CN211740464U - A clip-type steel bar meter that does not need to cut off the steel bar under test - Google Patents

Abstract

A clip-type steel bar meter that does not need to cut off the steel bar to be tested includes a metal elastic body upper clip and a metal elastic lower clip, and the two sides of the metal elastic upper clip and the metal elastic lower clip are respectively provided with connecting parts The upper clip of the metal elastic body and the lower clip of the metal elastic body are connected by the connecting part, and the upper clip of the metal elastic body and the lower clip of the metal elastic body are respectively provided with stress detection elements. The steel bar meter of the utility model does not need to cut off the steel bar to be tested, but only needs to fasten two pieces of metal elastomer clips on the periphery of the steel bar to be tested. When the internal structure of the steel bar to be tested changes in stress, the stress detection element synchronously senses the change of stress. Therefore, the stress of the measured steel bar can be obtained, which meets the requirements that welding and cutting of steel bars are not allowed in special projects. The structure is simple and the operation is convenient.

Description

A clip-type steel bar meter that does not need to cut off the steel bar under test

technical field

The utility model belongs to the technical field of in-situ testing of reinforced concrete structures, in particular to a clip-type steel bar meter which avoids cutting off the steel bar to be tested.

Background technique

At present, the stress test of steel bars in reinforced concrete structures is monitored by a steel bar gauge, which connects the steel bar gauge and the steel bar under test as a whole. Stretch together, and the axial stress of the measured steel bar can be obtained through the internal structure of the steel bar gauge.

The installation method is: Weld the steel bars at both ends of the steel bar meter 8 and the steel bar under test 1 for construction, as shown in Figures 5 and 6, or connect the steel bars at both ends of the steel bar meter 8 with the steel bar under test 1 for construction. As shown in Figures 7 and 8, whether it is welding or sleeve threaded connection, the steel bar to be measured is cut off and then connected to the steel bar gauge, that is to say, the steel bar gauge assumes the role of the cut off part of the steel bar and can transmit force.

These installation methods are widely used, but this installation method cannot be implemented for engineering projects that must not be broken or damaged. Refined design, extremely poor operability.

Utility model content

Aiming at the problems existing in the prior art, the utility model provides a clip-type steel bar meter that does not need to cut off the steel bars to be tested, does not need to cut off the steel bars to be tested, can meet the special requirements in special projects, has a simple structure and is easy to install.

In order to achieve the above purpose, the technical scheme adopted by the present utility model is to provide a clip-type steel bar meter that does not cut off the steel bar to be tested, including an upper clip of a metal elastic body and a lower clip of the metal elastic body, and an upper clip of the metal elastic body. The two sides of the metal elastomer lower clip are respectively provided with connecting parts. There are stress detection elements.

Further, as described above, a clip-type steel bar meter that avoids cutting off the steel bar under test, the internal structure shape formed after the upper clip of the metal elastic body and the lower clip of the metal elastic body are connected and the external structure of the steel bar to be tested. shape to fit.

Further, as described above, a clip-type steel bar meter that avoids cutting off the steel bar to be tested, the upper clip of the metal elastic body and the lower clip of the metal elastic body are respectively provided with grooves, and the stress detection element is fixed in the in the groove.

Further, according to the above-mentioned clip-type rebar gauge that does not cut off the rebar to be tested, the inner surfaces of the upper clip of the metal elastic body and the lower clip of the metal elastic body are provided with threads to prevent sliding.

Further, according to the above-mentioned clip-type equivalent steel bar gauge that does not need to cut off the steel bar under test, the stress detection element is a resistance strain gauge or a vibrating wire strain gauge.

Further, according to the above-mentioned clip-type steel bar meter that does not cut off the steel bar to be tested, the lengths of the upper clip of the metal elastic body and the lower clip of the metal elastic body are not more than 50 mm.

The beneficial technical effects of the present utility model are:

The steel bar meter provided by the utility model is provided with two metal elastic body clips, and a stress detection element is placed in the two metal elastic body clips. On the periphery, when the stress change occurs inside the steel bar under test, the stress detection element simultaneously senses the stress change, so as to obtain the stress of the steel bar under test, without cutting the steel bar under test. Simple structure and convenient installation.

Description of drawings

Fig. 1 is the cross-sectional view of the steel bar meter of the present utility model;

Fig. 2 is the installation drawing of the steel bar meter of the present utility model;

Fig. 3 is the layout diagram of the steel bar gauge resistance strain gauge of the present utility model;

Fig. 4 is the layout diagram of the vibrating wire strain gauge of the steel bar gauge of the present invention;

Figures 5 and 6 are schematic structural diagrams of a connection method of a steel bar gauge in the prior art;

Figures 7 and 8 are schematic structural diagrams of another connection method of the steel bar gauge in the prior art.

In the picture:

1-Rebar under test 2-Metal elastomer upper clip 3-Metal elastomer lower clip 4-Connector 5-Groove 6-Connecting part 7-Installation hole 8-Rebar gauge

Detailed ways

The specific embodiments of the present utility model will be described in further detail below with reference to the accompanying drawings.

As shown in Figure 1, it is a clip-type steel bar meter that does not need to cut off the steel bar to be measured provided by the present utility model. It is used to test the stress of steel bars in a reinforced concrete structure, and it includes a metal elastomer upper clip 2 and a metal elastomer lower clip 3. The upper clip 2 of the metal elastic body and the lower clip 3 of the metal elastic body are respectively provided with connecting parts 6 (the number and position of the connecting parts are determined according to actual needs), and the upper clip 2 of the metal elastic body and the metal elastic body are respectively provided on both sides. The connecting parts 6 on both sides of the lower body clip 3 are connected by connecting pieces 4 (eg, bolts), and stress detection elements are provided in both the upper metal elastic body clip 2 and the lower metal elastic body clip 3 .

