CN105067660A - Method for testing axial linear expansion coefficient of bamboo composite pressure tube - Google Patents
Method for testing axial linear expansion coefficient of bamboo composite pressure tube Download PDFInfo
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- CN105067660A CN105067660A CN201510518891.4A CN201510518891A CN105067660A CN 105067660 A CN105067660 A CN 105067660A CN 201510518891 A CN201510518891 A CN 201510518891A CN 105067660 A CN105067660 A CN 105067660A
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Abstract
The invention discloses a method for testing the axial linear expansion coefficient of a bamboo composite pressure tube. The method includes the following steps that, a plurality of samples with the same axial length are cut out from the bamboo composite pressure tube to be tested in the radial direction; the outer surfaces of the multiple samples are scribed and marked; mounting holes are drilled in the marked samples; a flexible displacement meter is pulled to a certain length in advance and then arranged on the outer surface of the corresponding sample; the samples are placed in a low-temperature permafrost environment, the room temperature is adjusted to be zero DEG C, and the displacement different value readings of the flexible displacement meter are adjusted to be zero till the readings of the flexible displacement meters are stable; the environmental temperature is controlled according to the test requirement, and the displacement value of each test temperature is recorded; the linear expansion coefficient alpha of each sample is calculated, and the arithmetic mean value of the linear expansion coefficients of multiple samples serves as the test result, so that the test on the linear expansion coefficient of the bamboo composite pressure tube is completed. By means of the method, the linear expansion coefficient of the bamboo composite pressure tube can be measured fast, the measuring result is accurate and reliable, and measuring efficiency is high.
Description
Technical field
The invention belongs to pipeline axial linear expansion coefficient field of measuring technique, more specifically, relating to a kind of method for testing bamboo composite pressure pipe axial line expansion coefficient.
Background technology
Bamboo composite pressure pipe is a kind of novel pressure pipeline, and it is followed successively by inner liner, enhancement layer and external protection coating from inside to outside along caliber direction, and wherein, inner liner is the nonwoven fabrics and the grid cloth that are soaked with resin; Enhancement layer is that bamboo chip is wrapped in the bamboo chip layer that inner liner is formed, and adopts cementing agent to bond between bamboo chip; External protection coating is the bamboo compound nonwoven cloth or the cotton grid cloth that are soaked with resin, the characteristics such as this novel pressure pipeline has that compressive resistance is high, good rigidity, insulation, corrosion resistant, current excellent performance, lightweight, easy for installation, with low cost, long service life, can be widely used in the fields such as urban water supply and sewerage, water conservancy, field irrigation, petroleum waste water process, industrial circulating water.
Linear expansion coefficient, sometimes also linear elasticity coefficient is claimed, refer to that temperature often changes the percent of 1 DEG C of duct length change, it is one of important indicator for the thermal stability quality weighing pipeline, average coefficient of linear expansion, refer between temperature t1 and t2, the mean value that the specimen length corresponding to temperature variation 1 DEG C changes relatively.In bamboo composite pressure pipe actual installation work progress, the linear expansion coefficient of its reality need be known, take corresponding indemnifying measure further according to linear expansion coefficient, under being especially applied in non-normal temperature environment, even more important to the determination of its linear expansion coefficient.And due to the material composition of bamboo composite pressure pipe different from other kind pipelines, not a kind of method of testing bamboo composite pressure pipe linear expansion coefficient that is applicable in prior art, therefore, cannot construct for the actual installation of bamboo composite pressure pipe and provide data supporting.
Summary of the invention
For above defect or the Improvement requirement of prior art, the invention provides a kind of method for testing bamboo composite pressure pipe axial line expansion coefficient, wherein in conjunction with the feature of bamboo composite pressure pipe self, devise the method being applicable to measure its linear expansion coefficient accordingly, and according to the structure of bamboo composite pressure pipe and component feature, the concrete test mode of its sampling mode and linear expansion coefficient is studied and designed, effectively can realize the Quick Measurement of bamboo composite pressure pipe linear expansion coefficient at low ambient temperatures accordingly, simultaneously also for the applied environment of bamboo composite pressure pipe, devise the test environment conformed to its applied environment, thus obtain the linear expansion coefficient of the bamboo composite pressure pipe under realistic environmental baseline, there is measurement result accurate, measure efficiency advantages of higher, for bamboo composite pressure pipe provides reference in the application of low temperature environment and the installation of practical demonstration engineering.
