CN2938027Y - Measuring device for change of pipe joint field angle and component curvature - Google Patents

Abstract

The utility model discloses a measuring device for measuring the field angle of a segment joint in a high temperature (a normal temperature) experiment and the variation of component curvature, comprising two measuring rods and two displacement gauges. The lower end of the measuring rod is provided with a fixed end. The two displacement gauges are parallel arranged between the two measuring rods; and the two ends of the displacement gauges are respectively connected with the two measuring rods. When using the utility model, the user will firstly fix the fixed end at the lower end of the measuring rod on the surface of a segment or a component that are to be measured, since the two displacement gauges are arranged between the two measuring rods, and then the user can calculate the filed angle of the segment joint or the variation of the component curvature according to the displacement variation of the two displacement gauges. As the device is only needed to be arranged on the surface of a single side of the component to be measured, the installation is convenient. When used for the experiment in a high temperature, the measuring device can be arranged at the lower temperature side of the component to be measured. Even if in this situation, the measuring device can still work normally. With high precision, the measuring range of the utility model can be adjusted.

Description

Duct piece connector subtended angle and member curved transition measurement mechanism

Technical field

The utility model relates to the measurement mechanism in a kind of structural mechanics field, specifically, relates to a kind of measurement mechanism that is used for measuring tube strip terminal subtended angle and member curved transition.

Background technology

Joint subtended angle (amount of opening) and member curvature are two important parameters that the reaction structure mechanical property changes.Under normal temperature condition, usually pass through to measure the variation of distance between two gauge lengths of tested member surfaces externally and internally, so the curvature of the subtended angle of reckoning joint and member (Wang Zhe, Li Jingshuan. subway section of jurisdiction girth joint bending stiffness experimental study [J]. industrial building, 2005,1 (35): 86-88; Yao Zhengang, Liu Zuhua writes. Architectural Structure Experimentation. and Shanghai: publishing house of Tongji University, 1996).But this when carrying out normal temperature the method for joint subtended angle and the test of member curvature have several aspects shortcoming: (1) installation workload is big, needs four points to be fixed on the tested member.Simultaneously, the space of tested member surfaces externally and internally need be taken, the layout of other testing elements can be had influence on; (2) measurement of joint subtended angle and member curvature in the time of can not being used for hot test; (3) when actual joint subtended angle or member curved transition value were very little, if do not use high-precision displacement meter, then measuring result error was bigger; (4) when actual joint subtended angle or member curved transition are big, need the displacement meter of wide range to realize, increased difficulty of test and experimentation cost.Particularly under hot conditions, still there are not efficient apparatus and the method for measuring joint subtended angle and member curved transition at present.

The utility model content

The technical problems to be solved in the utility model provides a kind of high temperature (and normal temperature) that can be used for and tests and duct piece connector subtended angle and member curved transition measurement mechanism easy for installation.

In order to solve the problems of the technologies described above, the utility model adopts following technical scheme: a kind of duct piece connector subtended angle and member curved transition measurement mechanism, comprise two measuring staffs and two displacement meters, the lower end of described measuring staff is provided with fixing feet, two displacement meters are installed between two measuring staffs abreast, and the two ends of displacement meter are connected with two measuring staffs respectively.

Measurement mechanism of the present utility model can utilize the fixing feet of measuring staff lower end to be fixed on the surface of section of jurisdiction to be measured or member, owing to be provided with two displacement meters between two measuring staffs, utilize the change in displacement of two displacement meters, can calculate the subtended angle or the member curved transition of duct piece connector.Because this device only need be installed in the single side surface of member to be measured, therefore install more convenient; When being used for hot test, measurement mechanism of the present utility model can be installed in the low temperature side of member to be measured, in this case, measurement mechanism also can operate as normal.

As a kind of improvement of technique scheme, be provided with scale on the described measuring staff along its length.Utilize scale on the measuring staff can indicate the link position of displacement meter and measuring staff.

As a kind of preferred version of technique scheme, respectively be provided with two slip rings on two measuring staffs, and be provided with and can make slip ring be fixed on locking device on the measuring staff, the two ends of described displacement meter are connected with slip ring respectively.Regulate two positions of displacement meter on measuring staff by slip ring, the range of displacement meter and the curved transition scope of duct piece connector subtended angle or member are adapted, also promptly under the condition that does not change the displacement meter range, can satisfy the duct piece connector subtended angle of different values and the measurement of member curved transition.

