WO2017031820A1 - 一种用于确定竹复合压力管短时失效水压的检测方法 - Google Patents

一种用于确定竹复合压力管短时失效水压的检测方法 Download PDF

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WO2017031820A1
WO2017031820A1 PCT/CN2015/092337 CN2015092337W WO2017031820A1 WO 2017031820 A1 WO2017031820 A1 WO 2017031820A1 CN 2015092337 W CN2015092337 W CN 2015092337W WO 2017031820 A1 WO2017031820 A1 WO 2017031820A1
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bamboo composite
pressure pipe
composite pressure
pressure
short
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PCT/CN2015/092337
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English (en)
French (fr)
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叶柃
朱鑫
张淑娴
牛琳
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浙江鑫宙竹基复合材料科技有限公司
叶柃
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Publication of WO2017031820A1 publication Critical patent/WO2017031820A1/zh

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
    • G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
    • G01N3/12—Pressure testing

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  • the invention belongs to the technical field of bamboo composite pressure pipe, and more particularly to a detection method for determining short-time failure water pressure of a bamboo composite pressure pipe.
  • bamboo materials are renewable green materials.
  • bamboo composite pressure pipe related technologies for example, Chinese patent documents CN101571213A, CN202327397U
  • bamboo composite pipes as a pipe capable of withstanding a certain pressure, in the water supply and drainage Engineering, farmland irrigation, petrochemical anti-corrosion and other occasions can generally replace traditional pipes such as polyvinyl chloride pipe, polyethylene pipe, glass steel pipe, cement pipe, spiral welded pipe, ductile iron pipe, etc., and have good application prospects.
  • any failure of the following conditions under the action of internal water pressure is: (1) instantaneous or rapid pressure relief (such as blasting); (2) observable leakage of pipe wall; (3) uniform and continuous Depressurization that is interrupted by the pressurization process (such as leakage, etc.).
  • the short-time hydraulic failure pressure parameter of the water pipeline is one of the important parameters of the pipeline, which embodies the internal pressure bearing performance of the pipeline; due to the short-time failure water pressure The parameters are an important manifestation of the performance of the pipeline.
  • the related prior art stipulates the test method for short-time failure water pressure, for example, to regulate the short-term water pressure of the fiber-reinforced thermosetting plastic pipe.
  • GB/T 5351 issued by the failure pressure test method.
  • the bamboo composite pressure tube is made of a bamboo material winding process, and the existing The short-time failure water pressure detection method is very easy to damage the bamboo composite pressure pipe (such as bamboo material layer, resin adhesive, etc. in the bamboo composite pressure pipe) during the detection process (this damage is not detected by short-time failure water pressure).
  • the destructive operation of the method itself such as the pressurization operation, affects the accuracy of the short-term failure water pressure results.
  • an object of the present invention is to provide a detection method for determining a short-time failure water pressure of a bamboo composite pressure pipe, wherein a critical process step, such as a sample detection step, The selection rules of the sample are improved, and the problem that the bamboo composite pressure pipe is damaged during the detection process and the short-time failure water pressure result is inaccurate is effectively solved, and the method avoids direct detection of the large diameter.
  • the bamboo composite pressure pipe greatly reduces the test conditions for the large-diameter bamboo composite pressure pipe, and can achieve the technical effect of simplifying the actual detection.
  • a method for detecting a short-time failure water pressure of a bamboo composite pressure pipe which comprises the following steps:
  • a section of a bamboo composite pressure pipe is used as a sample tube, and a sealing device is attached to both ends of the sample tube, the sealing device is a restraining end sealing device; then, the sealing device is connected to the pressurized system, and Filling the sample tube with water to control the water flow, so that the sample tube is filled with water and excluding air within 5 min; supporting the sealing device to make the sample tube in a horizontal state; then, through the pressurization
  • the system pressurizes the sample tube uniformly and continuously until the sample tube fails, and records the pressure P at the time of failure, which is the short-time failure water pressure of the sample tube.
  • the bamboo composite pressure pipe sample pipe is a bamboo composite pressure pipe to be tested or a bamboo composite pressure pipe contraction pipe corresponding to the bamboo composite pressure pipe to be tested, and the composite pressure of the bamboo to be tested is recorded.