For achieving the above object, the present invention proposes a kind of method for testing bamboo composite pressure pipe axial line expansion coefficient, it is characterized in that, comprise the steps:
(1) prepare before test: bamboo composite pressure pipe to be tested is radially cut out the identical sample of multiple axial length; Rule and on above-mentioned each bar line, mark two for installing the position of mounting hole of flexible displacement meter every 180 ° along tubing is axial at the outside surface of described multiple sample respectively; Gauge length between described position of mounting hole is greater than the gauge length of described flexible displacement meter, and is less than the maximum range of described flexible displacement meter; Be set up in described mounting hole site and drill through mounting hole, be arranged on the outside surface of described sample by described mounting hole after described flexible displacement meter being pulled in advance the gauge length between described position of mounting hole;
(2) zeroing process: the sample being provided with flexible displacement meter is placed in low temperature frozen soil environment, adjustment room temperature be 0 DEG C until described flexible displacement meter stable reading after, the shift differences reading of described flexible displacement meter is adjusted to zero;
(3) linear expansion coefficient test: to control environment temperature according to test request, often controls a temperature, constant temperature a period of time until after described flexible displacement meter stable reading, record and the shift value preserved corresponding to each test; Calculate and obtain described each sample linear expansion coefficient α separately, and the arithmetic mean getting the linear expansion coefficient of multiple sample is as test result, in this way, completes the quick test of bamboo composite pressure pipe linear expansion coefficient.
As preferred further, described linear expansion coefficient α is determined by formula (1):
In formula: l
tfor the length of pipeline during t DEG C, unit is mm;
L
0for the length of pipeline during initial testing temperature, unit is mm;
Δ t is temperature variation, and unit is DEG C.
As preferred further, when described flexible displacement meter is installed, need ensure that this flexible displacement meter can measure the distortion of its stretching or compression direction.
As preferred further, described environment temperature is-20 DEG C ~ 70 DEG C.
As preferred further, described flexible displacement meter adopts trip bolt to fix.
As preferred further, described sample is preferably three.
In general, the above technical scheme conceived by the present invention compared with prior art, mainly possesses following technological merit:
1. the present invention be matrix material in conjunction with bamboo composite pressure pipe with bamboo wood, take thermoset resin as adhesive, the feature that adopts winding process to make, devise the linear expansion coefficient being applicable to measure the bamboo composite pressure pipe with said structure accordingly, especially linear expansion coefficient at low ambient temperatures, the step of test it and test mode are studied, for the application at low ambient temperatures of bamboo composite pressure pipe provides data supporting, there is measurement effect good, measure accurately, efficiency advantages of higher.
2. the present invention also takes into account the selection of meter installation site to the critical process in test as measured, fully in conjunction with the design feature of bamboo composite pressure pipe, design meets the test mode of its structural requirement, to realize the Quick Measurement of bamboo composite pressure pipe linear expansion coefficient at low ambient temperatures, flexible displacement meter is adopted to measure, also ensure simple to operation while guarantee data accuracy, in addition, the present invention is also for the applied environment (as deep seasonal frozen ground) of bamboo composite pressure pipe, devise the test environment conformed to its applied environment, make the actual application environment of test environment and bamboo composite pressure pipe close, thus obtain the linear expansion coefficient of the bamboo composite pressure pipe under realistic environmental baseline, measurement result accurately and reliably, for the application at low ambient temperatures of bamboo composite pressure pipe provides reference.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with embodiment, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.In addition, if below in described each embodiment of the present invention involved technical characteristic do not form conflict each other and just can mutually combine.
Test philosophy of the present invention is that the linear deformation of bamboo composite pressure pipe is mainly manifested in the bending of expansion prolongation on pipeline axial direction and horizontal direction, its swell increment and temperature proportional relation, the present invention's reconnaissance on the bamboo composite pressure pipe of certain length, boring, digital for JMDL-24XX Series Intelligent flexible displacement meter is arranged on bamboo composite pressure pipe, then bamboo composite pressure pipe is placed in constant temperature enclosure constant temperature certain hour, after measuring the flexible displacement meter stable reading of intelligent digital of length variations, record reading, by swell value and the shrinkage value of sample, calculate the average coefficient of linear expansion of sample, this test is carried out at controlled low temperature chamber and YH841-special type far infrared air-blowing drying box.