Wherein, the length a of the upper metal elastic body clip 2 and the lower metal elastic body clip 3 is not greater than 50 mm, and the thickness is 3 mm or a suitable thickness, as shown in FIG. 2 . The structure and shape of the upper metal elastic body clip 2 and the lower metal elastic body clip 3 are not limited, as long as the internal structural shape formed after connection is compatible with the external structural shape of the steel bar 1 to be tested. For example, if the cross section of the steel bar 1 to be tested is a circular or square structure, the internal shape of the metal elastomer upper clip 2 and the metal elastomer lower clip 3 after connecting is a circular or square structure. The upper clip 2 of the metal elastomer and the lower clip 3 of the metal elastomer are made of materials with the same mechanical properties as the steel bar 1 to be tested, so as to ensure the accurate determination of the detection data.

The metal elastomer upper clip 2 and the metal elastomer lower clip 3 are respectively provided with grooves 5, and the stress detection element is fixed in the groove 5. In order to avoid damage to the stress detection element during the installation process and the concrete construction process, The groove 5 is encapsulated, as shown in FIG. 3 .

The stress detection element is a resistance strain gauge, a vibrating wire strain gauge or a microelectronic sensor, etc. No matter which stress detection element is used, a rebar gauge with this structure can be used.

In addition, the vibrating wire strain gauge can be installed in a variety of ways, not only in the groove, but also in the installation hole 7, that is, the upper clip 2 of the metal elastic body and the lower clip 3 of the metal elastic body are appropriately enlarged. A plurality of mounting holes are arranged axially along the metal elastomer upper clip 2 and the metal elastomer lower clip 3, and the vibrating wire strain gauge is placed in the mounting holes and packaged, as shown in Figure 4.

It should be noted that the above-mentioned rebar gauges with different stress detection elements are based on the good mechanical properties of elastic materials and the existing temperature compensation technology. When designing the resistance strain gauge rebar gauge, the Wheatstone bridge is considered, and the equal-arm bridge is adopted. , the upper and lower clips of the metal elastomer work together with the steel bar to be tested, and the test data has a linear relationship with the axial stress. When calculating the axial force of the steel bar under test, the reinforcing effect of the upper clip of the metal elastic body and the lower clip of the metal elastic body on the steel bar to be measured shall be fully considered, and the effective area of the upper clip of the metal elastic body and the lower clip of the metal elastic body shall be calculated. S1 plus the cross-sectional area of the steel bar under test S0 is the overall effective cross-section. When the steel with the same mechanical properties as the steel under test is used for the upper clip of the metal elastic body and the lower clip of the metal elastic body, the elastic modulus E is the same, and the calculation is not calculated by the steel bar. The actual measured steel axial force reinforced by the elastic upper clip and the metal elastic lower clip should be FN=Eε(S1+S0), and ε is the strain.

In addition, in order to prevent the upper clip 2 of the metal elastic body and the lower clip 3 of the metal elastic body from sliding on the steel bar 1 to be tested, the upper clip 2 of the metal elastic body and the lower clip 3 of the metal elastic body are placed on the inner surfaces of the Set the thread.

When using, first design the internal structure of the upper clip of metal elastomer and the lower clip of metal elastomer according to the external structure of the steel bar to be tested, and then fix the stress detection element in the upper clip of metal elastomer and the lower clip of metal elastomer respectively. , and finally fasten the upper clip of the metal elastomer and the lower clip of the metal elastomer to the outside of the steel bar under test.

The steel bar meter of the present invention is not limited to the above-mentioned specific embodiments, and those skilled in the art can obtain other embodiments according to the technical solutions of the present invention, which also belong to the technical innovation scope of the present invention.

Claims (6)

1. a clip-type steel bar meter that avoids cutting off the steel bar to be tested, it is characterized in that: comprise metal elastic body upper clip (2) and metal elastic body lower clip (3), metal elastic upper clip (2) And the two sides of the lower metal elastic body clip (3) are respectively provided with connecting parts (6), the upper metal elastic body clip (2) and the lower metal elastic body clip (3) are connected by the connecting part (6), the metal elastic body The upper elastic body clip (2) and the metal elastic body lower clip (3) are respectively provided with stress detection elements. 2. The clip-type rebar gauge of claim 1, characterized in that: after the upper clip (2) of the metal elastic body and the lower clip (3) of the metal elastic body are connected The formed internal structural shape is adapted to the external structural shape of the steel bar (1) to be tested. 3. A clip-type steel bar meter for avoiding cutting off the steel bar to be tested as claimed in claim 2, characterized in that: the upper clip (2) of the metal elastic body and the lower clip (3) of the metal elastic body are respectively A groove is provided, and the stress detection element is fixed in the groove. 4. The clip-type steel bar meter for avoiding cutting off the steel bar to be measured as claimed in claim 3, characterized in that: the inner surface of the upper clip (2) of the metal elastic body and the lower clip (3) of the metal elastic body There are threads to prevent slippage. 5 . The clip-type rebar gauge as claimed in claim 4 , wherein the stress detection element is a resistance strain gauge or a vibrating wire strain gauge. 6 . 6. The clip-type steel bar meter for avoiding cutting off the steel bar to be measured according to any one of claims 1-5, is characterized in that: the upper clip (2) of the metal elastic body and the lower clip of the metal elastic body (3) The length is not more than 50mm.

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