  • the nominal diameter of the tube is D N ,
  • the bamboo composite pressure pipe to be tested is used as the sample tube, and the pressure P is the short-time failure water pressure of the bamboo composite pressure pipe to be tested;
  • the bamboo composite pressure tube is used as the sample tube;
  • the ratio of the ring stiffness of the bamboo composite pressure pipe to be measured to the stiffness of the bamboo composite pressure pipe is ⁇ ;
  • ⁇ P is the short-time failure water pressure of the composite pressure pipe to be tested.
  • the ratio of the pressure level of the bamboo composite pressure pipe to be tested to the pressure level of the bamboo composite pressure pipe is greater than ⁇ .
  • the bamboo composite pressure tube has a nominal diameter D N ' of not less than 200 mm.
  • the pressurization system is an electric pressure test pump or a nitrogen bottle supply system with a pressure regulator and a hydraulic accumulator.
  • the pressurization time for the pressurization is 60 s to 70 s.
  • the sample tube is placed in an air environment of 21 ° C to 25 ° C for at least 16 h before the sealing device is stuck.
  • the edge of the sealing plug that is in contact with the sample tube is chamfered.
  • the detecting method can be combined with the characteristics of the bamboo composite pressure pipe to obtain more accurate. Short-term failure water pressure results.
  • the invention controls the water inlet time of the bamboo composite pressure pipe within 5 min, reduces the interference of the water body on the bamboo composite pressure pipe on the basis of ensuring the water filling effect, and eliminates the conventional non-destructive operation during the detection process ( Other operations other than pressurization) adversely affect the structure of the bamboo composite pressure pipe (such as a bamboo material layer, a resin layer, etc.).
  • the water inlet time is often changed according to the water flow rate of the water filled into the pipeline per unit time and the diameter and length of the pipe to be tested.
  • the invention can reduce the time for the water body to cause pressure on the bamboo composite pressure pipe, thereby reducing the influence on the inner layer structure, so that the detection is obtained.
  • the short-term failure water pressure is more accurate.
  • the present invention adopts a bamboo composite pressure tube proportional tube as a sample tube for the large-diameter bamboo composite pressure pipe to be tested, and detects the short-time failure water pressure of the bamboo composite pressure tube.
  • the short-time failure water pressure of the large-diameter bamboo composite pressure pipe to be tested can be obtained, the requirement for the detection condition is lowered, the sample tube is convenient to be loaded and unloaded, the detection cost can be greatly reduced, and the actual detection operation can be simplified.
  • the other parameters are also proportionally reduced with the composite pressure pipe to be tested.
  • the present invention further defines that the nominal diameter of the bamboo composite pressure tube is not less than 200 mm, so that the nominal diameter of most of the sample tubes can be controlled within the range of 200 mm to 500 mm, and the maximum diameter can be used for detecting the nominal diameter.
  • the 3000mm bamboo composite pressure pipe to be tested can meet the testing requirements of most bamboo composite pressure pipes.
  • the nominal diameter range of the sample tube corresponds to the detection condition in which the water inlet time is controlled within 5 minutes, and it is not necessary to greatly improve the water inlet system in the short-time failure water pressure detection system to satisfy various large tubes.
  • the detection of the bamboo composite pressure pipe is required, and the water filling rate of the water inlet system is relatively stable, which is very convenient for practical operation.
  • the edge of the sealing plug contacting the sample tube is chamfered so that the sealing plug does not damage the inner liner of the bamboo composite pressure tube.
  • the invention improves the detection step of the bamboo composite pressure pipe sample, and controls the water inlet time within 5 minutes, and adopts the corresponding bamboo composite pressure pipe for the large-diameter bamboo composite pressure pipe to be tested.
  • the reduction tube is tested as a sample tube, and the sample pressure is uniformly and continuously pressurized until the sample fails (such as water leakage in the tube wall, instantaneous or rapid pressure relief), and the data of the failure pressure, that is, the short-time failure water pressure is obtained.
  • Fig. 1 is a schematic flow chart of a method for detecting short-time failure water pressure of a bamboo composite pressure pipe.
