CN112594970A - Quality control method in installation process of hydrothermal pump - Google Patents
Quality control method in installation process of hydrothermal pump Download PDFInfo
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- 238000003908 quality control method Methods 0.000 title claims abstract description 33
- 238000011900 installation process Methods 0.000 title claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 34
- 238000009412 basement excavation Methods 0.000 claims abstract description 32
- 238000009434 installation Methods 0.000 claims abstract description 30
- 230000008569 process Effects 0.000 claims abstract description 16
- 239000004575 stone Substances 0.000 claims abstract description 13
- 238000010276 construction Methods 0.000 claims abstract description 10
- 239000002689 soil Substances 0.000 claims abstract description 8
- 238000004904 shortening Methods 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 94
- 238000012360 testing method Methods 0.000 claims description 40
- 238000005553 drilling Methods 0.000 claims description 22
- 238000005086 pumping Methods 0.000 claims description 22
- 238000003466 welding Methods 0.000 claims description 18
- 238000007689 inspection Methods 0.000 claims description 14
- 229910000831 Steel Inorganic materials 0.000 claims description 11
- 239000010959 steel Substances 0.000 claims description 11
- 230000000694 effects Effects 0.000 claims description 10
- 230000002706 hydrostatic effect Effects 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims description 4
- 238000011049 filling Methods 0.000 claims description 4
- 238000011010 flushing procedure Methods 0.000 claims description 3
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- 229920002635 polyurethane Polymers 0.000 claims description 3
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- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
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- 230000005465 channeling Effects 0.000 claims description 2
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- 238000010438 heat treatment Methods 0.000 description 6
- 239000010410 layer Substances 0.000 description 6
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- 238000005057 refrigeration Methods 0.000 description 4
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/02—Heat pumps of the compression type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/06—Heat pumps characterised by the source of low potential heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
Abstract
The invention provides a quality control method in a hydrothermal pump installation process, which comprises the following steps: step one, controlling the quality of the installation of an outdoor pipe ditch system, wherein the step comprises (1) pipe ditch excavation, the pipe ditch excavation comprises accurately paying off according to point positions given by a drawing, and paying off excavation is carried out according to the width of the pipe ditch strictly in the excavation process, so that an enough working surface is ensured when a pipeline is installed; mainly uses mechanical excavation as a main part and manual excavation as an auxiliary part, strictly controls the elevation of the bottom of the pipe groove, and if the ultra-excavation needs to be replaced by broken stones or plain soil, the original soil cannot be replaced. In rainy season, the method of shortening the grooving length as much as possible is adopted during excavation, and fast excavation, fast grooving and fast backfilling are achieved as much as possible. The invention aims to standardize the reasonable sequence and quality control in the installation process of the hydrothermal pump, and particularly makes corresponding adjustment on corresponding construction processes and procedures and technical defects existing in the traditional system installation, so that the installation quality is greatly improved.
Description
Technical Field
The invention belongs to the technical field of quality control, and particularly relates to a quality control method in a hydrothermal pump installation process.
Background
The water source heat pump technology is a form of ground source heat pump technology, and uses underground water which can absorb solar radiation capacity as a cold and heat source, and utilizes the principle of energy conversion to extract low-level heat energy which cannot be directly utilized in the underground water through the consumption of a small amount of high-grade electric energy and convert the low-level heat energy into usable high-level heat energy, so that the transfer of the low-level heat energy to the high-level heat energy is realized, and the purposes of heating and refrigerating buildings are achieved. In general, heat or cold of more than 4KW can be obtained by inputting 1KW energy into a water source heat pump system.
Due to the heat storage and isolation effect of the earth surface layer, the temperature of the underground water is slightly interfered by the temperature change of the surface air, and is kept in a relatively constant temperature range throughout the year. In winter, the temperature of underground water is higher than that of outdoor air, heat can be transferred into a building through a heat pump system, so that the temperature of the underground water is reduced, and cold energy stored in the ground can be used in summer; in summer, the temperature of underground water is lower than that of outdoor air, so that heat in a building can be taken away, the underground water returns to the ground through a recharging well after heat exchange is completed, redundant heat in the building is transmitted to the ground, and the ground can store the heat for use in winter. Compared with the traditional cooling unit and boiler system, the water source heat pump system has the advantages of obvious energy-saving effect, stable operation, environmental protection and no pollution.
