Early warning, judging and detecting method for horizontal impact damage of heat supply pipeline elbow

Abstract

The invention belongs to the technical field of municipal pipeline engineering, and particularly relates to an early warning, judgment and detection method for horizontal impact damage of an urban heat supply pipeline elbow, and a sound wave detector and two displacement sensors are respectively arranged on the elbow of the pipeline; establishing a data channel between the sound wave detector and the displacement sensor and the data processor; calculating based on the initial parameter and the current parameter to obtain a rating parameter; according to the rating parameters, rating the rating parameters to obtain a plurality of grading ratings; the early warning grades of the horizontal impact damage of the heat supply pipeline elbows are divided by comprehensively analyzing the judgment standards of the three judgment bases, and the urban heat supply pipeline elbows are detected through the early warning grades. The impact influence degree of the heat supply pipeline elbow is quantified, and a grading early warning mechanism is provided, so that constructors can maintain high-risk elbows in time; and equipment cost is low, and technology landing is facilitated.

Description

Technical Field

[0001] This invention belongs to the field of municipal pipeline engineering technology, and in particular relates to a method for early warning and detection of horizontal impact damage to bends in urban heating pipelines. Background Technology

[0002] In the past, the design of bends in urban heating pipelines typically involved small-diameter, low-pressure heating pipelines. Given that the horizontal impact force on such pipeline bends is relatively small, it can be ignored during the design process.

[0003] However, with the continued acceleration of urbanization and the expansion of urban areas, traditional small-diameter heating pipelines can no longer meet the ever-increasing heating demands of cities. Against this backdrop, the application of large-diameter, high-pressure heating pipelines is becoming increasingly widespread.

[0004] Meanwhile, due to the combined effects of various factors such as temperature, internal pressure, and end resistance, heating pipe bends are subjected to significant horizontal impact forces. This impact force may damage the heating pipe bends and their systems, thereby causing serious engineering safety hazards.

[0005] Currently, existing pipeline protection schemes include various measures such as elbow buffering and impact force dispersion, but there are no research reports on early warning and detection methods for elbows in heating pipelines. Therefore, designing an early warning and detection method for horizontal impact damage to elbows in urban heating pipelines is of great practical significance. Summary of the Invention

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a method for early warning and detection of horizontal impact damage to heating pipeline elbows, the specific steps of which are as follows: Step 1: An acoustic detector and two displacement sensors are installed at the bends of the pipe. Step 2: Establish a data channel between the acoustic wave detector and the displacement sensor and the data processor. The data processor collects and stores the parameters fed back by the acoustic wave detector and the displacement sensor. Step 3: Analyze the parameters collected by the acoustic wave detector and displacement sensor using a computer, and calculate the rating parameters based on the initial and current parameters; Step 4: Based on the rating parameters obtained in Step 3, rate the rating parameters to obtain multiple grade ratings; Step 5: By comprehensively analyzing the judgment criteria of the three evaluation criteria, the warning level of horizontal impact damage to heating pipeline bends is divided, and the warning level is used to detect urban heating pipeline bends.

[0007] Furthermore, in step one, the acoustic detector is located at the center of the inner diameter of the elbow, and the two displacement sensors are located at the connection points between the elbow and the straight pipe at both ends.

[0008] Furthermore, in step three, the rating parameters include the horizontal displacement ratio μ of the pipe elbow, the angular displacement ratio η, and the inner diameter change ratio λ of the pipe elbow.

[0009] Furthermore, in step three, the horizontal displacement ratio μ of the pipe elbow is:

[0010] In the formula, L0 is the maximum allowable horizontal displacement of the pipe elbow; L1 represents the horizontal displacement of the upper side of the pipe bend; L2 is the horizontal displacement of the lower side of the pipe elbow; The angular displacement ratio η is:

[0011] In the formula, L d The perpendicular distance between the two displacement sensors; This represents the maximum permissible angular displacement of the pipe bend. The ratio λ of the change in the inner diameter of the pipe elbow is:

[0012] d1 is the inner diameter of the pipe elbow; d1 is the inner diameter of the pipe elbow after it is subjected to reciprocating impact pressure; d0 is the minimum permissible inner diameter of the pipe bend.

[0013] Furthermore, in step four, the rating is divided into three levels; The three rating levels are 60% and 80%, respectively.