  • Figure 1 is a schematic flow chart showing the method for detecting the short-time failure water pressure of a bamboo composite pressure pipe.
  • the nominal diameter D N of the bamboo composite pressure pipe to be tested is 300 mm, and the pressure level is 0.8 MPa, then G1 is the sample S1.
  • the sealing device was placed in an air environment at 25 ° C for 16 h, and then a sealing device was attached to both ends of the sample S1, the sealing device was provided with a sealing plug, and the edge of the sealing plug in contact with S1 was chamfered. Supporting the sealing device to make the sample S1 in a horizontal state, the sealing device is a restraining end sealing device; then, the sealing device is connected with a pressurizing system, which is an electric pressure test pump, and then charges the sample Water, the sample is filled with water and exhausted air; the sample from the beginning of water filling to the water filling time is 5min;
  • the pressurization system uniformly presses continuously until the sample S1 fails, and the pressurization time is 60 s; the pressure P, P at the time of failure is recorded as the short-time failure water pressure of the bamboo composite pressure pipe G1 to be tested.
  • the P of S1 is 3.325 MPa, which is not less than 4 times the pipeline pressure rating (0.8 MPa).
  • the nominal diameter D N of the bamboo composite pressure pipe to be tested is 800 mm
  • the pressure rating is 0.6 MPa
  • the ring stiffness is measured to be 8240 N/m 2
  • G2 is taken as the sample S2.
  • pressure rating is 0.3MPa
  • ring stiffness is 4120N/m 2
  • G2' is taken as sample S2';
  • the sealing device is a constraining end sealing device; then, the sealing device is in communication with a pressurizing system, which is a nitrogen bottle pressure supply system with a pressure regulator and a hydraulic accumulator, and then respectively
  • a pressurizing system which is a nitrogen bottle pressure supply system with a pressure regulator and a hydraulic accumulator, and then respectively
  • the samples S2 and S2' were filled with water so that the samples S2 and S2' were filled with water and exhausted; the samples S2 and S2' were filled with water from the beginning to the water filling time of 3 min;
  • the short-time failure water pressure test (P 0 ) of the tube G2 is obtained by multiplying the result of the short-time failure hydraulic pressure test by the reduction ratio tube G2' (ie ⁇ P). .
  • sealing devices were all constrained end sealing devices; then, the sealing device is connected to the pressurized system, and then the samples S3 and S3' are respectively filled with water, so that the samples S3 and S3' are filled with water and exhausted air; Samples S3 and S3' are filled with water from the beginning to fill the water for 5 min;
  • the nominal diameter D N of the bamboo composite pressure pipe to be tested is 1000 mm
  • the pressure rating is 1.2 MPa
  • the ring stiffness is measured to be 13124 N/m 2
  • G4 is taken as the sample S4.
  • the ratio of the grade and the ring stiffness is 3, and G4' is taken as the sample S4';
  • sealing devices were all constrained end sealing devices; then, the sealing device is connected to the pressurized system, and then the samples S4 and S4' are respectively filled with water, so that the samples S4 and S4' are filled with water and exhausted air; Samples S4 and S4' are filled with water from the beginning to fill the water for 3 min;
  • the nominal diameter D N of the bamboo composite pressure pipe to be tested is 1800 mm
  • the pressure rating is 0.4 MPa
  • the ring stiffness is measured to be 6173 N/m 2
  • G5 is taken as the sample S5.
  • the ratio of diameter, pressure level and ring stiffness is 6, and G5' is taken as sample S5';
  • the pressurization system is uniformly and continuously pressurized until the samples S5 and S5'fail; the pressurization times of the samples S5 and S5' are both 70 s; the short-time failures of the samples S5 and S5' are recorded respectively.
  • the water pressure P 0 is 1.748 MPa
  • P is 0.289 MPa
  • the ratio of the two is 6.048
  • the difference factor of the scale factor is 0.8%, the difference is less than 1%.
  • the bamboo composite pressure pipe (including the bamboo composite pressure pipe to be tested and the bamboo composite pressure pipe reduction pipe) can be tested by the following methods:
  • test equipment, test environment and samples are in accordance with the provisions of GB/T 5352, and the loading speed is determined according to equation (1).
