CN105067660B - A kind of method for testing bamboo composite pressure pipe axial direction linear expansion coefficient - Google Patents
A kind of method for testing bamboo composite pressure pipe axial direction linear expansion coefficient Download PDFInfo
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- CN105067660B CN105067660B CN201510518891.4A CN201510518891A CN105067660B CN 105067660 B CN105067660 B CN 105067660B CN 201510518891 A CN201510518891 A CN 201510518891A CN 105067660 B CN105067660 B CN 105067660B
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Abstract
The invention discloses a kind of method for testing bamboo composite pressure pipe axial direction linear expansion coefficient, it comprises the following steps：Bamboo composite pressure pipe to be tested is radially cut out into multiple axial length identical samples；Rule in the outer surface of multiple samples and carry out mark；Mounting hole is drilled through on the sample for carry out mark；It is arranged on after flexible displacement meter is pulled into certain length in advance on the outer surface of sample；Sample is placed in low temperature frozen soil environment, its shift differences reading, until after the stable reading of flexible displacement meter, is adjusted to zero by adjustment room temperature for 0 DEG C；Environment temperature is controlled according to test request, records the shift value under each test temperature；The respective linear expansion coefficient α of each sample is calculated, takes the arithmetic mean of instantaneous value of linear expansion coefficient of multiple samples to complete the test of bamboo composite pressure pipe linear expansion coefficient as test result with this.The quick measurement of the achievable bamboo composite pressure pipe linear expansion coefficient of the present invention, accurately and reliably, measurement efficiency is high for measurement result.
Description
Technical field
The invention belongs to pipeline axial direction linear expansion coefficient field of measuring technique, is used to test bamboo more particularly, to one kind
The method of composite pressure pipe axial direction linear expansion coefficient.
Background technology
Bamboo composite pressure pipe is a kind of new pressure pipeline, and it is followed successively by inner liner, increased from inside to outside along caliber direction
Strong layer and external protection coating, wherein, inner liner is the non-woven fabrics and grid cloth for being soaked with resin；Enhancement layer is that bamboo chip is wrapped in inner liner
The bamboo chip layer of upper formation, bonded using binding agent between bamboo chip；External protection coating is the bamboo compound nonwoven cloth or cotton for being soaked with resin
Grid cloth, the novel pressure pipeline have compressive resistance height, good rigidity, insulation, corrosion resistant, current excellent performance, in light weight, installation side
The characteristics such as just, cost is cheap, service life length, can be widely applied to urban water supply and sewerage, water conservancy, field irrigation, at petroleum waste water
The fields such as reason, industrial circulating water.
Linear expansion coefficient, sometimes referred to as linear elasticity coefficient, refer to the percentage that temperature often changes 1 DEG C of duct length change, it
It is to weigh one of important indicator for heat endurance quality of pipeline, average coefficient of linear expansion, refers between temperature t1 and t2, with
The average value of the relative change of the corresponding specimen length of 1 DEG C of temperature change.In bamboo composite pressure pipe actual installation work progress, need
Know its actual linear expansion coefficient, corresponding indemnifying measure is further taken according to linear expansion coefficient, especially applied non-
Under normal temperature environment, the determination to its linear expansion coefficient is even more important.And due to the material composition and other kinds of bamboo composite pressure pipe
Class pipeline is different, in the prior art not a kind of method for being applied to test bamboo composite pressure pipe linear expansion coefficient, therefore, nothing
Method provides data supporting for the actual installation construction of bamboo composite pressure pipe.
The content of the invention
For the disadvantages described above or Improvement requirement of prior art, it is used to test bamboo composite pressure pipe the invention provides one kind
The method of axial linear expansion coefficient, wherein with reference to the characteristics of bamboo composite pressure pipe itself, devise accordingly suitable for measuring it
The method of linear expansion coefficient, and according to the structure and component feature of bamboo composite pressure pipe, to its sampling mode and linear expansion coefficient
Specific test mode studied and designed, can effectively realize accordingly bamboo composite pressure pipe at low ambient temperatures line expand
The quick measurement of coefficient, while also directed to the application environment of bamboo composite pressure pipe, devise the test being consistent with its application environment
Environment, so as to obtain the linear expansion coefficient for meeting the bamboo composite pressure pipe under the conditions of actual environment, have measurement result accurate, survey
The advantages that amount efficiency is high, ginseng is provided in the application of low temperature environment and the installation of practical demonstration engineering for bamboo composite pressure pipe
Examine.