[0014] Furthermore, in step five, the warning levels include Level 1, Level 2, and Level 3 warnings; A Level 1 warning requires that all three criteria for assessment must be met simultaneously according to their respective Level 1 standards. A Level II warning requires that all three assessment criteria must be met simultaneously according to their respective Level II standards, or simultaneously include both Level I and Level II standards. A Level 3 warning indicates that any one of the three assessment criteria meets the Level 3 standard.

[0015] The beneficial effects of using this invention are: Quantifying the impact of shocks on heating pipeline bends and proposing a graded early warning mechanism helps construction workers to maintain high-risk bends in a timely manner. Meanwhile, the hardware involved in this solution is a sound wave detector and a displacement sensor, which are inexpensive, facilitate technology implementation, and have low resistance to the renovation of old pipelines. Attached Figure Description

[0016] Figure 1 This is a flowchart of the present invention; Figure 2 This is a schematic diagram illustrating the operation of the pipe bend early warning detection method of the present invention; Figure 3 This is a schematic diagram of the horizontal displacement of the pipe elbow of the present invention; Figure 4 This is a schematic diagram of the angular displacement of the pipe bend in this invention; Figure 5 This is a schematic diagram illustrating the change in the inner diameter of the pipe elbow according to the present invention; The reference numerals in the attached diagram include: 1. Straight pipe; 2. Elbow; 3. Acoustic wave detector; 4. Displacement sensor; 5. Data processor; 6. Computer; Detailed Implementation

[0017] The present invention will now be described in detail with reference to the accompanying drawings.

[0018] Reference Figures 1-5 A method for early warning and detection of horizontal impact damage in heating pipeline elbows, the specific steps of which are as follows: Step 1: An acoustic detector 3 and two displacement sensors 4 are installed on the bend 2 of the pipe. Specifically, the acoustic detector 3 is located at the center of the inner diameter of the elbow 2, and the two displacement sensors 4 are located at the connection points between the elbow 2 and the straight pipe 1 at both ends.

[0019] Step 2: Establish a data channel between the acoustic wave detector 3 and the displacement sensor 4 and the data processor 5. The data processor 5 collects and stores the parameters fed back by the acoustic wave detector 3 and the displacement sensor 4. Specifically, a data channel is established using a data cable or wireless signal.

[0020] Step 3: Analyze the parameters collected by the acoustic wave detector 3 and displacement sensor 4 using computer 6, and calculate the rating parameters based on the initial and current parameters.

[0021] Specifically, considering that excessive horizontal displacement of the pipe bend caused by horizontal impact force will lead to damage to the pipe and its ancillary structures; Excessive displacement of the pipe bend angle caused by horizontal impact force will lead to pipe bending or rigid failure of the contact point between the pipe and the pipe bend. Excessive changes in the inner diameter of a pipe elbow caused by horizontal impact will lead to structural damage. Because the inner diameter of the pipe elbow is subjected to reciprocating impacts from high-temperature, high-pressure liquid, it thins, ultimately resulting in elbow failure under the combined effects of horizontal impact and pressure. Therefore, the rating parameters include the horizontal displacement ratio μ of the pipe elbow, the angular displacement ratio η, and the inner diameter change ratio λ of the pipe elbow.

[0022] in,

[0023] In the formula, L0 is the maximum allowable horizontal displacement of the pipe elbow; L1 represents the horizontal displacement of the upper side of the pipe bend; L2 is the horizontal displacement of the lower side of the pipe elbow;

[0024] In the formula, L d The distance between the two displacement sensors is 4 perpendicular lines; This represents the maximum permissible angular displacement of the pipe bend.

[0025] d1 is the inner diameter of the pipe elbow; d1 is the inner diameter of the pipe elbow after it is subjected to reciprocating impact pressure; d0 is the minimum permissible inner diameter of the pipe bend.

[0026] Step 4: Based on the rating parameters obtained in Step 3, rate the rating parameters to obtain multiple grade ratings.

[0027] The horizontal displacement ratio μ, angular displacement ratio η, and inner diameter change ratio λ of the pipe bend obtained in step three are rated. Specifically, the rating is divided into three levels; The grading thresholds for the three ratings are 60% and 80%, respectively: The first-level standard for horizontal displacement of pipe elbows is: 0 < μ ≤ 50%. The secondary standard for horizontal displacement of pipe elbows is: 50% < μ ≤ 80%. The horizontal displacement standard for pipe elbows is as follows: 80% < μ ≤ 100%; The first-class standard for bending displacement of pipe elbows is: 0 < η ≤ 60%. Secondary standard for pipe elbow bending displacement: 60% < η ≤ 80%. The standard for bending displacement of pipe elbows is as follows: 80% < η ≤ 100%; The first-level standard for the variation of the inner diameter of pipe elbows is: 0 < λ ≤ 60%. The secondary standard for the variation of the inner diameter of pipe elbows is: 60% < λ ≤ 80%. The standard for variation in the inner diameter of pipe elbows is as follows: 80% < λ ≤ 100%.

