CN2669133Y - Double cantilever concrete structure strain gauge - Google Patents

Abstract

A strain gauge with double cantilever concrete structure, the upper end of the casing is provided with an upper end cover, the lower end is provided with a lower end cover, a left spring piece and a right spring piece are arranged in the casing, and a spring is arranged between the left spring piece and the right spring piece The upper pad and the lower pad, the upper part of the left spring piece and the right spring piece are set in the fixed end clamp under the upper end cover, and the left spring piece and the right spring piece are provided with 2 to 16 pieces of strain relief connected to the output wires. One end of the dowel rod that is inserted into the housing and is covered with a limit ring is set on the left spring piece and the right spring piece, the other end is set on the right support, and the lower end cover is provided with a left support. It has the advantages of high sensitivity, easy calibration, small linear error, good long-term stability, adjustable gauge length, low production cost, wide application range, strong moisture resistance, stable output signal, and convenient use. After it is connected with the strain gauge , to detect the strain in concrete members.

Description

Double cantilever concrete structure strain gauge

technical field

The utility model belongs to the technical field of equipment for measuring relative displacement, and in particular relates to a double cantilever concrete structure strain gauge.

Background technique

Strain is usually one of the main physical quantities that need to be observed in engineering quality inspection, service life evaluation, disease cause analysis, and new structural type test research of bridges and various building structures. There are two main types of concrete strain gauges currently used to measure the strain of concrete buildings. One is the strain gauge, which is directly pasted on the detected part of the structure during use. Chip placement, wire bonding, and chip sealing are often carried out at a height of several meters or even tens of meters, which is relatively difficult, difficult to guarantee quality, and relatively low efficiency. Moreover, the measured value is greatly affected by the ambient temperature and humidity, and there are often some points. The measured value drifts a lot, and the reliability of the measured data is low. The other is the bow-shaped strain gauge. The main structure of the strain gauge is that a strain gauge is bonded to a relatively large and thick bow-shaped spring piece. The bow-shaped spring piece needs to be pressed by a special metal mold, and the processing is complicated and the production cost is high. , the steel of the bow-shaped spring piece is large, which affects the strain on the surface of the sensing member, the calibrated data is inaccurate, and the stability is poor. In particular, both ends of the strain gauge are pasted on the support, and it is impossible to remove both ends of the support at the same time during disassembly, resulting in a large force on the sensitive part of the strain gauge, and the strain gauge is easily damaged, resulting in a change in the correction coefficient, making the The measurement results have large errors.

Contents of the invention

The technical problem to be solved by the utility model is to overcome the shortcomings of the above-mentioned concrete strain gauge, and provide a kind of reasonable design, high sensitivity, easy calibration, small linear error, good long-term stability, adjustable gauge length, low production cost, A strain gauge for concrete structures with a wider application range.

The technical solution adopted to solve the above technical problems is: an upper end cover is provided at the upper end of the housing, a lower end cover is provided at the lower end, a left spring piece and a right spring piece are arranged in the housing, and a spring is arranged between the left spring piece and the right spring piece. There are upper spacer and lower spacer, the upper parts of the left spring piece and the right spring piece are set in the fixed end clamping block under the upper end cover, and the left spring piece and the right spring piece are provided with 2 to 16 pieces connected with the output wires Strain gauges, one end of the dowel rod inserted into the housing and the limit ring is set on the left spring piece and the right spring piece, the other end is set on the right support, and the left support is provided on the lower end cover.

The strain gage of the utility model has an even number of slices. The strain rod of the utility model includes an auxiliary connecting rod and a connecting rod, one end of the auxiliary connecting rod is connected with one end of the connecting rod, the other end of the auxiliary connecting rod is arranged on the left and right spring pieces, and the other end of the connecting rod is arranged on the right on the stand.

The thickness of the left spring piece and the right spring piece of the utility model is 0.2～1mm, the length of the left spring piece and the right spring piece is 15～100mm, and the distance between the left spring piece and the right spring piece is 0.5～10mm.