Testing tool of the present invention mainly comprises JMZX-300X comprehensive tester, JMDL-24XX Series Intelligent digital flexible displacement meter, PT100 temperature sensor, portable logging and YH841-special type far infrared air-blowing drying box.
Table 1JMZX-300X comprehensive tester performance index parameter
JMZX-300X comprehensive tester is a kind of portable, multi-functional, intelligent reading instrument, this instrument can be measured firm chord sensor, inductance fm class sensor, have the features such as detection speed is fast, precision is high, easy to use, its main performance index is in table 1.
The digital flexible displacement meter of JMDL-24XX Series Intelligent is inductance fm class sensor, has following characteristics: adopt inductor frequency modulation principle design feature, have high sensitivity, the advantages such as the impact of high precision, high stability, temperature is little, are applicable to long-term observation; The built-in storaging chip of flexible sensor for measuring bit shift, has intelligent memory functional, and can preserve measurement result needed for 600 times (as Measuring Time, measuring point temperature, absolute displacement, relative displacement, zero point value etc.); Adopt all-digital detection, signal long-distance transmission is undistorted, and antijamming capability is strong; Insulativity is good, waterproof durable; Be equipped with JMZX-300X integrated test system and can realize unattended duty measurement and remote monitoring.
PT100 temperature sensor is placed in bamboo composite pressure pipe outer wall and inwall, for measuring environment temperature actual inside and outside bamboo composite pressure pipe and and the temperature comparisons of the digital flexible displacement meter display of JMDL-24XX Series Intelligent.Portable logging is used for measuring the temperature of PT100 temperature sensor inside and outside bamboo composite pressure pipe.YH841-special type far infrared air-blowing drying box, heating power 18KW, operating room is of a size of 125X240X10cm, and temperature range is room temperature ~ 300 DEG C, temperature control precision ± 5 DEG C.
A kind of method for testing bamboo composite pressure pipe axial line expansion coefficient of the present invention, it mainly comprises the steps: to test front preparation, zeroing process and linear expansion coefficient test.
(1) prepare before test
(1.1) sample preparation reconnaissance
The present embodiment take nominal diameter as the bamboo composite pressure pipe of 300mm is example, and bamboo composite pressure pipe to be tested is radially cut out the identical sample of multiple axial length; According to the outside surface of test request at the bamboo composite pressure pipe of nominal diameter 300mm, every 180 ° along tubing axially line, and mark two on each line for installing the position of mounting hole of flexible displacement meter.The present embodiment, for three samples, is not limited to above-mentioned quantity in practical operation.
(1.2) hole
Be set up brill mounting hole in the mounting hole site of the bamboo composite pressure tube outer surface of nominal diameter 300mm, the gauge length wherein between position of mounting hole is greater than the gauge length of flexible displacement meter, and is less than the maximum range of flexible displacement meter.
(1.3) install
Be arranged on the outside surface of sample by mounting hole after flexible displacement meter being pulled in advance the gauge length between two position of mounting hole, to ensure that flexible displacement meter can measure the distortion of stretching or compression direction, flexible displacement meter adopts trip bolt to be fixed installation.
(2) zeroing process
After step (1.1)-(1.3) complete, the bamboo composite pressure pipe of nominal diameter 300mm is placed in low temperature frozen soil laboratory, modulation room temperature be 0 DEG C until after the flexible displacement meter stable reading of intelligent digital, adjusting digital flexible displacement meter difference reading is zero, and record microstrain at zero point value, press preservation key and microstrain at zero point is kept in instrument.
(3) linear expansion coefficient test
(3.1) record
To control environment temperature according to test request, often control a temperature, constant temperature time is until after the flexible displacement meter stable reading of intelligent digital, and the test data of the good each test of record, and keep record, environment temperature controls at-20 DEG C ~ about 70 DEG C.
(3.2) test result analysis
Test record the results are shown in Table 2, and as shown in Table 2, the bamboo composite pressure pipeline of nominal diameter 300mm at the same temperature its microstrain absolute difference is more or less the same.According to the test result in table 2, calculate the mean value of three the respective linear expansion coefficient αs of sample under each probe temperature respectively, and the arithmetic mean getting the linear expansion coefficient of three samples is as test result, linear expansion coefficient α is determined by formula (1):
In formula: l
tfor the length of pipeline during t DEG C, unit is mm;
L
0for the length of pipeline during initial testing temperature, unit is mm;
Δ t is temperature variation, and unit is DEG C.
