CN110926727B - Water closing test method for plastic drainage pipeline in rural domestic sewage collection project - Google Patents
Water closing test method for plastic drainage pipeline in rural domestic sewage collection project Download PDFInfo
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
- G01M3/2807—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes
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Abstract
The invention discloses a water closing test method for a plastic drainage pipeline in rural domestic sewage collection engineering, which comprises the following steps of: checking and accepting the appearance quality of the new entering pipe; placing the pipe into a pool of a storage yard to be soaked for at least 24 hours; conveying the soaked pipe into a dry pipeline groove for installation; plugging a reserved opening of the test pipe section; calculating the height of a test water head of the test pipe section; filling water into the test pipe section to the height of the test water head, and then standing for 2 hours; observing the water level change condition in the test pipe section through a water level measuring needle, and continuously injecting water into the test pipe section to keep a constant test water head, wherein the observation time is not less than 30 min; calculating the actually measured water seepage amount, and comparing the actually measured water seepage amount with the allowable water seepage amount; and backfilling the groove after the water-closing test is qualified. The invention separates the soaking process from the testing process, and solves the potential safety hazard problem caused by the fact that the trench in the rural village road cannot be backfilled in time because a water closing test needs to be carried out after the trench is excavated.
Description
Technical Field
The invention relates to a construction project of a water supply and drainage pipeline, in particular to a water closing test method of a plastic drainage pipeline in rural domestic sewage collection project.
Background
According to the regulation of water supply and drainage construction acceptance standard (GB50268-2008), a non-pressure pipeline water closing test is required to be carried out on the gravity flow sewage collection pipe network after the pipeline is laid, so that whether the tightness of the pipeline can meet the acceptance requirement is verified. Rural sewage pipe network transformation and new construction generally adopt a plastic pipeline with a small caliber as a sewage pipe. Plastic pipelines are favored because of their advantages of low cost, light weight, easy transportation, low transportation loss, easy fabrication of small-bore pipelines, etc.
According to the standard requirements, before the water closing test, the materials need to be firstly checked and accepted, and need to be soaked for 24 hours. When rural sewage collection engineering construction is carried out, the construction method of excavation and backfilling in the same day is generally adopted in consideration of convenience of rural people in going out and safety of pedestrians and vehicles at night beside the groove.
According to the knowledge, during the construction of most rural sewage pipe networks at present, because the water closing test is limited by external construction conditions, the pipeline is not soaked after the pipeline is laid, but is directly filled with water and tested, and the measurement of water level change is tested by simple methods such as inspection well line drawing and the like, the conditions that the connection of a pipeline bell and spigot is tight and no obvious water leakage exists can be verified, the condition that whether the water seepage phenomenon or the microcosmic water leakage phenomenon exists in the pipeline can not be accurately judged, and the construction condition of the sewage pipe network cannot be truly and accurately fed back.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a water closing test method for a plastic drainage pipeline in rural domestic sewage collection engineering, which solves the problem of potential safety hazard caused by incapability of backfilling in time due to the need of a water closing test after the trench in a rural domestic sewage collection engineering is excavated.