Compared with the existing concrete strain gauge, the utility model adopts two thinner spring pieces to sense the tension and compression deformation of the concrete member, and 2 to 16 strain gauges are arranged on the two thinner spring pieces. The sensitivity of the utility model is greatly improved, the temperature can be self-compensated, the sealing is convenient, the moisture resistance ability is greatly improved, and the output signal is stable. The shell is installed on the left support, and the dowel is connected by auxiliary connecting rod and connecting rod. It is convenient to install on site during use, and avoids damage to the sensing element due to knocking on the support during disassembly. It has the advantages of high sensitivity, easy calibration, small linear error, good long-term stability, adjustable gauge length, low production cost, wide application range, strong moisture resistance, stable output signal, and convenient use. It is connected with the strain gauge After that, the strain of the concrete member can be detected.

Description of drawings

Fig. 1 is a schematic structural view of an embodiment of the utility model.

Detailed ways

The utility model is described in further detail below in conjunction with accompanying drawing and embodiment, but the utility model is not limited to these embodiments.

Example 1

In Fig. 1, the double cantilever concrete structure strain gauge of this embodiment consists of a housing 1, an upper end cover 2, a left spring leaf 3, an output lead 4, an upper spacer 5, an upper strain gauge 6, a fixed end clamp 7, Right spring piece 8, lower strain gauge 9, auxiliary connecting rod 10, limit ring 11, right support 12, stop screw 13, connecting rod 14, lower spacer 15, lower end cover 16, left support 17, nut 18 Join composition.

An upper end cover 2 and a lower end cover 16 are installed on the upper end in the housing 1, and a left spring leaf 3 is installed on one side of the symmetrical center line in the housing 1, and a right spring leaf 8 is installed on the other side. Spring leaf 3 and right spring leaf 8 are used for feeling the relative displacement of concrete member, and produce deformation, between left spring leaf 3 and right spring leaf 8, upper spacer 5 is installed, lower spacer 15 is installed below, left spring The upper part of the piece 3 and the right spring piece 8 is inserted and fixed in the fixed end clamp block 7, and the fixed end clamp block 7 is installed on the lower part of the upper end cover 2, the thickness of the left spring piece 3 and the right spring piece 8 is 0.6mm, and the left spring piece 3 and the length of right spring leaf 8 are 60mm, and the distance between left spring leaf 3 and right spring leaf 8 is 5mm. By changing the thickness of the left spring 3 and the right spring 8 or the length of the left spring 3 and the right spring 8, it is easy to adjust the output sensitivity and strain measurement range of the utility model, and various resolutions can be manufactured. Concrete strain gauges. The upper strain gauge 6 is bonded on the outer surface of the left spring piece 3, the upper strain gauge 6 is bonded on the outer surface of the right spring piece 8, and the lower strain gauge 9 is bonded under the outer surface of the left spring piece 3 , the lower strain gauge 9 is bonded under the outer surface of the right spring piece 8, and the upper strain gauge 6 and the lower strain gauge 9 can also be bonded on the inner surface of the left spring piece 3 and the right spring piece 8, and the upper strain gauge 6 and the lower strain gauge 9 are connected to the output wire 4, and the upper strain gauge 6 and the lower strain gauge 9 output the deformation of the left spring piece 3 and the right spring piece 8 through the output wire 4. In the housing 1, the bottom of the left spring 3 and the right spring 8 is threadedly installed with an auxiliary connecting rod 10. The right end of the auxiliary connecting rod 10 is processed with an internal thread, and the left end is fixed on the left spring 3 and the right spring with a nut 18. The lower part of the sheet 8, the right end of the auxiliary connecting rod 10 protrudes from the right side of the housing 1, and a limit ring 11 is set inside the right side of the auxiliary connecting rod 10, and the limit ring 11 is used to limit the left spring leaf 3 and the right spring. Spring leaf 8 moves to the right within a certain range. The right end of the auxiliary connecting rod 10 is fixedly connected with a connecting rod 14 by thread, the right end of the connecting rod 14 is installed on the right support 12, and a stop screw 13 is installed on the right support 12, and the stop screw 13 is used for the stop connection. Relative movement of rod 14 and support 12 . On the outer end face of lower end cover 16, left support 17 is installed by screw connection, when left support 17 and right support 12 are used for measuring the strain of building component, left support 17 and right support 12 are glued Connected to the concrete member under test. When the surface of the concrete member is stretched or compressed, a relative displacement occurs between the left support 17 and the right support 12, and the left spring leaf 3 and the right spring leaf 8 are deformed through the connecting rod 14, and bonded to the left spring leaf 3 and the upper strain gauge 6 and the lower strain gauge 9 on the outside of the right spring piece 8 feel the deformation of the left spring piece 3 and the right spring piece 8, and output it to the strain gauge through the output wire 4. Through the calibration coefficient, the measured concrete member can be measured The strain value of the part.