To achieve the above object, the present invention proposes a kind of side for being used to test bamboo composite pressure pipe axial direction linear expansion coefficient
Method, it is characterised in that comprise the following steps：
(1) prepare before test：Bamboo composite pressure pipe to be tested is radially cut out into multiple axial length identicals
Sample；Respectively the outer surface of the multiple sample every 180 ° along tubing axially line and the mark two on above-mentioned each bar line
For installing the position of mounting hole of flexible displacement meter；Gauge length between the position of mounting hole is more than the mark of the flexible displacement meter
Away from, and less than the maximum range of the flexible displacement meter；Mounting hole is drilled through on the position of mounting hole, by the flexible displacement
Meter is arranged on the outer surface of the sample after being pulled to the gauge length between the position of mounting hole in advance by the mounting hole；
(2) zeroing is handled：The sample for installing flexible displacement meter is placed in low temperature frozen soil environment, adjustment room temperature is 0 DEG C
Until after the stable reading of the flexible displacement meter, the shift differences reading of the flexible displacement meter is adjusted to zero；
(3) linear expansion coefficient is tested：Environment temperature is controlled according to test request, often controls a temperature, during one section of constant temperature
Between until after the flexible displacement meter stable reading, record and preserve the shift value that test is corresponding every time；Calculate described in obtaining
Each respective linear expansion coefficient α of sample, and the arithmetic mean of instantaneous value of the linear expansion coefficient of multiple samples is taken as test result, with
This mode, complete the quick test of bamboo composite pressure pipe linear expansion coefficient.
As it is further preferred that the linear expansion coefficient α is determined by formula (1)：
In formula：ltFor t DEG C when pipeline length, unit mm；
l0For initial testing temperature when pipeline length, unit mm；
Δ t is temperature change, and unit is DEG C.
As it is further preferred that when installing the flexible displacement meter, it need to ensure that the flexible displacement meter can measure its drawing
Stretch or the deformation of compression direction.
As it is further preferred that described environment temperature is -20 DEG C~70 DEG C.
As it is further preferred that the flexible displacement meter is fixed using trip bolt.
As it is further preferred that the sample is preferably three.
In general, by the contemplated above technical scheme of the present invention compared with prior art, mainly possess following
Technological merit：
1. the present invention combine bamboo composite pressure pipe using bamboo wood as matrix material, using thermosetting resin as adhesive, using twining
The characteristics of winding technologe is made, the line expansion system suitable for bamboo composite pressure pipe of the measurement with said structure is devised accordingly
The step of counting, linear expansion coefficient especially at low ambient temperatures, testing it is studied with test mode, is the compound pressure of bamboo
The application of solenoid at low ambient temperatures provides data supporting, has measurement effect good, and measurement is accurate, the advantages that efficiency high.
2. selection of the present invention also to such as meter of the critical process in test and meter installation site, fully with reference to bamboo
The design feature of composite pressure pipe, design meets the test mode of its structural requirement, to realize bamboo composite pressure pipe in low temperature ring
The quick measurement of linear expansion coefficient, is measured using flexible displacement meter under border, is also ensured while data accuracy is ensured
It is simple to operate, in addition, present invention is alternatively directed to the application environment of bamboo composite pressure pipe (such as deep seasonal frozen ground), devise with
The test environment that its application environment is consistent so that the actual application environment of test environment and bamboo composite pressure pipe approaches, so as to obtain
The linear expansion coefficient of the bamboo composite pressure pipe under the conditions of actual environment must be met, measurement result is bamboo composite pressure accurately and reliably
The application of pipe at low ambient temperatures provides reference.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to
Limit the present invention.As long as in addition, technical characteristic involved in each embodiment of invention described below each other it
Between do not form conflict can be mutually combined.
The present invention test philosophy be bamboo composite pressure pipe linear deformation be mainly manifested in it is swollen on pipeline axial direction
Swollen extension and the bending of horizontal direction, its swell increment and temperature proportional relation, bamboo composite pressure of the present invention in certain length
Reconnaissance on pipe, drilling, the digital flexible displacement meter of JMDL-24XX Series Intelligents is arranged on bamboo composite pressure pipe, then by bamboo
Composite pressure pipe is placed in thermostatic chamber constant temperature certain time, after the intelligent digital flexibility displacement meter stable reading for measuring length change,
Reading is recorded, by the swell value and shrinkage value of sample, calculates the average coefficient of linear expansion of sample, the experiment is in controllable low temperature chamber
Carried out with YH841- special types far infrared air-blowing drying box.
