Concrete quick-freezing method freezing-thawing test sensor pre-embedding device

Abstract

The utility model discloses a sensor pre-embedding device for a concrete quick-freezing-method freezing-thawing test. The device comprises a cuboid-shaped test mold, the upper portion of the test mold is open, a vertically-arranged clamping piece is arranged in the test mold and divides the inner space of the test mold into a first space matched with a concrete test piece and a second space capable of containing a sensor, and the two inner side walls of the test mold are each provided with a groove penetrating through the height direction of the test mold; the two ends of the clamping piece are in sliding fit with the grooves in the two inner side walls of the test mold respectively, a sensor insertion hole is formed in the middle of the clamping piece, a pull ring is fixedly arranged at the top of the clamping piece, and a through hole is formed in the test mold bottom plate in the first space; and the test mold and the card are made of plastic materials. The device is simple in structure, the temperature sensor and the concrete test piece can be integrally formed at a time, later treatment is not needed, the concrete test piece is easy to prepare and operate, demolding is convenient, the detection efficiency can be greatly improved, the test mold cannot be damaged in the test piece preparation process, and the test mold can be recycled.

Description

Technical Field

[0001] The utility model relates to a sensor pre-embedded device for a freeze-thaw test of a concrete quick-freezing method, which is an auxiliary device for the freeze-thaw test of the concrete quick-freezing method. Background Art

[0002] The rapid freezing method is one of the main methods for testing the frost resistance of concrete. The rapid freezing method is a method of measuring the frost resistance of concrete by measuring the number of rapid freeze-thaw cycles that a concrete specimen undergoes under freezing and thawing conditions.

[0003] Before conducting a quick freezing test on concrete, a temperature test specimen with a temperature sensor embedded in its center needs to be made. The temperature sensor should be embedded in the center of the specimen, and the temperature sensor should not be embedded by drilling and then inserting it. The temperature sensor is generally embedded by fixing a clean rubber rod with a diameter slightly larger than the probe at the position of the pre-embedded probe. Before the initial setting or when the concrete is slightly solidified, the rubber rod is pulled out, the probe is inserted, and then the mortar or cement paste with the same mortar as the original concrete is poured. This method is inconvenient to operate and the process is complicated. Alternatively, a section of the test mold can be cut off and the temperature sensor can be directly inserted into the poured concrete. This method is inconvenient to operate and causes damage to the test mold, resulting in waste of the test mold. Utility Model Content

[0004] In view of the above-mentioned defects in the prior art, the utility model provides a pre-embedded device for a concrete quick freezing method freeze-thaw test sensor which has a simple structure, does not cause damage to the test mold, and is flexible and convenient to use.

[0005] The utility model is realized through the following technical scheme: a sensor pre-embedded device for freeze-thaw test of concrete quick freezing method, characterized in that: it includes a rectangular test mold, the upper part of the test mold is open, and a vertically arranged card is provided inside the test mold, the card divides the internal space of the test mold into a first space that conforms to the concrete specimen and a second space that can accommodate the sensor, the two inner side walls of the test mold are respectively provided with grooves running through the height direction thereof, the two ends of the card are respectively slidably matched with the grooves on the two inner side walls of the test mold, the middle part of the card is provided with a sensor jack, the top of the card is fixedly provided with a pull ring, and a through hole is provided on the bottom plate of the test mold in the first space; the test mold and the card are both made of plastic.

[0006] When the present invention is used, the temperature sensor is fixed to the card through the sensor socket on the card, the temperature measuring part of the temperature sensor is located in the first space, and the rear end of the temperature sensor is located in the second space. The first space is used to pour concrete to make concrete specimens. When pouring concrete in the first space, the temperature measuring part of the temperature sensor is directly formed into one piece with the concrete at one time, without the need for subsequent processing. The rear end of the temperature sensor is located in the second space, and the sensor can be protected during the specimen production process. The through hole on the bottom plate of the test mold in the first space is used for demolding by an air pump. The pull ring on the top of the card is used to assist in demolding when the specimen is removed after hardening. When demolding the specimen after hardening, an air pump is used to demold it through the through hole on the bottom plate of the test mold in the first space. During demolding, the specimen and the card are removed from the test mold together, and then the card and the temperature sensor can be separated. The test mold can be recycled.

[0007] Furthermore, in order to facilitate demoulding by an air pump, the diameter of the through hole is 5 mm.

[0008] Furthermore, to prevent leakage during concrete pouring, the bottom plate of the test mold is also provided with a groove that fits with the bottom of the card. Both sides and the bottom of the card fit with the test mold through the groove, which can effectively prevent leakage during the preparation of concrete specimens.

[0009] Furthermore, the thickness of the card is 5 mm.