The purpose of the invention is realized as follows: a water closing test method for a plastic drainage pipeline in rural domestic sewage collection engineering comprises the following steps:
the method comprises the following steps of firstly, checking and accepting the appearance quality of a new incoming pipe and an inspection well;
step two, placing the pipes and the inspection well into a pool of a stacking place to be soaked for at least 24 hours, wherein the water level in the pool should submerge all the pipes;
step three, the soaked pipes and the inspection well are conveyed into a dry pipeline groove of a construction area for installation;
step four, plugging the reserved opening of the test pipe section by using an inflatable rubber air bag, wherein the bearing capacity of the rubber air bag is greater than the water pressure so as to ensure that the reserved opening of the test pipe section is firmly plugged and does not seep water;
step five, calculating the height of the test water head of the test pipe section;
step six, filling water into the test pipe section to the height of the test water head, standing for 2 hours to empty the gas in the pipeline;
the well mouth of the downstream inspection well of the test pipe section is completely plugged by adopting a composite well cover, and a detection device for a water closing test is erected on the well mouth of the upstream inspection well of the test pipe section; the detection device comprises a leveling mechanism and a water level measuring needle; the leveling mechanism comprises a leveling base, a supporting platform and a level ruler; the leveling base is installed on a wellhead of the upstream inspection well; the support platform is positioned above the leveling base and connected with the leveling base through three adjusting bolts arranged in an equilateral triangle, the lower end of each adjusting bolt is rotatably embedded in an installation groove formed in the top surface of the leveling base, and the upper part of each adjusting bolt is connected with a threaded hole formed in the support platform; a through hole is coaxially formed in the center of the leveling base and the center of the supporting platform; the level ruler is arranged on the supporting platform; the water level measuring needle is inserted into the through hole of the supporting platform and the through hole of the leveling base, and is fixed on the supporting platform in a bolt connection mode; before the test, firstly supplementing water to the height of a test water head in an upstream inspection well, then installing a detection device, adjusting the needle point of a water level measuring needle to just contact with the water surface in the upstream inspection well, then starting timing, observing the water level change condition in the upstream inspection well, wherein the observation time is not less than 30min, and if the water level is reduced, timely supplementing water to the upstream inspection well 3 by adopting a measuring cylinder so as to keep the test water head constant;
step eight, after the observation is finished, calculating the water replenishing amount to the test pipe section in the test process, actually measuring the observation time of water seepage and the length of the test pipe section, calculating the actually measured water seepage amount, comparing the actually measured water seepage amount with the allowable water seepage amount, and judging whether the water seepage amount of the test pipe section meets the standard requirement; if the water-closing test result is qualified, the operation goes to the ninth step; if the water-closing test result is unqualified, returning to the third procedure, and entering the ninth procedure after the test is qualified;
and step nine, backfilling the groove after the water closing test is qualified.
According to the water closing test method for the plastic drainage pipeline in the rural domestic sewage collection project, during the process, every batch of incoming pipe materials are randomly checked, the inner surface and the outer surface of each pipe material are smooth and flat, have no bubbles, no pits, no obvious impurities and irregular ripples, notches at two ends of each pipe material are flat and perpendicular to the axis of the pipe, and no separation phenomenon of a fusion seam exists; after the checking is finished, a plurality of pipes are randomly extracted and sent to a third-party detection unit for physical and mechanical property detection, and the next procedure can be carried out only after the detection is qualified.
According to the water closing test method for the plastic drainage pipeline in the rural domestic sewage collection project, when the pipeline in the third process is installed, the sealing ring is buckled on the second corrugated groove in the socket section of the pipeline in the bell socket; when the inflatable rubber air bag is used for plugging the reserved opening of the test pipe section, the portable inflator is firstly adopted to inflate the rubber air bag to be half full, the rubber air bag is placed at the reserved opening to be plugged, the portable inflator is used to inflate the rubber air bag to completely plug the reserved opening, and the bearing capacity of the plugging air bag is greater than the water pressure so as to ensure that the reserved opening is plugged firmly and does not seep water.
The water closing test method of the plastic drainage pipeline in the rural domestic sewage collection project has the following characteristics: the soaking process of the pipeline water-closing test is separated from the testing process, so that the problem of potential safety hazard caused by incapability of timely backfilling due to the fact that the water-closing test needs to be carried out after the trench in the rural village road is excavated can be solved while the accurate and reliable water-closing test result is ensured, the difficulty of project safety management is greatly reduced, meanwhile, the 24-hour soaking process of the pipe does not need to be carried out in the trench, the unfinished time period is greatly utilized, the construction period is greatly shortened, and the engineering construction efficiency is improved.
Drawings
FIG. 1 is a flow chart of a water shut-off test method of the present invention;
FIG. 2 is a diagram showing a water shut-off test method according to the present invention in a seventh step;
fig. 3 is a schematic structural view of a detection device used in the water shut-off test method of the present invention.
Detailed Description
The invention will be further explained with reference to the drawings.