It is digital flexible that the tester of the present invention mainly includes JMZX-300X comprehensive testers, JMDL-24XX Series Intelligents
Displacement meter, PT100 temperature sensors, portable logging and YH841- special type far infrared air-blowing drying boxes.
The JMZX-300X comprehensive tester performance indications parameters of table 1
JMZX-300X comprehensive testers are a kind of portable, multi-functional, intelligent reading instrument, and the instrument can sense to firm string
Device, inductance fm class sensor measure, and have the characteristics that detection speed is fast, precision is high, easy to use, its main property
Energy index is shown in Table 1.
The digital flexible displacement meter of JMDL-24XX Series Intelligents is inductance fm class sensor, is had the characteristics that：Using electricity
Sensor frequency modulation principle design feature, there is high sensitivity, high accuracy, high stability, temperature influence the advantages that small, suitable for long-term
Observation；Storaging chip built in flexible sensor for measuring bit shift, there is intelligent memory functional, and measurement result needed for 600 times can be preserved (such as
Time of measuring, measuring point temperature, absolute displacement, relative displacement, zero point value etc.)；Using all-digital detection, signal long-distance transmits not
Distortion, strong antijamming capability；Insulating properties is good, waterproof durable；Unattended duty can be realized by being equipped with JMZX-300X integrated test systems
Measurement and remote monitoring.
PT100 temperature sensors are placed in bamboo composite pressure pipe outer wall and inwall, real inside and outside bamboo composite pressure pipe for measuring
The environment temperature on border and and the temperature comparisons that show of the flexible displacement meter of JMDL-24XX Series Intelligents number.Portable logging is used
To measure the temperature of PT100 temperature sensors inside and outside bamboo composite pressure pipe.YH841- special type far infrared air-blowing drying boxes, heat work(
Rate 18KW, work chamber size are 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 direction linear expansion coefficient of the present invention, it mainly includes following step
Suddenly：Prepare before test, zeroing is handled and linear expansion coefficient test.
(1) prepare before test
(1.1) sample preparation and reconnaissance
The present embodiment is so that nominal diameter is 300mm bamboo composite pressure pipe as an example, by bamboo composite pressure pipe edge to be tested
Its radial cuts goes out multiple axial length identical samples；According to test request nominal diameter 300mm bamboo composite pressure pipe
Outer surface, axially rule along tubing every 180 °, and mark two on each line and be used to the peaces of flexible displacement meter are installed
Fill hole site.The present embodiment is not limited to above-mentioned quantity by taking three samples as an example, in practical operation.
(1.2) drill
Mounting hole, wherein mounting hole are bored on the position of mounting hole of nominal diameter 300mm bamboo composite pressure tube outer surface
Gauge length between position is more than the gauge length of flexible displacement meter, and less than the maximum range of flexible displacement meter.
(1.3) install
Sample is arranged on by mounting hole after the gauge length that flexible displacement meter is pulled between two position of mounting hole in advance
On outer surface, to ensure that flexible displacement meter can measure stretching or the deformation of compression direction, flexible displacement meter are entered using trip bolt
Row is fixedly mounted.
(2) zeroing is handled
After the completion of step (1.1)-(1.3), nominal diameter 300mm bamboo composite pressure pipe is placed in low temperature frozen soil experiment
In room, modulation room temperature, until after intelligent digital flexibility displacement meter stable reading, adjusts digital flexible displacement meter difference reading for 0 DEG C
It is zero, and records zero point microstrain value, presses preservation key and zero point microstrain is stored in instrument.
(3) linear expansion coefficient is tested
(3.1) record
Environment temperature is controlled according to test request, often controls a temperature, constant temperature time is until intelligent digital flexibility displacement
After counting stable reading, the good test data tested every time of record, and record is kept, environment temperature is controlled at -20 DEG C~70 DEG C
Left and right.