As improvement to above-mentioned preferred version, also comprise two adjustable expansion links, a wherein end of described two displacement meters is connected with slip ring by an adjustable expansion link.Regulate the length of two adjustable expansion links, can set two initial values that displacement meter is suitable.

Description of drawings

Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.

Fig. 1 is the structural representation of measurement mechanism of the present utility model.

Fig. 2 be utilize measurement mechanism measuring tube strip terminal subtended angle of the present utility model schematic diagram.

Fig. 3 utilizes measurement mechanism of the present utility model to measure the schematic diagram of member curved transition.

Embodiment

As shown in Figure 1, the lower end of two measuring staffs 1 is provided with fixing feet 6, fixing feet 6 can be fixed on the surface of member to be measured with the mode of expansion bolt or welding, be provided with scale on the measuring staff 1 along its length, respectively be provided with two slip rings 2 on two measuring staffs 1, slip ring 2 can be locked on the measuring staff 1 by holding screw, two displacement meters 3,4 are installed between two measuring staffs 1 abreast, displacement meter 3, an end of 4 is connected with two slip rings 2 on the measuring staff 1 respectively, displacement meter 3,4 the other end is connected with two adjustable expansion links 5 respectively, and the other end of adjustable expansion link 5 then is connected with two slip rings 2 on another root measuring staff respectively.The length of adjustable expansion link 5 can telescopic adjustment also can be fixed, and when measuring, the length of adjustable expansion link 5 is changeless.

Measuring principle and using method to measurement mechanism measuring tube strip terminal subtended angle of the present utility model and member curved transition further specifies below.

In order narrating conveniently, to set two displacement meters 3,4 and be respectively P1, P2.

1) measuring principle of joint subtended angle

For connector test, because the influence of high temperature, the measurement of subtended angle can only be carried out at the section of jurisdiction extrados.Based on plane cross-section assumption, joint subtended angle θ and the amount of opening Δ can obtain as follows.

As shown in Figure 2, establish joint subtended angle θ and open for just with the inboard, then:

ΔL ₁＝L ₁-L ₁’ (1)

ΔL ₂＝L ₂-L ₂’ (2)

$\mathrm{\θ}=2\arctan \frac{{\mathrm{\ΔL}}_1-{\mathrm{\ΔL}}_2}{{2D}_1}---\left(3\right)$

$\mathrm{\Δ}=\mathrm{\θ}\·h=2h\·\arctan \frac{{\mathrm{\ΔL}}_1-{\mathrm{\ΔL}}_2}{{2D}_1}---\left(4\right)$

In the formula, θ-joint subtended angle (radian); Δ-seam amount of opening; H-member thickness; L ₁Displacement meter P1 place two measuring staff spacings before the-distortion; L ₁Displacement meter P1 place, '-distortion back two measuring staff spacings; L ₂Displacement meter P2 place two measuring staff spacings before the-distortion; L ₂Displacement meter P2 place, '-distortion back two measuring staff spacings; D ₁The distance of-displacement meter P1 and P2; D ₂The distance of-displacement meter P2 and component surface to be measured; Δ L ₁The change in displacement of-displacement meter P1 actual measurement; Δ L ₂The change in displacement of-displacement meter P2 actual measurement.

Like this, the change in displacement Δ L that surveys according to displacement meter P1, P2 ₁, Δ L ₂Substitution formula (3), (4) can obtain the joint subtended angle and the amount of opening.In actual the use, displacement measurement, subtended angle all with the direction among Fig. 2 for just; When actual displacement is opposite with direction among Fig. 2, then with the negative substitution.In like manner, when result of calculation when negative, the expression joint opens among direction and Fig. 2 opposite.

2) measuring method of member curved transition

When utilizing this measurement device member curved transition, as shown in Figure 3, establish curvature direction shown in Figure 3 for just, then:

ΔL ₁＝L ₁-L ₁’ (5)

ΔL ₂＝L ₂-L ₂’ (6)

$\mathrm{\θ}=2\arctan \frac{{\mathrm{\ΔL}}_1-{\mathrm{\ΔL}}_2}{{2D}_1}---\left(7\right)$

In the formula, the angle between θ-distortion back member two test sections; The mean curvature of member changes between -two test section; H-member thickness; L ₀Distance between the preceding two test sections of-distortion; L ₁Displacement meter P1 place two measuring staff spacings before the-distortion; L ₁Displacement meter P1 place, '-distortion back two measuring staff spacings; L ₂Displacement meter P2 place two measuring staff spacings before the-distortion; L ₂Displacement meter P2 place, '-distortion back two measuring staff spacings; D ₁The distance of-displacement meter P1 and P2; D ₂The distance of-displacement meter P2 and component surface to be measured; Δ L ₁The change in displacement of-displacement meter P1 actual measurement; Δ L ₂The change in displacement of-displacement meter P2 actual measurement.