Referring to fig. 1 to 3, the method for testing the water closing of the plastic drainage pipeline in the rural domestic sewage collection project of the present invention comprises the following steps:
the method comprises the following steps of firstly, checking and accepting the appearance quality of a new incoming pipe and an inspection well; randomly spot-checking each batch of approach pipes and inspection wells, wherein the inner and outer surfaces of the pipes and the inspection wells are smooth and flat, have no bubbles, no pits, no obvious impurities and irregular ripples, notches at two ends of the pipes are flat and vertical to the axis of the pipes, and a fusion seam has no separation phenomenon; after the inspection is finished, randomly extracting a plurality of pipes and sending the pipes to a third-party detection unit for physical and mechanical property detection, and entering the next procedure after the detection is qualified;
step two, stacking the qualified pipes and inspection wells in a field with a flat ground and a sun-shading condition, protecting the pipes and the inspection wells, and simultaneously placing the pipes and the inspection wells required by daily construction in a temporarily built water pool according to a daily construction plan for soaking for at least 24 hours to require that the water level in the water pool submerges all the pipes;
step three, the soaked pipes and the inspection well are conveyed to a construction area, the pipes and the inspection well are lightly taken and placed in the conveying process, and two persons need to respectively surround one end of the same pipe and walk back and forth when the plastic drainage pipe is conveyed; the pipe and the inspection well are conveyed to a position which is 0.8m close to the edge of the groove and placed, and the place needs to be leveled without broken stones, sharp objects and the like; before the pipe is placed at the bottom of the groove, the bottom of the groove is kept dry without accumulated water, and the bearing capacity of the foundation at the bottom of the groove meets the design requirement; after the procedures of laying and tamping the medium and coarse sand cushion layers at the bottom of the groove are finished, the pipeline can be hoisted, the pipe and the inspection well are hoisted to the cushion layer at the bottom of the groove by adopting a crane or an excavator and are positioned at the axis position in the groove, the pipe and the inspection well cannot be directly pushed into the groove, and the pipe is prevented from being collided, broken and the like; when the pipeline is in spigot-and-socket connection, sundries on the sealing ring are cleaned, non-oily lubricant is uniformly coated on the sealing ring, then the sealing ring is arranged in the spigot-and-socket opening of the inspection well, and the sealing ring is pressed once along the whole sealing ring by hand, so that all parts of the sealing ring are ensured not to warp and twist and are uniformly and uniformly clamped in the spigot-and-socket opening; buckling the sealing ring in a second corrugated groove of the pipeline socket section in the bell socket;
step four, after the pipeline is installed, plugging a reserved opening of the test pipe section 1 by using an inflatable rubber air bag 10; firstly, a portable inflator is adopted to inflate the rubber air bag 10 to be half full, the rubber air bag 10 is placed at a reserved opening to be blocked, the portable inflator is used to inflate the rubber air bag 10 to completely block the reserved opening, so that the bearing capacity of the rubber air bag 10 is greater than the water pressure, and the reserved opening is firmly blocked and is not seeped;
step five, calculating the height of the test water head of the test pipe section;
the test head of the test pipe section should comply with the following regulations:
(1) when the designed water head (the designed water head is equal to the height of the bottom of the pipe and is plus 0.55 multiplied by the inner diameter of the pipeline) at the upstream of the test section does not exceed the height of the inner wall at the top of the pipe, the test water head is calculated by adding 2m to the inner wall at the top of the pipe at the upstream of the test section;
(2) when the designed water head (the designed water head is equal to the height of the bottom of the pipe plus 0.55 multiplied by the inner diameter of the pipeline) at the upstream of the test section exceeds the height of the inner wall of the top of the pipe, the test water head is calculated by adding 2m to the designed water head;
(3) when the calculated test water head is less than 10m and exceeds the wellhead of the upstream inspection well, the height of the wellhead of the upstream inspection well is measured;
step six, slowly filling water into the test pipe section to the height of the test water head, standing for 2 hours to evacuate gas in the test pipe section, and ensuring the accuracy of a water level observation result;