[0010] The beneficial effects of the present invention are as follows: the present invention has a simple structure, the temperature sensor and the concrete specimen can be molded into one piece at one time, a detachable sliding connection is adopted between the card and the test mold, when the concrete specimen is demolded, the card and the temperature sensor and the concrete specimen are ejected from the test mold together, the concrete specimen is easy to demold, the temperature sensor is reliably buried, and no subsequent processing is required, the specimen is simple and convenient to make, the detection efficiency can be improved, and the test mold will not be damaged during the making of the specimen, which can reduce waste; the card and the test mold in the present invention are both made of plastic material, which is easy to demold, and the material has the advantages of high strength, strong durability, good corrosion resistance, and easy processing, and the production cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural diagram of the utility model;

[0012] In the figure, 1, test mold, 1.1, first space, 1.2, second space, 1.3, groove; 2, card, 3, pull ring, 4, sensor jack, 5, through hole. DETAILED DESCRIPTION

[0013] The present invention will be further described below by way of non-limiting embodiments and in conjunction with the accompanying drawings:

[0014] As shown in the accompanying drawings, a sensor pre-embedded device for freeze-thaw testing of concrete using the rapid freezing method comprises a rectangular test mold 1, the upper portion of which is open. A vertically arranged card 2 is positioned within the mold 1. The card 2 divides the interior of the mold 1 into a first space 1.1 and a second space 1.2. The first space 1.1 is used to form a concrete specimen, and its internal dimensions match those of the concrete specimen. The second space 1.2 is used to accommodate a temperature sensor, and its internal dimensions should be sufficient to accommodate the temperature sensor. The inner sidewalls of the mold 1 are each provided with a groove 1.3 extending through the height of the mold. The ends of the card 2 slide into the grooves 1.3 on the inner sidewalls of the mold 1, allowing the card 2 to be withdrawn upward from the mold along the grooves. The height of the card 2 is the same as that of the mold 1. A sensor jack 4 is positioned in the middle of the card 2 for mounting a temperature sensor, and its dimensions match those of the temperature sensor. To facilitate demolding, a pull ring 3, which can be made of stainless steel, is fixed to the top of the card 2. The bottom plate of the test mold within the first space 1.1 is provided with a through hole 5, preferably 5 mm in diameter, to facilitate demolding via an air pump. Both the test mold 1 and the card 2 in this utility model are made of plastic, a material characterized by high strength, durability, corrosion resistance, ease of processing, and ease of demolding. The thickness of both the test mold 1 and the card 2 should meet structural strength requirements, with the card 2 preferably being 5 mm thick.

[0015] In order to prevent leakage during the preparation of concrete specimens, it is preferred that the bottom plate of the test mold 1 is also provided with a groove that cooperates with the bottom of the card 2. Both sides and the bottom of the card 2 cooperate with the test mold through the grooves, which can effectively prevent leakage during the preparation of concrete specimens.

[0016] When using the present invention, the temperature sensor is first inserted into the sensor jack 4 on the card 2, and the length of the portion of the temperature sensor to be embedded is adjusted. The card 2 with the temperature sensor fixed is then inserted into the groove 1.3 on the test mold 1. The temperature measuring portion of the temperature sensor to be embedded is located within the first space 1.1 of the test mold 1, and the exposed end of the temperature sensor is located within the second space 1.2 of the test mold 1. Concrete can then be poured into the first space 1.1 of the test mold 1. After the test piece has hardened, it can be demolded. During demolding, an air pump can be used to demold the test piece through the through hole 5 on the bottom plate of the test mold 1. The pull ring 3 on the card 2 can also be used to assist in demolding. During demolding, the concrete test piece, card 2, and temperature sensor are simultaneously removed, and the card 2 can then be separated from the concrete test piece.

[0017] The utility model has a simple structure, and the temperature sensor and the concrete test piece are formed into one piece at one time, and no subsequent processing is required. The concrete test piece preparation operation is simple and demoulding is convenient, which can greatly improve the detection efficiency. In addition, the test mold 1 will not be damaged during the preparation of the test piece, and the test mold can be recycled.

[0018] The other parts of this embodiment are all existing technologies and will not be described in detail here.

Claims

1. A sensor embedded device for concrete rapid freezing and thawing test, characterized by: The invention comprises a rectangular parallelepiped test mold (1), the upper part of the test mold (1) is open, a vertically arranged card (2) is provided inside the test mold (1), the card (2) divides the internal space of the test mold (1) into a first space (1.1) corresponding to the concrete specimen and a second space (1.2) capable of accommodating a sensor, the two inner side walls of the test mold (1) are respectively provided with grooves running through the height direction thereof, the two ends of the card (2) are respectively slidably matched with the grooves on the two inner side walls of the test mold (1), a sensor jack (4) is provided in the middle of the card (2), a pull ring (3) is fixedly provided on the top of the card (2), and a through hole (5) is provided on the bottom plate of the test mold in the first space (1.1); the test mold (1) and the card (2) are both made of plastic.

2. The sensor embedded device for concrete rapid freezing and thawing test according to claim 1 is characterized in that: The diameter of the through hole (5) is 5 mm.

3. The sensor embedded device for concrete rapid freezing and thawing test according to claim 1 is characterized in that: The bottom plate of the test mold (1) is also provided with a groove that matches the bottom of the card (2).

4. The sensor embedded device for concrete rapid freezing and thawing test according to claim 1, 2 or 3, characterized in that: The thickness of the card (2) is 5 mm.

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