Example 2

In this embodiment, an upper strain gauge 6 is bonded on the outer surface of the left spring piece 3, and one upper strain gauge 6 is bonded on the outer surface of the right spring piece 8, and the upper strain gauge 6 and the output lead 4 connected. The thickness of the left spring leaf 3 and the right spring leaf 8 is 0.2mm, the length of the left spring leaf 3 and the right spring leaf 8 is 15mm, and the distance between the left spring leaf 3 and the right spring leaf 8 is 0.5mm. Other components and the coupling relationship of the components are the same as in Embodiment 1.

Example 3

In this embodiment, four upper strain gauges 6 and four lower strain gauges 9 are bonded to the outer surface of the left spring piece 3, and four upper strain gauges 6 and 4 are bonded to the outer surface of the right spring piece 8. The lower strain gauge 9 , the upper strain gauge 6 and the lower strain gauge 9 are connected to the output wire 4 . The thickness of left spring leaf 3 and right spring leaf 8 is 1mm, and the length of left spring leaf 3 and right spring leaf 8 is 100mm, and the distance between left spring leaf 3 and right spring leaf 8 is 10mm. Other components and the coupling relationship of the components are the same as in Embodiment 1.

Claims (3)

1, a kind of pair of cantilever xoncrete structure strain measurement meter, it is characterized in that: the upper end in housing [1] is provided with upper end cover [2], the lower end is provided with bottom end cover [16], in housing [1], be provided with left spring sheet [3] and right spring leaf [8], be provided with cushion block [5] and lower cushion block [15] between left spring sheet [3] and the right spring leaf [8], the top of left spring sheet [3] and right spring leaf [8] is arranged in the stiff end fixture block [7] under the upper end cover [2], left spring sheet [3] is provided with 2～16 foil gauges that are connected with output lead [4] with right spring leaf [8], an end that interts in the housing [1] and be set with the transmission rod of spacing collar [11] outward is arranged on left spring sheet [3] and the right spring leaf [8], the other end is arranged on the right support abutment [12], and bottom end cover [16] is provided with left support abutment [17].

2, according to said pair of cantilever xoncrete structure of claim 1 strain measurement meter, it is characterized in that: said foil gauge has the even number sheet; Said strain bar comprises auxiliary connecting rod [10] and connecting rod [14], one end of auxiliary connecting rod [10] connects with an end of connecting rod [14], the other end of auxiliary connecting rod [10] is arranged on left spring sheet [3] and the right spring leaf [8], and the other end of connecting rod [14] is arranged on the right support abutment [12].

3, according to claim] [or 2 said pairs of cantilever xoncrete structure strain measurement meters, it is characterized in that: the thickness of said left spring sheet [3] and right spring leaf [8] is 0.2～1mm, the length of left spring sheet [3] and right spring leaf [8] is 15～100mm, and the distance between left spring sheet [3] and the right spring leaf [8] is 0.5～10mm.

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