the seventh procedure, firstly, plugging the well mouth of the downstream inspection well 2 of the test pipe section 1 by adopting the composite well cover 20, and setting up a detection device for the water-closing test on the well mouth of the upstream inspection well 3 of the test pipe section 1; the detection device comprises a leveling mechanism and a water level measuring probe 44, wherein the leveling mechanism comprises a leveling base 41, a supporting platform 42 and a level ruler 43; the leveling base 41 is installed on the wellhead of the upstream inspection well 3; the supporting platform 42 is positioned above the leveling base 41 and connected with the leveling base 41 through three adjusting bolts 40 which are arranged in an equilateral triangle, the lower end of each adjusting bolt 40 is rotatably embedded in an installation groove formed in the top surface of the leveling base 41, and the upper part of each adjusting bolt 40 is connected with a threaded hole formed in the supporting platform 42; a through hole is coaxially formed in the center of the leveling base 41 and the center of the supporting platform 42; level 43 is permanently mounted on support platform 42; the water level measuring needle 44 is inserted into the through hole of the supporting platform 42 and the through hole of the leveling base 41, and the water level measuring needle 44 is fixed on the supporting platform 42 in a bolt connection mode; before the test, firstly supplementing water to the upstream inspection well 3 to the height of a test water head, then installing a detection device, adjusting a supporting platform 42 to be horizontal by an adjusting bolt 40 on a leveling mechanism and observing bubbles on a leveling ruler 43, then adjusting the needle point of a water level measuring needle 44 to just contact with the water surface in the upstream inspection well 3, starting timing, observing the water surface height every 10 minutes, wherein the observation time is not less than 30min, namely, three times of observation are needed; if the water level is reduced, a measuring cylinder is adopted to supplement water into the upstream inspection well 3 in time so as to keep the test water head constant (see figure 2);
step eight, after the observation is finished, calculating the water replenishing quantity W in the test pipe section, the observation time T of actually measured water seepage and the length L of the test pipe section in the test process, and then calculating the actually measured water seepage according to the formula (1):
q＝W/T×L (1)
in equation (1): q is the measured water seepage amount L/(min m); w is the water supplement amount L; t is the observation time min of actually measured water seepage; l is the length m of the test pipe section;
comparing the water seepage quantity with the allowable water seepage quantity, and judging whether the water seepage quantity of the test pipe section meets the standard requirement or not;
the allowable water seepage amount is calculated according to the formula (2):
Q＝0.0046Di (2)
in equation (2): q is the allowable water seepage amount of m/24 h.km; di is the inner diameter mm of the pipeline;
if the water-closing test result is qualified, the operation goes to the ninth step; if the water-closing test result is unqualified, returning to the third procedure, and rechecking the pipe and the connecting port; if the water seepage test is unqualified due to the untight connection port of the pipeline, the pipeline is reconnected; if the water closing test result is unqualified due to the pipe, the soaked pipe is conveyed again for connection and test, and the process is carried out to the ninth step after the test is qualified;
and step nine, backfilling the groove after the water closing test is qualified.
The water-closing test method provided by the invention has the advantages that the water-closing test difficulty under the characteristics of the working conditions of excavation and backfilling of the same day in the construction of rural sewage collection engineering on the same day of the groove is solved while the water-closing property of the rural gravity flow type sewage collection pipe network pipeline is verified, in the whole test process, the safety of the test working condition and the accuracy of the test are taken as starting points, the principles of safety, high efficiency, economy and environmental protection are inherited, the smooth operation of the water-closing test of the sewage collection pipe network pipeline is ensured, and the safety protection problem of pedestrians and travelling vehicles on rural roads at night when the pedestrians pass by the side of the groove is solved; meanwhile, the construction mode of separating the pipeline soaking process from the pipeline testing process greatly shortens the construction period, improves the engineering efficiency and simultaneously ensures the construction safety.
The above embodiments are provided only for illustrating the present invention and not for limiting the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and therefore all equivalent technical solutions should also fall within the scope of the present invention, and should be defined by the claims.