The water source heat pump unit mainly comprises a compressor, an evaporator, a condenser, an expansion valve and the like. When heating in winter, the liquid refrigeration working medium absorbs heat through evaporation of the evaporator, so that heat stored in underground water enters the heat pump unit, the absorbed heat is promoted through compression of the compressor, the refrigeration working medium enters the condenser to be condensed into liquid after being compressed by the compressor, and the heat absorbed in the evaporator and the heat converted by acting of the compressor are released in the process of condensing the working medium, so that the purpose of heating buildings is achieved. During refrigeration in summer, working medium liquid is evaporated in the evaporator to take away heat inside the building, and the working medium is compressed by the compressor and then changed into high-temperature and high-pressure gas which is condensed in the condenser to transfer the heat to underground water. The conversion of the refrigeration or heating mode of the water source heat pump system is realized by switching the running direction of the refrigerant between the evaporator and the condenser through a four-way reversing valve. The working principle of the water source heat pump unit in winter is shown in figure 1.
The common water source heat pump systems comprise an open system and a closed system, which are distinguished according to different connection modes between a heat source well and a water source heat pump unit. The closed water source heat pump system consists of two loops, wherein the first loop is used for circulating water between a ground source side and the plate heat exchanger, the second loop is used for circulating water between the plate heat exchanger and the heat pump unit, and the connection form of the system is called as a closed system. Because underground water does not directly enter the unit, corrosive molecules in the water can be reduced by the system, the underground water is directly connected with the heat pump unit, the underground water is directly sent into the heat pump unit, and after heat exchange between the underground water and working media in the unit is completed, the underground water is re-filled to the underground through the recharging well. Compared with a closed system, the open system has a simple structure and lower equipment investment, and a plate heat exchanger is not adopted, so that the heat exchange efficiency is high. However, since the quality of the underground water is complex and unknown, the open system is prone to cause serious consequences such as corrosion and blockage, which affects the service life of the equipment.
In addition, the system can be divided into different-well recharging and same-well recharging due to different recharging forms of the underground water. The same-well recharge system means that water pumping and water returning are in the same well, but the water pumping level is different from the position of a recharge water pipe, and the position of the pipe of the pumping water pipe is lower than that of the recharge water pipe. The system has small occupied area and lower equipment investment cost. However, the pumping pipe and the return pipe are arranged in the same well, so that the phenomenon of thermal short circuit is easily caused. The different-well recharging system, namely pumping water and recharging water are respectively operated by different heat source wells. The pumping well and the recharging well are kept at a certain distance interval, and the pumping well and the recharging well can be used alternately at regular intervals. The different-well recharge system is beneficial to pumping and recharging balance of underground water, and can effectively utilize the stored energy of the underground water. Compared with a recharging system in the same well, the system has the advantages of large occupied area and high equipment investment cost.
The water source heat pump technology is used as an efficient and energy-saving renewable energy utilization technology, the theoretical knowledge and the technical level of the water source heat pump technology are very mature after long-term development, but some problems still exist in the practical application process, and the water source heat pump technology is mainly reflected in the following aspects:
lack of necessary survey analysis and inaccurate design parameters during installation
The water source heat pump system is a professional comprehensive technology and contains various disciplinary knowledge. As the hydrogeological conditions of different areas are greatly different, the hydrogeological conditions of the locations must be thoroughly investigated and researched before the project is developed, so that various conditions of water quality, pollutant content, water temperature, water quantity and the like of a water source must meet the requirements of normal operation of a water source heat pump system, field conditions around the water source must be investigated on the spot, and the influence on the arrangement of a heat source well is avoided.
The water source heat pump system is an integral body formed by a plurality of parts together, and the energy saving of the system relates to a plurality of aspects. If the water source heat pump unit can provide more energy with smaller water amount, but the installation quality control of designers is not good, the energy-saving effect of the system is reduced. In addition, due to lack of necessary exploration, adaptive analysis and demonstration schemes (installation quality control is not performed) cannot be performed according to hydrogeological conditions of projects in the design and construction stages, most of the schemes are based on personal design experiences, so that operation indexes and scheme values in actual operation have great difference and difference, and finally the system cannot normally operate, so that economic loss and energy waste are caused.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a quality control method in the installation process of a hydrothermal pump.