(3.2) test result analysis
Test record the results are shown in Table 2, and as shown in Table 2, nominal diameter 300mm bamboo composite pressure pipeline is at the same temperature
Its microstrain absolute difference is more or less the same.According to the test result in table 2, three samples are calculated respectively under each test temperature
Respective linear expansion coefficient α average value, and take the arithmetic mean of instantaneous value of the linear expansion coefficient of three samples as test result,
Linear expansion coefficient α is determined by formula (1)：
In formula：ltFor t DEG C when pipeline length, unit mm；
l0For initial testing temperature when pipeline length, unit mm；
Δ t is temperature change, and unit is DEG C.
The test result statistical form of table 2
Understood according to formula (1), lt-l0=α l0Δ t=Δ l, and microstrainThen pipe line is swollen
Swollen coefficientThe result of calculation of the linear expansion coefficient of nominal diameter 300mm bamboo composite pressure pipe is shown in Table 3, by
Table 3 understands that the linear expansion coefficient of nominal diameter 300mm bamboo composite pressure pipe is -0.1561 × 10-6/℃。
The linear expansion coefficient computational chart of table 3
The present invention uses the above method, realizes the quick and precisely measurement of the linear expansion coefficient of bamboo composite pressure pipe, is bamboo
The measurement of composite pressure pipe linear expansion coefficient provides strong detection means, and being it, applying in deep seasonal frozen ground provides
Effective reference.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, all any modification, equivalent and improvement made within the spirit and principles of the invention etc., all should be included
Within protection scope of the present invention.
Claims (5)
- A kind of 1. method for testing bamboo composite pressure pipe axial direction linear expansion coefficient, it is characterised in that comprise the following steps：(1) prepare before test：Bamboo composite pressure pipe to be tested is radially cut out into multiple axial length identical samples； Axially rule along tubing every 180 ° in the outer surface of the multiple sample respectively and mark two is used to install on each bar line The position of mounting hole of flexible displacement meter；Gauge length between the position of mounting hole is more than the gauge length of the flexible displacement meter, and small In the maximum range of the flexible displacement meter；Mounting hole is drilled through on the position of mounting hole, by the flexible displacement meter prestretching It is arranged on after gauge length between to the position of mounting hole by the mounting hole on the outer surface of the sample；(2) zeroing is handled：The sample for installing flexible displacement meter is placed in low temperature frozen soil environment, adjustment room temperature be 0 DEG C until After the stable reading of the flexible displacement meter, the shift differences reading of the flexible displacement meter is adjusted to zero；(3) linear expansion coefficient is tested：Environment temperature is controlled according to test request, the environment temperature is -20 DEG C~70 DEG C, is often controlled A temperature is made, constant temperature until after the flexible displacement meter stable reading, is recorded and preserved corresponding to test every time for a period of time Shift value；Calculate and obtain each respective linear expansion coefficient α of sample, and take the arithmetic average of the linear expansion coefficient of multiple samples Value is used as test result, in this way, completes the quick test of bamboo composite pressure pipe linear expansion coefficient.
- 2. the method as claimed in claim 1 for being used to test bamboo composite pressure pipe axial direction linear expansion coefficient, it is characterised in that institute Linear expansion coefficient α is stated to be determined by formula (1)：<mrow> <mi>&alpha;</mi> <mo>=</mo> <mfrac> <mrow> <msub> <mi>l</mi> <mi>t</mi> </msub> <mo>-</mo> <msub> <mi>l</mi> <mn>0</mn> </msub> </mrow> <mrow> <msub> <mi>l</mi> <mn>0</mn> </msub> <mo>&CenterDot;</mo> <mi>&Delta;</mi> <mi>t</mi> </mrow> </mfrac> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>1</mn> <mo>)</mo> </mrow> </mrow>In formula：ltFor t DEG C when pipeline length, unit mm；l0For initial testing temperature when pipeline length, unit mm；Δ t is temperature change, and unit is DEG C.
- 3. the method as claimed in claim 1 or 2 for being used to test bamboo composite pressure pipe axial direction linear expansion coefficient, its feature exist In, install the flexible displacement meter when, need to ensure the flexible displacement meter can measure its stretching or compression direction deformation.
- 4. the method as claimed in claim 3 for being used to test bamboo composite pressure pipe axial direction linear expansion coefficient, it is characterised in that institute Flexible displacement meter is stated to fix using trip bolt.
- 5. the method as claimed in claim 4 for being used to test bamboo composite pressure pipe axial direction linear expansion coefficient, it is characterised in that institute Sample is stated as three.
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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 |
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