Claims (1)
1. A water closing test method for a plastic drainage pipeline in rural domestic sewage collection engineering is characterized by comprising the following steps:
the method comprises the following steps of firstly, checking and accepting the appearance quality of a new incoming pipe and an inspection well; randomly spot-checking each batch of approach pipes and inspection wells, wherein the inner and outer surfaces of the pipes and the inspection wells are smooth and flat, have no bubbles, no pits, no obvious impurities and irregular ripples, notches at two ends of the pipes are flat and vertical to the axis of the pipes, and a fusion seam has no separation phenomenon; after the inspection is finished, randomly extracting a plurality of pipes and sending the pipes to a third-party detection unit for physical and mechanical property detection, and entering the next procedure after the detection is qualified;
step two, placing the pipes and the inspection well into a pool of a stacking place to be soaked for at least 24 hours, wherein the water level in the pool should submerge all the pipes;
step three, the soaked pipes and the inspection well are conveyed into a dry pipeline groove of a construction area for installation; when the pipeline is in socket connection, the sealing ring is buckled on a second corrugated groove positioned on the pipeline socket section in the socket;
step four, plugging the reserved opening of the test pipe section by using an inflatable rubber air bag, firstly, inflating the rubber air bag to be half full by using a portable inflator, placing the rubber air bag at the reserved opening to be plugged, then inflating the rubber air bag by using the portable inflator until the reserved opening is completely plugged, wherein the bearing capacity of the rubber air bag is greater than the water pressure so as to ensure that the reserved opening of the test pipe section is firmly plugged and does not seep water;
step five, calculating the height of the test water head of the test pipe section;
step six, filling water into the test pipe section to the height of the test water head, standing for 2 hours to empty the gas in the pipeline;
the well mouth of the downstream inspection well of the test pipe section is completely plugged by adopting a composite well cover, and a detection device for a water closing test is erected on the well mouth of the upstream inspection well of the test pipe section; the detection device comprises a leveling mechanism and a water level measuring needle; the leveling mechanism comprises a leveling base, a supporting platform and a level ruler; the leveling base is installed on a wellhead of the upstream inspection well; the support platform is positioned above the leveling base and connected with the leveling base through three adjusting bolts arranged in an equilateral triangle, the lower end of each adjusting bolt is rotatably embedded in an installation groove formed in the top surface of the leveling base, and the upper part of each adjusting bolt is connected with a threaded hole formed in the support platform; a through hole is coaxially formed in the center of the leveling base and the center of the supporting platform; the level ruler is arranged on the supporting platform; the water level measuring needle is inserted into the through hole of the supporting platform and the through hole of the leveling base, and is fixed on the supporting platform in a bolt connection mode; before the test, firstly supplementing water to the upstream inspection well to the height of the test water head, then installing a detection device, adjusting the needle point of a water level measuring needle to just contact with the water surface in the upstream inspection well, then starting timing, observing the water level change condition in the upstream inspection well, wherein the observation time is not less than 30min, and if the water level is reduced, timely supplementing water to the upstream inspection well (3) by adopting a measuring cylinder so as to keep the test water head constant;
step eight, after the observation is finished, calculating the water replenishing amount to the test pipe section in the test process, actually measuring the observation time of water seepage and the length of the test pipe section, calculating the actually measured water seepage amount, comparing the actually measured water seepage amount with the allowable water seepage amount, and judging whether the water seepage amount of the test pipe section meets the standard requirement; if the water-closing test result is qualified, the operation goes to the ninth step; if the water-closing test result is unqualified, returning to the third procedure, and entering the ninth procedure after the test is qualified;
and step nine, backfilling the groove after the water closing test is qualified.
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| CN114199476A (en) * | 2020-09-17 | 2022-03-18 | 中国电建集团华东勘测设计研究院有限公司 | Rapid plugging digitalization device for non-pressure pipeline water closing test and test method |
| CN113624420A (en) * | 2021-08-11 | 2021-11-09 | 中建八局第四建设有限公司 | Automatic detection device and method for water closing test of non-pressure pipeline |
| CN113668613A (en) * | 2021-08-27 | 2021-11-19 | 中国江苏国际经济技术合作集团有限公司 | Application of GRP sewage well in ultra-deep sewage pipeline system |
| CN116678802B (en) * | 2023-08-03 | 2023-11-14 | 常州市建筑材料研究所有限公司 | Prefabricated inspection well impermeability detection device and detection method thereof |
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