a high degree of uniformity is given to the heat insulation zone around the auxiliary holes 5, 5 ,.

On the other hand, the lid 3 is formed with a convex portion 3r for engagement at a position corresponding to the accommodation hole 4, and the convex portion 3r is shallowly fitted to the upper end portion of the accommodation hole 4 to form the container body 2. Is settled down. The degree of protrusion of the convex portion 3r is made lower than the above-mentioned gap so that a space R for accommodating a residual portion 6a of the packaging material 6 described later can be provided between the convex portion 3r and the sample S. . Further, the lid 3 is provided with auxiliary holes 5p penetrating up and down so as to be integrated with the auxiliary holes 5 of the container body 2 in the vertical direction.
The auxiliary holes 5 penetrate the entire heat insulating container 1 in the vertical direction. The lid 3 is fixed to the container body 2 by attaching a tape T around the joint between the lid 3 and the container body 2 in order to obtain a sufficient sealed state with respect to the accommodation hole 4.

Next, the preparation and handling of the specimen S will be described. The specimen S shown in FIG. 3 is formed by placing concrete of the same composition as the concrete structure to be managed on a metal frame F formed with a thickness that does not substantially affect the strength test. As shown in FIG. 4, the heat-insulating container 1 is put into and taken out of the heat-insulating container 1 and conveyed to the tester by wrapping it in a bag-shaped wrapping material 6 made of cellophane paper. Specifically, the size of the wrapping material 6 is set to be sufficiently longer than the height of the test piece S so that the surplus portion 6a of the upper part of the wrapping material 6 in the state where the test piece S is wrapped can be grasped and handled by hand. There is.

FIG. 5 and FIG. 6 show a heat insulating container 11 according to another example. This heat insulating container 11 is basically the same as the heat insulating container 1 and auxiliary holes 5, 5, ... …
Container body 12 having accommodating holes 4, 4, ...
And a lid 3 for covering the same, which is different in that the accommodation holes 4 are communicated with each other by lateral communication holes 14.

FIG. 7 shows an example in which the auxiliary holes 5, 5, ... In the heat insulating container 1 are modified. Specifically, in the heat insulating container 20, the auxiliary hole 2 formed by giving the container body 21 an arcuate cross-sectional shape along the outer periphery of the accommodation hole 4
Similarly, four 2 are vertically penetrated, and an auxiliary hole 22p corresponding to the auxiliary hole 22 is also vertically provided in the lid 23 of the lid 23 so as to be closer to the "moat" surrounding the accommodation hole 4 described above. ing.

[0022]

As described above, according to the present invention, the temperature history of the specimen is controlled by using the heat insulating container capable of containing a plurality of specimens. Since the auxiliary holes of the same direction are provided to make the width of the heat insulation zone around each accommodation hole isotropic, the uniformity of heat insulation of each accommodation hole is improved and the temperature history of each specimen is improved. Can be made more uniform. Further, in the present invention, since the accommodation holes of the heat insulating container are made to communicate with each other by the communication holes, it is possible to further enhance the uniformity of the temperature history in each sample. Furthermore, in the present invention, since the specimen is wrapped in the wrapping material and handled, it becomes easy to carefully handle the specimen when putting it in and out of the heat-insulating container, thereby further improving the test accuracy. It is also possible to improve the durability of the heat insulating container.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a heat insulating container according to an embodiment of the present invention.

FIG. 2 is a plan view seen from an arrow A ₂ direction in FIG.

FIG. 3 is a sectional view of the specimen.

FIG. 4 is a perspective view showing a state in which a sample is wrapped with a wrapping material.

FIG. 5 is a sectional view of a heat insulating container according to another embodiment of the present invention.

FIG. 6 is a plan view seen from the direction of the arrow A _{6 in} FIG.

FIG. 7 is a partial plan view of a heat insulating container according to still another embodiment of the present invention, which corresponds to FIG.

[Explanation of symbols]

1, 11, 20 insulated containers 2, 12 container body 3, 13 lid 4, 21 accommodation hole 4c Chamfer 5 auxiliary holes 6 wrapping materials 14 communication holes S specimen

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-2-300646 (JP, A) JP-A-5-302873 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) G01N 1/28 G01N 3/08

Claims (3)

(57) [Claims] 1. A highly heat insulating block comprising a container body having a plurality of accommodation holes and a lid covering the container body, and made of concrete having the same composition as the concrete used for the concrete structure to be managed. A heat-insulating container used for strength management of a concrete structure in which a plurality of columnar specimens are housed in the housing holes of the container body to be protected adiabatically so that the temperature history is close to that of the concrete structure to be managed. A heat-insulating container, characterized in that an auxiliary hole having the same direction as the accommodation hole is provided around each accommodation hole. 2. The heat insulating container according to claim 1, wherein the accommodation holes are communicated with each other through a communication hole. 3. A plurality of columnar specimens are made of concrete having the same composition as the concrete used for the concrete structure to be managed, and a strength test is performed on each of the specimens to obtain a concrete structure of the concrete structure to be managed. Regarding the strength management, in the strength management method of a concrete structure, the test case is adiabatically protected by the heat insulation container according to claim 1 or 2, and the temperature history of the test piece is made close to that of the concrete structure to be managed. A method for controlling the strength of a concrete structure, characterized in that the specimen is wrapped in a film-like wrapping material and stored in a storage hole of a container.