  • V loading speed, taking an integer.
  • the pipe diameter is larger than 500mm, it can be repaired to a single digit of 0 or 5, and the unit is millimeter per minute (mm/min);
  • T the actual test thickness of the pipe wall, in millimeters (mm);
  • ⁇ y the amount of change in tube diameter, take 3% of the diameter of the sample, in meters (m);
  • F Line load corresponding to ⁇ y in units of cattle per meter (N/m).
  • the reduction tube of the present invention can also be designed according to the production process experience, according to the nominal diameter, ring stiffness, pressure level and the like of the reduction tube, the structure of the reduction tube (such as wall thickness, internal layup, etc.). In order to directly produce the bamboo composite pressure tube shrinkage tube that meets the requirements.
  • the outer diameter can be measured according to the method in GB/T 5351 as the final result of the outer diameter measurement; the length between the two sealing segments of the sample tube can refer to the GB/T 5351 Mode setting.
  • the short-time failure water pressure requirement of the bamboo composite pressure pipe may be changed according to the application conditions of the bamboo composite pressure pipe, the short-time failure water pressure of the bamboo composite pressure pipe generally detected by the invention is not less than the pipeline pressure level. 4 times to meet unexpected exceptions in pipeline applications.

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Abstract

一种用于确定竹复合压力管短时失效水压的检测方法，包括以下步骤：将试样管卡上密封装置，然后与加压系统连通并充水，对试样管进行加压直至失效；其中作为试样管的竹复合压力管既可以是待测的竹复合压力管，也可以是与该待测竹复合压力管对应的竹复合压力管缩比管。上述方法通过对试样的检测步骤、试样的选取规则等进行改进，能够有效解决竹复合压力管在检测过程中受损致使短时失效水压结果不准确的问题，并且该方法避免了直接检测大管径竹复合压力管，大大降低了对大管径竹复合压力管的试验条件要求，能够达到简化实际检测的技术效果。

Description

一种用于确定竹复合压力管短时失效水压的检测方法 【技术领域】