[0028] Step 5: By comprehensively analyzing the judgment criteria of the three evaluation criteria, the warning level of horizontal impact damage of heating pipeline bends is divided, and the warning level is used to detect urban heating pipeline bends. The warning levels include Level 1, Level 2, and Level 3.

[0029] Specifically, A Level 1 warning requires that all three criteria be met simultaneously; this indicates that the pipe bend is within its tolerance range and will not affect the pipeline, thus meeting normal production and living requirements.

[0030] A Level II warning requires that all three assessment criteria simultaneously meet their respective Level II standards, or simultaneously include both Level I and Level II standards. If the threshold of a Level I warning is exceeded, significant damage to the pipeline occurs, impacting pipeline bends and requiring comprehensive consideration during stress calculations. However, this does not affect normal use.

[0031] A Level 3 warning indicates that any one of the three assessment criteria has reached Level 3. This means the pipe bend has reached the point of potential damage and work should be stopped immediately for repairs to prevent a safety accident.

[0032] The above content is only a preferred embodiment of the present invention. For those skilled in the art, many changes can be made in the specific implementation and application scope based on the concept of the present invention. As long as these changes do not depart from the concept of the present invention, they all fall within the protection scope of the present invention.

Claims

1. A method for early warning and determining the horizontal impact damage of a heating pipeline elbow, characterized in that: The specific steps are as follows: Step one, the sound wave detector and two displacement sensors are arranged on the elbow of the pipeline respectively; Step two, the data channel between the sound wave detector and the displacement sensor and the data processor is established, and the data processor collects and stores the parameters fed back by the sound wave detector and the displacement sensor; Step three, the parameters collected by the sound wave detector and the displacement sensor are analyzed by the computer, and the rating parameters are calculated based on the initial parameters and the current parameters; Step four, according to the rating parameters obtained in step three, the rating parameters are rated, and a plurality of grading ratings are obtained; Step five, the horizontal impact damage early warning level of the heating pipeline elbow is divided by comprehensively analyzing the judgment standards of the three evaluation bases, and the detection of the city heating pipeline elbow is realized through the early warning level.

2. The method for early warning and judging of horizontal impact damage of a heating pipeline elbow according to claim 1, characterized in that: In step one, the sound wave detector is located at the center of the inner diameter of the elbow, and the two displacement sensors are respectively located at the connection between the elbow and the straight pipe.

3. The method for early warning and judging of horizontal impact damage of a heating pipeline elbow according to claim 1, characterized in that: In step three, the rating parameters include the pipeline elbow horizontal displacement ratio μ, the corner displacement ratio η and the pipeline elbow inner diameter change ratio λ.

4. The method for early warning and judging of horizontal impact damage of a heating pipeline elbow according to claim 3, characterized in that: In step three, the pipeline elbow horizontal displacement ratio μ is: In the formula, L0 is the maximum allowable horizontal displacement of the pipeline elbow; L1 is the horizontal displacement of the upper side of the pipeline elbow; L2 is the horizontal displacement of the lower side of the pipeline elbow; The corner displacement ratio η is: In the formula, L d is the perpendicular distance between the two displacement sensors; is the maximum allowable angular displacement of the pipe bend; The pipeline elbow inner diameter change ratio λ is: d1 is the inner diameter of the pipeline elbow; d1 is the inner diameter of the pipeline elbow after being subjected to reciprocating impact pressure; d0 is the minimum allowable elbow inner diameter of the pipeline elbow.

5. The method for early warning and judging the horizontal impact damage of the heat supply pipeline elbow according to claim 1, characterized in that: In step four, the rating is divided into three levels; Among them, the grading nodes of the three ratings are 60% and 80% respectively.

6. The method for early warning and judging the horizontal impact damage of the heat supply pipeline elbow according to claim 1, characterized in that: In step five, the early warning levels include first level early warning, second level early warning and third level early warning; The first level early warning means that the three evaluation bases must meet the first level standard of each other at the same time; The second level early warning means that the three evaluation bases must meet the second level standard of each other at the same time, or contain the first level standard and the second level standard at the same time; The third level early warning means that any one of the three evaluation bases appears the third level standard.

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