The invention adopts the following technical scheme:
a quality control method in the installation process of a hydrothermal pump comprises the following steps:
step one, quality control of outdoor pipe ditch system installation
The further technical proposal is that the method comprises the steps of (1) quality control of pipe groove excavation, (2) quality control of pipe installation, and (3) quality control of hydrostatic test
Wherein, the quality control of pipe chase excavation includes:
accurately paying off according to point positions given by a drawing, paying off and excavating according to the width of a pipe groove strictly in the excavating process, and ensuring that a pipeline has a sufficient working surface during installation;
mainly using mechanical excavation as a main part and using manual excavation as an auxiliary part, strictly controlling the elevation of the bottom of the pipe groove, and if the ultra-excavation needs to be replaced by using broken stones or plain soil, the original soil cannot be replaced;
in rainy season, the method of shortening the grooving length as much as possible is adopted during excavation, and fast excavation, fast grooving and fast backfilling are achieved as much as possible.
The quality control of the pipe installation comprises the following steps:
when the nominal diameter DN of the pipeline is more than or equal to 50mm, a seamless steel pipe is adopted; when the nominal diameter DN of the pipeline is less than 50mm, a welded steel pipe is adopted, and the connection modes are all welded connection;
besides appearance inspection, nondestructive inspection is carried out on the pipe orifice welding seam, and the inspection procedure and requirements are carried out according to the urban heat supply pipe network engineering construction and acceptance criteria (CJJ 28-89);
wherein the flaw detection proportion of the fixed welding seam is 10-15%, the rotating welding seam is 5%, the exploration means is an X-ray flaw detector, and the welding seam is qualified when the welding seam conforms to GB3323-87 III level.
The further technical scheme is that the pipeline corrosion prevention treatment is carried out on the welding opening after the welding is finished, and polyurethane is adopted for filling and heat preservation.
The quality control of the hydrostatic test comprises the following steps:
the outdoor pipe ditch belongs to a pressure pipeline, when the pipe is a steel pipe, the pressure in 10min under the test pressure is not more than 0.05Mpa, and then the pressure is reduced to the working pressure for inspection, the pressure is kept unchanged, and the pipeline is not leaked.
Step two, controlling the installation quality of the water taking well
The further technical scheme is that the method comprises the steps of (1) drilling, (2) pumping water, recharging test and (3) pipeline installation
Wherein, the drilling includes:
a. before drilling, the functions and the accurate positions of existing underground pipelines and underground structures in a pipe burying field are known, a pit is excavated before vertical hole drilling, the diameter of the pit is not less than 300mm, the depth is not less than 1.9mm, and finally, manual excavation is adopted for 200mm, so that the phenomenon of reworking caused by damaging possible underground pipe networks is avoided;
b. the verticality of the vertical rods in the drilling process is ensured so as to ensure that the vertical holes cannot be crossed in the construction process to cause the hole shifting phenomenon, so that a base sleeve is arranged after a pit is formed, the diameter of the sleeve is not less than 600mm, the length of the sleeve is not less than 1.5m, and inclined drilling and corresponding safety accidents caused by the disorder of the steel ropes of the drill bit due to gravity factors are avoided;
the further technical scheme is that in order to avoid collapse or hole collapse of the sandstone layer into the hole in the drilling process, a secondary sleeve is arranged after the foundation hole is formed, the diameter of the secondary sleeve is not less than 580mm, the length of the secondary sleeve is not less than 6m, slurry with corresponding consistency and the slurry surface height of the slurry inside the hole are configured according to the porosity and the water pressure of the sandstone layer in the impact process, and the slurry can be filled into the hole by means of an external water source if necessary so as to resist the water pressure and prevent the collapse of the drill hole.
c. After drilling is completed, mud in a hole is cleaned up before the well pipe is placed into the hole, the well pipe, particularly a deep well, is placed into the hole pipe in time after the mud is cleaned up, well collapse caused by long-time exposure is prevented, the connection between the well pipe and the well pipe is fully welded when the well pipe is placed into the hole pipe, a stainless steel gauze is used for wrapping the outer layer when the water filter pipe is placed into the hole pipe, and the water filtering effect is improved.
The further technical scheme is that gravel materials are applied to the periphery of the well pipe to be filled after the well pipe is placed, and the gravel materials are divided into two types: one is crushed stone and one is pea stone;
if the gravel packing is used, a water taking well is distinguished: the water filtering effect can be ensured by selecting smaller gravel, the backwater effect can be ensured by selecting larger gravel, and the pea stones do not need to be distinguished.
The further technical scheme is that the well is washed after gravel materials are filled, the well is washed upwards from the minimum surface of the well pipe according to each section of well pipe in the well washing process, then the well is washed from top to bottom, and finally back washing is carried out, so that the sediment in the well is ensured to be washed clean.