Like this, the change in displacement Δ L that surveys according to displacement meter P1, P2 ₁, Δ L ₂Substitution formula (8) can obtain the mean curvature of member at the test position place and change.In actual the use, displacement measurement all with the direction among Fig. 3 for just; When actual displacement is opposite with direction among Fig. 3, then with the negative substitution.In like manner, when result of calculation when negative, opposite among expression member bending direction and Fig. 3.

3) using method

Use this device to carry out joint subtended angle under high temperature or the normal temperature or member curved transition when measuring, using method is:

1) by expansion bolt (tested member is a concrete material) or welding (tested member is steel) reference test bar 1 is fixed on the tested member;

2) according to joint amount of opening and the curved transition scope estimated, select suitable D ₁, D ₂(two measuring staffs are identical), and slip ring 2 is fixed on the measuring staff 1;

3) adjust the initial value that expansion link 5 is set suitable displacement meter 3,4;

When 4) testing, constantly write down the reading Δ L of displacement meter 3,4 ₁, Δ L ₂

5) with the Δ L that records ₁, Δ L ₂Substitution formula (3), (4) can obtain the joint subtended angle and the amount of opening.In like manner, with the Δ L that records ₁, Δ L ₂The mean curvature that substitution formula (8) can obtain member changes.

The advantage applies of this device exists:

(1) measurement of joint subtended angle and member curved transition in the time of can being used for high temperature and normal temperature easily; Particularly during high temperature measurement,, avoided high temperature, guaranteed the accuracy of measurement result to the damage of displacement meter with to the influence of measuring accuracy because displacement meter is in the normal temperature district away from the tested member of high temperature.

(2) easy for installation, only need on tested member, to fix at 2 and get final product.Simultaneously, need not to take the inside surface space of tested member, also can avoid influence near other testing elements external surface of structural member.

(3) need not to change displacement meter P1, the range of P2, by adjusting D1 (distance of displacement meter P1 and P2), numerical value and the adjustable expansion link of D2 (distance of displacement meter P2 and component surface to be measured) can satisfy the joint subtended angle (amount of opening) of different values and the measurement of member curved transition.

(4) when joint subtended angle to be measured or member curved transition hour, can adjust D1 (distance of displacement meter P1 and P2), D2 (distance of displacement meter P2 and component surface to be measured) makes D1, the D2 thickness greater than tested member, be equivalent to amplify the reading of displacement meter P1, P2 like this, can have improved measuring accuracy;

(5) when joint subtended angle to be measured or member curved transition are big, can adjust D1 (distance of displacement meter P1 and P2), D2 (distance of displacement meter P2 and component surface to be measured) makes D1, D2 less than member thickness, be equivalent to dwindle the reading of displacement meter P1, P2 like this, make and use the displacement meter of little range also can measure big joint subtended angle and member curved transition, enlarged the measurement range of this device.

Claims (4)

1. duct piece connector subtended angle and member curved transition measurement mechanism, it is characterized in that: comprise two measuring staffs (1) and two displacement meters (3,4), the lower end of described measuring staff (1) is provided with fixing feet (6), two displacement meters (3,4) be installed in abreast between two measuring staffs (1), the two ends of displacement meter (3,4) are connected with two measuring staffs (1) respectively.

2. duct piece connector subtended angle according to claim 1 and member curved transition measurement mechanism is characterized in that: described measuring staff is provided with scale on (1) along its length.

3. duct piece connector subtended angle according to claim 1 and 2 and member curved transition measurement mechanism, it is characterized in that: respectively be provided with two slip rings (2) on described two measuring staffs (1), and be provided with and make slip ring (2) be fixed on locking device on the measuring staff (1), the two ends of described displacement meter (3,4) are connected with slip ring (2) respectively.

4. duct piece connector subtended angle according to claim 3 and member curved transition measurement mechanism, it is characterized in that: also comprise two adjustable expansion links (5), a wherein end of described two displacement meters (3,4) is connected with slip ring (2) by an adjustable expansion link (5).

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