Table 2 test result statistical form
Known according to formula (1), l
t-l
0=α l
0Δ t=Δ l, and microstrain
then pipe line expansion coefficient
the result of calculation of the linear expansion coefficient of the bamboo composite pressure pipe of nominal diameter 300mm is in table 3, and as shown in Table 3, the linear expansion coefficient of the bamboo composite pressure pipe of nominal diameter 300mm is-0.1561 × 10
-6/ DEG C.
Table 3 linear expansion coefficient reckoner
The present invention adopts said method, achieves the quick and precisely measurement of the linear expansion coefficient of bamboo composite pressure pipe, for the measurement of bamboo composite pressure pipe linear expansion coefficient provides strong detection means, for its application in deep seasonal frozen ground provides effective reference.
Those skilled in the art will readily understand; the foregoing is only preferred embodiment of the present invention; not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1., for testing a method for bamboo composite pressure pipe axial line expansion coefficient, it is characterized in that, comprise the steps:
(1) prepare before test: bamboo composite pressure pipe to be tested is radially cut out the identical sample of multiple axial length; Rule and on above-mentioned each bar line, mark two for installing the position of mounting hole of flexible displacement meter every 180 ° along tubing is axial at the outside surface of described multiple sample respectively; Gauge length between described position of mounting hole is greater than the gauge length of described flexible displacement meter, and is less than the maximum range of described flexible displacement meter; Be set up in described mounting hole site and drill through mounting hole, be arranged on the outside surface of described sample by described mounting hole after described flexible displacement meter being pulled in advance the gauge length between described position of mounting hole;
(2) zeroing process: the sample being provided with flexible displacement meter is placed in low temperature frozen soil environment, adjustment room temperature be 0 DEG C until described flexible displacement meter stable reading after, the shift differences reading of described flexible displacement meter is adjusted to zero;
(3) linear expansion coefficient test: to control environment temperature according to test request, often controls a temperature, constant temperature a period of time until after described flexible displacement meter stable reading, record and the shift value preserved corresponding to each test; Calculate and obtain described each sample linear expansion coefficient α separately, and the arithmetic mean getting the linear expansion coefficient of multiple sample is as test result, in this way, completes the quick test of bamboo composite pressure pipe linear expansion coefficient.
2. as claimed in claim 1 for testing the method for bamboo composite pressure pipe axial line expansion coefficient, it is characterized in that, described linear expansion coefficient α is determined by formula (1):
In formula: l
tfor the length of pipeline during t DEG C, unit is mm;
L
0for the length of pipeline during initial testing temperature, unit is mm;
Δ t is temperature variation, and unit is DEG C.
3. as claimed in claim 1 or 2 for testing the method for bamboo composite pressure pipe axial line expansion coefficient, it is characterized in that, when described flexible displacement meter is installed, need ensure that this flexible displacement meter can measure the distortion of its stretching or compression direction.
4. as claimed in claim 3 for testing the method for bamboo composite pressure pipe axial line expansion coefficient, it is characterized in that, described environment temperature is-20 DEG C ~ 70 DEG C.
5. as claimed in claim 4 for testing the method for bamboo composite pressure pipe axial line expansion coefficient, it is characterized in that, described flexible displacement meter adopts trip bolt to fix.
6. the method for testing bamboo composite pressure pipe axial line expansion coefficient as described in claim 4 or 5, it is characterized in that, described sample is preferably three.
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| CN106940945A (en) * | 2017-03-17 | 2017-07-11 | 安徽工程大学 | Temperature stress experimental rig |
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Effective date of registration: 20230301 Address after: 311122 No. 29-16, Jiaqi Road, Xianlin Street, Yuhang District, Hangzhou, Zhejiang Patentee after: Zhonglin Xinzhou Bamboo Winding Development Co.,Ltd. Address before: 311115 No.6 Xiuyan Road, Fengdu village, Pingyao Town, Yuhang District, Hangzhou City, Zhejiang Province Patentee before: ZHEJIANG XINZHOU BAMBOO-BASED COMPOSITES TECHNOLOGY Co.,Ltd. Patentee before: Ye Ling |