The water pumping and recharging test comprises the following steps:
a. setting a pumping well and two observation wells, recording the hydrostatic levels of the pumping well and the observation wells after the completion of the operation, then performing a pumping test, and recording data;
b. after all data are acquired, the influence radius can be calculated according to the following formula:
according to a formula that two observation holes are arranged in a water supply hydrology and geology manual (a second book), the influence radius of a confined aquifer is calculated:
wherein:
r-radius of influence (m)
S1、S2-depth of water level in observation hole (m)
r1、r2-distance (m) between the suction hole and the observation hole;
the pipe installation includes:
the required pipes are subjected to a hydraulic test before the pipes are vertically arranged, the pressure test pipeline is observed for 10 minutes under test pressure, the pressure drop is not more than 0.05Mpa, then the pressure drop is reduced to working pressure for inspection, the leakage cannot be caused, and the pressure-bearing test time of the pipeline is 60 minutes at least. The hydraulic pressure tightness test is carried out after the hydraulic pressure strength test and the pipe network flushing are qualified, the test pressure is the designed working pressure, the pressure is stabilized for 24 hours, and no leakage exists.
The further technical scheme is that the pipe should be timely discharged after the construction of the water taking well is completed, so that sediment precipitation in the hole is avoided, and the effective depth of the pipeline is reduced.
The invention has the beneficial effects that:
(1) the water source heat pump is used as a renewable resource, and the solar energy resource stored in the earth body is used as a cold and heat source, so that the technology can be recycled and changes waste into valuable;
(2) the heating efficiency of the unit can reach about 4;
(3) compared with the traditional air source heat pump system, the pollutant discharge amount of the water source heat pump can be reduced by more than 40 percent and can be reduced by more than 70 percent compared with the direct electric heating
(4) Under the same condition, the water source heat pump system can greatly reduce the maintenance cost because the mechanical moving parts are very few, and the indoor installation unit can avoid the outdoor severe weather and has long service life;
(5) the water source heat pump unit can be used for multiple purposes, not only can heat and refrigerate, but also can provide domestic hot water for living areas, and can play the roles of an air conditioner and a boiler system at the same time;
(6) the water source heat pump unit has wide application range, and is also suitable for severe cold areas and tropical areas.
Drawings
FIG. 1 is a schematic diagram of a prior art hydrothermal pump;
FIG. 2 is a schematic diagram of the steps of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention are described below clearly and completely, and it is obvious that the described embodiments are some, not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 2, the quality control method in the installation process of the hydrothermal pump of the present invention comprises the following steps:
s1. quality control of outdoor pipe ditch system installation
(1) Pipe trench excavation
Accurately paying off according to point positions given by a drawing, paying off and excavating according to the width of a pipe groove strictly in the excavating process, and ensuring that a pipeline has a sufficient working surface during installation; mainly uses mechanical excavation as a main part and manual excavation as an auxiliary part, strictly controls the elevation of the bottom of the pipe groove, and if the ultra-excavation needs to be replaced by broken stones or plain soil, the original soil cannot be replaced. In rainy season, the method of shortening the grooving length as much as possible is adopted during excavation, and fast excavation, fast grooving and fast backfilling are achieved as much as possible.
(2) Pipe installation
When the nominal diameter DN of the pipeline is more than or equal to 50mm, a seamless steel pipe is adopted; when the nominal diameter DN of the pipeline is less than 50mm, a welded steel pipe is adopted, and the connection modes are all welded connection. Besides appearance inspection, nondestructive inspection is carried out on the pipe orifice welding seam, and the inspection procedure and requirements are carried out according to the urban heat supply pipe network engineering construction and acceptance criteria (CJJ 28-89). Wherein the flaw detection proportion of the fixed welding seam is 10-15%, the rotating welding seam is 5%, the exploration means is an X-ray flaw detector, and the welding seam is qualified when the welding seam conforms to GB3323-87 III level.
And after welding, performing pipeline anticorrosion treatment on the welding opening, and filling polyurethane for heat preservation.
(3) Hydrostatic test
The outdoor pipe ditch belongs to a pressure pipeline, and is prepared according to a method shown in 9.2.5 of' construction quality acceptance criteria for water supply and drainage and heating engineering (GB 50242): when the pipe is a steel pipe, the pressure in 10min under the test pressure (1.5 times of the working pressure, but not less than 0.6MPa) is not more than 0.05MPa, and then the pressure is reduced to the working pressure for inspection, wherein the pressure is kept unchanged and the pipeline is not leak.