本发明属于竹复合压力管技术领域，更具体地，涉及一种用于确定竹复合压力管短时失效水压的检测方法。
【背景技术】
竹材料是可再生的绿色环保材料，近年来随着竹复合压力管相关技术的日益成熟(例如，中国专利文献CN101571213A、CN202327397U)，竹复合管作为一种能够承受一定压力的管道，在给排水工程、农田灌溉、石油化工防腐等场合中能够普遍替代聚氯乙烯管、聚乙烯管、玻璃钢管、水泥类管、螺旋焊管、球墨铸铁管等传统管道，具有良好的应用前景。
管道在内水压作用下出现以下任意一种情况即为失效：(1)瞬时或快速泄压现象(如爆破等)；(2)可观察到的管壁漏水现象；(3)引起均匀连续加压过程中断的降压现象(如渗漏等)。输水管道的短时失效水压(即短时水压失效压力，short-time hydraulic failure pressure)参数是管道的重要参数之一，它体现了管道的内压承受性能；由于短时失效水压参数是管道性能的重要体现，为规范短时失效水压的检测，相关现有技术也对短时失效水压的试验方法进行了相关规定，例如，为规范纤维增强热固性塑料管短时水压失效压力试验方法出台的GB/T 5351。
尽管现有技术中已对短时失效水压的检测方法进行了相关国家规定，但与包括纤维增强热固性塑料管在内的管道不同，竹复合压力管由于是采用竹材料缠绕工艺，现有的短时失效水压检测方法在检测过程中非常容易对竹复合压力管(如竹复合压力管中的竹材料层、树脂粘接剂等)造成破坏(这种破坏并非由短时失效水压检测方法本身的破坏性操作，如加压操作造成)，影响短时失效水压结果的准确性。而另一方面，在利用现有的 检测方法在对竹复合压力管进行检测时，由于短时失效水压的试验过程中需要配备安全防护设施，而管径越大，短时失效水压试验的条件就越苛刻，非常不利于短时失效水压的实际操作。此外，大管径的竹复合压力管在进行短时失效水压试验时，由于短时失效水压试验对试样端面的几何参数要求严格，而在试验中大管径的竹复合压力管也存在装卸不便的困难。
【发明内容】
针对现有技术的以上缺陷或改进需求，本发明的目的在于提供一种用于确定竹复合压力管短时失效水压的检测方法，其中通过对其关键的工艺步骤譬如试样的检测步骤、试样的选取规则等进行改进，与现有技术相比能够有效解决竹复合压力管在检测过程中受损致使短时失效水压结果不准确的问题，并且该方法避免了直接检测大管径竹复合压力管，大大降低了对大管径竹复合压力管的试验条件要求，能够达到简化实际检测的技术效果。
为实现上述目的，按照本发明，提供了一种用于确定竹复合压力管短时失效水压的检测方法，其特征在于，包括以下步骤：
将一段竹复合压力管作为试样管，在所述试样管的两端卡上密封装置，所述密封装置为约束端密封装置；然后，将所述密封装置与加压系统连通，并向所述试样管中充水，控制水流量，使所述试样管在5min内充满水并排除空气；支撑所述密封装置使所述试样管处于水平状态；接着，通过所述加压系统对所述试样管均匀连续的加压，直至所述试样管失效，记录失效时的压力P，该压力P即为该试样管的短时失效水压。
作为本发明的进一步优选，所述竹复合压力管试样管为待测竹复合压力管或者与该待测竹复合压力管对应的竹复合压力管缩比管，记所述待测竹复合压力管的公称直径为DN，
当DN小于等于500mm时，则将所述待测竹复合压力管作为所述试样管，所述压力P即为该待测竹复合压力管的短时失效水压；
当DN大于500mm时，则将所述竹复合压力管缩比管作为所述试样管；
所述待测竹复合压力管的公称直径DN与所述竹复合压力管缩比管的公称直径DN’的比值λ满足λ＝DN:DN’＝(2～6)，所述待测竹复合压力管的环刚度与所述竹复合压力管缩比管环刚度的比值为λ；λ×P即为所述待测竹复合压力管的短时失效水压。
作为本发明的进一步优选，所述待测竹复合压力管的压力等级与所述竹复合压力管缩比管压力等级的比值为λ。
作为本发明的进一步优选，所述竹复合压力管缩比管的公称直径DN’不小于200mm。
作为本发明的进一步优选，所述加压系统为电动试压泵或者带有压力调节器和液压蓄存器的氮气瓶供压系统。
作为本发明的进一步优选，所述加压所用的加压时间为60s～70s。
作为本发明的进一步优选，所述试样管在卡上所述密封装置之前，在21℃～25℃的空气环境中至少放置了16h。