S2, controlling the installation quality of the water taking-back well
(1) Drilling a hole
The functions and accurate positions of existing underground pipelines and underground structures in a pipe burying field are known before drilling, a pit is excavated before vertical hole drilling, the diameter of the pit is not less than 300mm, the depth is not less than 1.9mm, and finally, manual excavation is adopted for 200mm, so that the phenomenon of reworking caused by damaging possible underground pipe networks is avoided.
The verticality of the vertical rod is ensured by drilling to ensure that each vertical hole cannot be crossed in the construction process to cause the occurrence of the hole channeling phenomenon. Therefore, after the pit is formed, the basic sleeve is arranged, the diameter of the sleeve is not less than 600mm, and the length of the sleeve is not less than 1.5m, so that inclined drilling and corresponding safety accidents caused by the fact that the steel rope of the drill bit is jumped by gravity are avoided.
In order to avoid the collapse of the sandstone layer into the hole or hole collapse in the drilling process, a secondary sleeve is arranged after the formation of the basic hole, the diameter of the secondary sleeve is not less than 580mm, the length of the secondary sleeve is not less than 6m, slurry with corresponding consistency and the slurry surface height of the slurry in the hole are configured according to the porosity, the water pressure and the like of the sandstone layer in the impact process, and the slurry can be filled into the hole by an external water source if necessary so as to resist the water pressure and prevent the collapse of the drilling hole.
After drilling is completed, the mud in the hole needs to be cleaned before the hole is placed into the well pipe, and the hole is placed into the well pipe, particularly a deep well, in time after the mud is cleaned, so that the well hole collapse caused by long-time exposure is prevented. When the water filter pipe is placed in, the outer layer of the water filter pipe is wrapped by a stainless steel gauze, so that the water filtering effect is improved.
After the well pipe is placed in the well pipe, gravel materials are applied to the periphery of the well pipe for filling, and the gravel materials are divided into two types: one is crushed stone and one is pea stone (natural mined pea stone). If the gravel packing is used, a water taking well is distinguished: the water filtering effect can be ensured by selecting smaller gravel, the backwater effect can be ensured by selecting larger gravel, and the pea stones do not need to be distinguished.
And (3) after the gravel material is filled, washing the well, wherein in the well washing process, the sand in the well is cleaned by washing upwards according to each section of well pipe from the smallest surface of the well pipe, then washing downwards from the top and finally performing back washing.
(2) Water pumping and recharging test
A pumping well and two observation wells are arranged. After the test is finished, the hydrostatic levels of the pumping well and the observation well are recorded, and then a pumping test is carried out. The record table is as follows:
recharge test, record table as follows:
after all data are acquired, the influence radius can be calculated according to the following formula:
according to a formula that two observation holes are arranged in a water supply hydrology and geology manual (a second book), the influence radius of a confined aquifer is calculated:
wherein:
r-radius of influence (m)
S1、S2-depth of water level in observation hole (m)
r1、r2Distance (m) between suction hole and observation hole
(3) Pipe installation
The required pipes are subjected to a hydraulic test before the pipes are vertically arranged, the pressure test pipeline is observed for 10 minutes under test pressure, the pressure drop is not more than 0.05Mpa, then the pressure drop is reduced to working pressure for inspection, the leakage cannot be caused, and the pressure-bearing test time of the pipeline is 60 minutes at least. The hydraulic pressure tightness test is carried out after the hydraulic pressure strength test and the pipe network flushing are qualified, the test pressure is the designed working pressure, the pressure is stabilized for 24 hours, and no leakage exists.
After the construction of the water taking well is completed, the pipe should be put down in time, so that sediment precipitation in the hole is avoided, and the effective depth of the pipeline is reduced.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A quality control method in the installation process of a hydrothermal pump is characterized by comprising the following steps:
step one, quality control of outdoor pipe ditch system installation
And step two, taking back the installation quality control of the water well.
2. The method for controlling the quality of a hydrothermal pump installation process according to claim 1, wherein the first step comprises (1) quality control of pipe groove excavation, (2) quality control of pipe installation, and (3) quality control of a hydraulic test.