作为本发明的进一步优选，所述约束端密封装置采用密封塞密封时，所述密封塞与所述试样管相接触的边缘进行倒角处理。
通过本发明所构思的以上技术方案，与现有技术相比，通过对短时失效水压检测方法的各个操作步骤进行改进，使该检测方法能够结合竹复合压力管的特点，得到更为准确的短时失效水压结果。
本发明将竹复合压力管的进水时间控制在5min之内，在确保充水效果的基础上，减小了水体对竹复合压力管的干扰，排除了检测过程中常规的非破坏性操作(除加压外的其他操作)对竹复合压力管的结构(如竹材料层、树脂层等)的不利影响。现有的管道短时失效水压检测中，进水时间往往是根据单位时间内向管道里充水的水流量和待测管径及长度的大小而变化。本发明通过对竹复合压力管的进水时间进行限制，能够减少水体对竹复合压力管造成压力的时间，进而减少对其内层结构的影响，使检测得 出的短时失效水压更加准确。
优选的，本发明对于大管径的待测竹复合压力管，采用与其对应的竹复合压力管缩比管作为试样管，通过检测该竹复合压力管缩比管的短时失效水压，就能够得出待测的大管径竹复合压力管的短时失效水压，降低了对检测条件的要求，试样管装卸方便，可大大减少检测成本，简化实际检测操作。竹复合压力管缩比管除公称直径外，其他参数(如环刚度、压力等级等)也与待测竹复合压力管呈等比例缩小。此外，本发明还进一步限定了竹复合压力管缩比管的公称直径不小于200mm，因此可将大部分试样管的公称直径控制在200mm～500mm的范围内，并且最大可用于检测公称直径达3000mm的待测竹复合压力管，能够满足大部分竹复合压力管的检测需求。另外，将试样管的公称直径范围与进水时间控制在5min之内的检测条件相对应，无须对短时失效水压检测系统中的进水系统作大的改进即可满足各种大管径竹复合压力管的检测需要，并且进水系统的充水速率相对稳定，非常便于实际操作。另外，约束端密封装置采用密封塞密封时，所述密封塞与所述试样管相接触的边缘进行倒角处理，以使该密封塞卡入时不会破坏竹复合压力管内衬层。
综上，本发明通过对竹复合压力管试样的检测步骤进行改进，将进水时间控制在5分钟之内，并且对于大管径的待测竹复合压力管采用与其对应的竹复合压力管缩比管作为试样管进行检测，通过对试样管均匀、连续加压，直至试样失效(如管壁漏水，瞬时或快速泄压)，得到失效压力即短时失效水压的数据。
【附图说明】
图1是检测竹复合压力管短时失效水压方法的流程示意图。
【具体实施方式】
为了使本发明的目的、技术方案及优点更加清楚明白，以下结合附图及实施例，对本发明进行进一步详细说明。应当理解，此处所描述的具体 实施例仅仅用以解释本发明，并不用于限定本发明。此外，下面所描述的本发明各个实施方式中所涉及到的技术特征只要彼此之间未构成冲突就可以相互组合。
实施例1
图1所示为检测竹复合压力管短时失效水压方法的流程示意图。
待测竹复合压力管G1公称直径DN为300mm，压力等级0.8MPa，则G1即为试样S1。
将S1在25℃的空气环境中放置16h，然后在试样S1两端卡上密封装置，该密封装置带有密封塞，该密封塞与S1相接触的边缘做了倒角处理。支撑所述密封装置使试样S1处于水平状态，所述密封装置为约束端密封装置；接着，将密封装置与加压系统连通，该加压系统为电动试压泵，然后向试样里充水，使试样里充满水并排尽空气；试样从开始充水到充满水的进水时间为5min；
通过所述加压系统均匀连续的加压，直至试样S1失效，加压时间为60s；记录失效时的压力P，P即为待测竹复合压力管G1的短时失效水压。
S1的P为3.325MPa，不小于管道压力等级(0.8MPa)的4倍。
实施例2
待测竹复合压力管G2公称直径DN为800mm，压力等级0.6MPa，测得其环刚度为8240N/m2，将G2作为试样S2。另外，选取缩比比例为2：1(即比例因子λ＝DN:DN’＝2)的竹复合压力管作为管G2的缩比管G2’，管G2’的公称直径DN’为400mm，压力等级为0.3MPa，环刚度为4120N/m2，将G2’作为试样S2’；
将S2和S2’在25℃的空气环境中放置16h，然后分别在试样S2和S2’的两端卡上密封装置，支撑所述密封装置使试样S2和S2’均处于水平状态，所述密封装置均为约束端密封装置；接着，将密封装置与加压系统连通，该加压系统为带有压力调节器和液压蓄存器的氮气瓶供压系统，然后分别 向试样S2和S2’里充水，使试样S2和S2’里均充满水并排尽空气；试样S2和S2’从开始充水到充满水的进水时间均为3min；
通过所述加压系统均匀连续的加压，直至所述试样S2和S2’失效；试样S2和S2’的加压时间均为70s；分别记录试样S2和S2’失效时的压力P0为2.509MPa，P为1.256MPa，P0和P即为管G2和管G2’的短时失效水压。可以看出，P0和P均大于相应压力等级的四倍(管G2’的压力等级为0.3MPa)，并且P0与P的比值为1.998，几乎等于比例因子2，与比例因子相差比例因子的0.1％，小于1％，可见，用缩比管G2’进行短时失效水压试验结果乘以比例因子λ后(即λ×P)则为管G2的短时失效水压(P0)。
实施例3
待测竹复合压力管G3，公称直径DN为800mm，压力等级为0.6MPa，测得其环刚度为8240N/m2，将G3作为试样S3。另外，选取管G3的竹复合压力管缩比管G3’，G3’管的公称直径DN’＝200mm，缩比比例为4:1(即比例因子λ＝DN:DN’＝4)，G3与G3’两者的公称直径、压力等级、环刚度比值均为4，将G3’作为试样S3’；
将S3和S3’在25℃的空气环境中放置16h，然后分别在试样S3和S3’的两端卡上密封装置，支撑所述密封装置使试样S3和S3’均处于水平状态，所述密封装置均为约束端密封装置；接着，将密封装置与加压系统连通，然后分别向试样S3和S3’里充水，使试样S3和S3’里均充满水并排尽空气；试样S3和S3’从开始充水到充满水的进水时间均为5min；
通过所述加压系统均匀连续的加压，直至所述试样S3和S3’失效；试样S3和S3’的加压时间均为60s；分别记录试样S3和S3’短时失效水压P0为2.509MPa，P为0.625MPa P0是P的4.0144倍，该倍数与比例因子4相差比例因子的0.36％，差异小于1％。
实施例4
待测竹复合压力管G4公称直径DN为1000mm，压力等级为1.2MPa，测得其环刚度为13124N/m2，将G4作为试样S4。另外，选取管G4的竹复合压力管缩比管G4’，缩比比例为3：1(即比例因子λ＝DN:DN’＝3)，G4与G4’两者的公称直径、压力等级、环刚度比值均为3，将G4’作为试样S4’；
将S4和S4’在25℃的空气环境中放置16h，然后分别在试样S4和S4’的两端卡上密封装置，支撑所述密封装置使试样S4和S4’均处于水平状态，所述密封装置均为约束端密封装置；接着，将密封装置与加压系统连通，然后分别向试样S4和S4’里充水，使试样S4和S4’里均充满水并排尽空气；试样S4和S4’从开始充水到充满水的进水时间均为3min；
通过所述加压系统均匀连续的加压，直至所述试样S4和S4’失效；试样S4和S4’的加压时间均为60s；分别记录试样S4和S4’短时失效水压P0为5.136MPa，P为1.708MPa两者比值为3.007，与比例因子3相差比例因子的0.23％，差异小于1％。
实施例5
待测竹复合压力管G5公称直径DN为1800mm，压力等级为0.4MPa，测得其环刚度为6173N/m2，将G5作为试样S5。另外，选取管G5的竹复合压力管缩比管G5’，G5’管缩比比例为6：1(即比例因子λ＝DN:DN’＝6)，G5与G5’两者的公称直径、压力等级、环刚度比值均为6，将G5’作为试样S5’；
将S5和S5’在25℃的空气环境中放置20h，然后分别在试样S5和S5’的两端卡上密封装置，所述密封装置均为约束端密封装置；接着，将密封装置与加压系统连通，分别向试样S5和S5’里充水，使试样S5和S5’里均充满水、排尽空气，并且支撑所述密封装置使试样S5和S5’均处于水平状态；试样S5和S5’从开始充水到充满水的进水时间均为5min。
然后，通过所述加压系统均匀连续的加压，直至所述试样S5和S5’失 效；试样S5和S5’的加压时间均为70s；分别记录试样S5和S5’短时失效水压P0为1.748MPa，P为0.289MPa，两者比值为6.048，与比例因子6相差比例因子的0.8％，差异小于1％。
上述实施例中，作为与待测竹复合压力管对应的竹复合压力管缩比管，除了公称直径需要满足要求外，缩比管的环刚度也需满足要求。例如，竹复合压力管(包括待测竹复合压力管和竹复合压力管缩比管)它们的环刚度可按以下方法检测：