3. The method of claim 1, wherein the quality control of the pipe groove excavation comprises:
a. accurately paying off according to point positions given by a drawing, paying off and excavating according to the width of a pipe groove strictly in the excavating process, and ensuring that a pipeline has a sufficient working surface during installation;
b. the mechanical excavation is mainly used, the manual excavation is assisted, the elevation of the bottom of the pipe groove is strictly controlled, and if the ultra excavation needs to be replaced by broken stones or plain soil, the original soil cannot be replaced;
c. in rainy season, the method of shortening the grooving length as much as possible is adopted during excavation, and fast excavation, fast grooving and fast backfilling are achieved as much as possible.
4. The method for quality control during installation of a hydrothermal pump according to claim 1, wherein the quality control of the pipe installation comprises:
when the nominal diameter DN of the pipeline is more than or equal to 50mm, a seamless steel pipe is adopted; when the nominal diameter DN of the pipeline is less than 50mm, a welded steel pipe is adopted, and the connection modes are all welded connection;
the pipe mouth welding line is subjected to appearance inspection and nondestructive inspection;
wherein the flaw detection proportion of the fixed welding line is 10-15%, the rotating welding line is 5%, and the exploration means is an X-ray flaw detector.
5. The quality control method in the installation process of the hydrothermal pump according to claim 1, wherein the welded joint is subjected to pipeline anticorrosion treatment after welding, and polyurethane is used for filling and heat preservation.
6. The method for controlling the quality of a hydrothermal pump during installation according to claim 1, wherein the quality control of the hydraulic test comprises: the outdoor pipe ditch belongs to a pressure pipeline, when the pipe is a steel pipe, the pressure drop in 10min under the test pressure is not more than 0.05Mpa, and then the pressure is reduced to the working pressure for inspection, the pressure is kept unchanged, and the pipeline is not leak.
7. The quality control method in the installation process of the hydrothermal pump according to claim 1, wherein the second step comprises (1) drilling, (2) pumping water and recharging tests, (3) pipeline installation
Wherein, the drilling includes:
a. the functions and the accurate positions of existing underground pipelines and underground structures in a pipe burying field are known before drilling, a pit is excavated before vertical hole drilling, the diameter of the pit is not less than 300mm, the depth is not less than 1.9mm, and finally manual excavation is adopted when 200mm is drilled;
b. the verticality of the vertical rods is ensured in the drilling process so as to ensure that the vertical holes cannot be crossed in the construction process and cause the hole channeling phenomenon, so that a base sleeve is arranged after the pit detection is formed, the diameter of the sleeve is not less than 600mm, and the length of the sleeve is not less than 1.5 m;
c. after drilling is completed, mud in a hole is cleaned up before the well pipe is placed into the hole, the well pipe, particularly a deep well, is placed into the hole pipe in time after the mud is cleaned up, well collapse caused by long-time exposure is prevented, the connection between the well pipe and the well pipe is fully welded when the well pipe is placed into the hole pipe, a stainless steel gauze is used for wrapping the outer layer when the water filter pipe is placed into the hole pipe, and the water filtering effect is improved.
8. A method of quality control during installation of a hydrothermal pump according to claim 1, wherein the well casing is completed and then packed with gravel around the well casing, the gravel being selected from two types: one is crushed stone and one is pea stone;
if the gravel packing is used, a water taking well is distinguished: the diameter of the gravel selected for the water taking well is smaller, the diameter of the gravel selected for the water returning well is larger, and the gravel selected for the water returning well does not need to be distinguished.
9. The method for controlling the quality of the hydrothermal pump in the installation process according to claim 1, wherein the water pumping and recharging test comprises the following steps:
a. setting a pumping well and two observation wells, recording the hydrostatic levels of the pumping well and the observation wells after the completion of the operation, then performing a pumping test, and recording data;
b. after all data are acquired, the influence radius can be calculated according to the following formula:
calculating the influence radius of the confined aquifer according to the two observation holes:
wherein:
r-radius of influence (m)
S1、S2-depth of water level in observation hole (m)
r1、r2-distance (m) between the suction hole and the observation hole.
10. The method of quality control during hydrothermal pump installation of claim 1, wherein the piping installation comprises: the method comprises the steps of carrying out a hydraulic pressure test on a required pipe before vertically lowering the pipe, observing a pressure test pipeline for 10 minutes under test pressure, wherein the pressure drop is not more than 0.05Mpa, then lowering the pressure to working pressure for inspection, and the pressure test is carried out without leakage, wherein the pressure bearing test time of the pipeline is at least 60 minutes, the hydraulic pressure tightness test is carried out after the hydraulic pressure strength test and the pipe network flushing are qualified, the test pressure is the designed working pressure, the pressure is stabilized for 24 hours, and no leakage exists.
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