测试设备、测试环境及试样按照GB/T 5352的规定，加载速度按式(1)确定。按式(2)进行计算，取3个试样环刚度的算术平均值作为测试结果。
V＝3.5×10-4D2/t…………………(1)
式中:
V——加载速度，取整数，管径大于500mm时可修约到个位数为0或5，单位为毫米每分钟(mm/min)；
D——管的计算直径(对应外径)，单位为毫米(mm)，D＝Dn+t；
t——管壁实际测试厚度，单位为毫米(mm)；
Dn——管的内直径，单位为毫米(mm)；
S＝0.01935×F/Δy…………………(2)
式中：
S——环刚度，单位为牛每平方米(N/m2)；
Δy——管直径变化量，取试样计算直径的3％，单位为米(m)；
F——与Δy相对应的线载荷，单位为牛每米(N/m)。
当然，本发明中的缩比管也可按生产过程经验，根据缩比管的公称直径、环刚度、压力等级等要求，对缩比管的结构(如壁厚、内部铺层等)进行设计，从而直接生产出符合要求的竹复合压力管缩比管。
上述实施例中未详细说明的地方均为现有技术，可以参见例如GB/T  5351；例如，外径的测量可按GB/T 5351中的方法将外径的平均值作为外径测量的最终结果；试样管两密封段间长度等均可参照GB/T 5351中记载的方式设置。尽管根据竹复合压力管的应用条件，竹复合压力管的短时失效水压的要求可能会发明变化，但一般通过本发明检测得到的竹复合压力管短时失效水压应不小于管道压力等级的4倍，以满足管道应用中的突发例外情况。
本领域的技术人员容易理解，以上所述仅为本发明的较佳实施例而已，并不用以限制本发明，凡在本发明的精神和原则之内所作的任何修改、等同替换和改进等，均应包含在本发明的保护范围之内。

Claims (8)

  1. 一种用于确定竹复合压力管短时失效水压的检测方法，其特征在于，包括以下步骤：
    将一段竹复合压力管作为试样管，在所述试样管的两端卡上密封装置，所述密封装置为约束端密封装置；然后，将所述密封装置与加压系统连通，并向所述试样管中充水，控制水流量，使所述试样管在5min内充满水并排除空气；支撑所述密封装置使所述试样管处于水平状态；接着，通过所述加压系统对所述试样管均匀连续的加压，直至所述试样管失效，记录失效时的压力P，该压力P即为该试样管的短时失效水压。
  2. 如权利要求1所述用于确定竹复合压力管短时失效水压的检测方法，其特征在于，所述竹复合压力管试样管为待测竹复合压力管或者与该待测竹复合压力管对应的竹复合压力管缩比管，记所述待测竹复合压力管的公称直径为DN，
    当DN小于等于500mm时，则将所述待测竹复合压力管作为所述试样管，所述压力P即为该待测竹复合压力管的短时失效水压；
    当DN大于500mm时，则将所述竹复合压力管缩比管作为所述试样管；
    所述待测竹复合压力管的公称直径DN与所述竹复合压力管缩比管的公称直径DN’的比值λ满足λ＝DN:DN’＝(2～6)，所述待测竹复合压力管的环刚度与所述竹复合压力管缩比管环刚度的比值为λ；λ×P即为所述待测竹复合压力管的短时失效水压。
  3. 如权利要求2所述用于确定竹复合压力管短时失效水压的检测方法，其特征在于，所述待测竹复合压力管的压力等级与所述竹复合压力管缩比管压力等级的比值为λ。
  4. 如权利要求2所述用于确定竹复合压力管短时失效水压的检测方法，其特征在于，所述竹复合压力管缩比管的公称直径DN’不小于200mm。
  5. 如权利要求1所述用于确定竹复合压力管短时失效水压的检测方法，其特征在于，所述加压系统为电动试压泵或者带有压力调节器和液压蓄存器的氮气瓶供压系统。
  6. 如权利要求1所述用于确定竹复合压力管短时失效水压的检测方法，其特征在于，所述加压所用的加压时间为60s～70s。
  7. 如权利要求1-6任意一项所述用于确定竹复合压力管短时失效水压的检测方法，其特征在于，所述试样管在卡上所述密封装置之前，在21℃～25℃的空气环境中至少放置了16h。
  8. 如权利要求1-7任意一项所述用于确定竹复合压力管短时失效水压的检测方法，其特征在于，所述约束端密封装置采用密封塞密封时，所述密封塞与所述试样管相接触的边缘进行倒角处理。
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